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| <span id="513">513</span> |
| <span id="514">514</span> |
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| <span id="532">532</span> |
| <span id="533">533</span> |
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| <span id="536">536</span> |
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| <span id="539">539</span> |
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| <span id="541">541</span> |
| <span id="542">542</span> |
| <span id="543">543</span> |
| <span id="544">544</span> |
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| <span id="556">556</span> |
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| <span id="558">558</span> |
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| <span id="570">570</span> |
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| <span id="584">584</span> |
| <span id="585">585</span> |
| <span id="586">586</span> |
| </pre><pre class="rust"><code><span class="comment">// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT</span> |
| <span class="comment">// file at the top-level directory of this distribution and at</span> |
| <span class="comment">// http://rust-lang.org/COPYRIGHT.</span> |
| <span class="comment">//</span> |
| <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> |
| <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> |
| <span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span> |
| <span class="comment">// option. This file may not be copied, modified, or distributed</span> |
| <span class="comment">// except according to those terms.</span> |
| |
| <span class="doccomment">//! Numeric traits for generic mathematics</span> |
| <span class="doccomment">//!</span> |
| <span class="doccomment">//! ## Compatibility</span> |
| <span class="doccomment">//!</span> |
| <span class="doccomment">//! The `num-traits` crate is tested for rustc 1.8 and greater.</span> |
| |
| <span class="attribute">#![<span class="ident">doc</span>(<span class="ident">html_root_url</span> <span class="op">=</span> <span class="string">"https://docs.rs/num-traits/0.2"</span>)]</span> |
| <span class="attribute">#![<span class="ident">deny</span>(<span class="ident">unconditional_recursion</span>)]</span> |
| <span class="attribute">#![<span class="ident">no_std</span>]</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>)]</span> |
| <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">std</span>; |
| |
| <span class="comment">// Only `no_std` builds actually use `libm`.</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>), <span class="ident">feature</span> <span class="op">=</span> <span class="string">"libm"</span>))]</span> |
| <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">libm</span>; |
| |
| <span class="kw">use</span> <span class="ident">core::fmt</span>; |
| <span class="kw">use</span> <span class="ident">core::num::Wrapping</span>; |
| <span class="kw">use</span> <span class="ident">core::ops</span>::{<span class="ident">Add</span>, <span class="ident">Div</span>, <span class="ident">Mul</span>, <span class="ident">Rem</span>, <span class="ident">Sub</span>}; |
| <span class="kw">use</span> <span class="ident">core::ops</span>::{<span class="ident">AddAssign</span>, <span class="ident">DivAssign</span>, <span class="ident">MulAssign</span>, <span class="ident">RemAssign</span>, <span class="ident">SubAssign</span>}; |
| |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">bounds::Bounded</span>; |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"libm"</span>))]</span> |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">float::Float</span>; |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">float::FloatConst</span>; |
| <span class="comment">// pub use real::{FloatCore, Real}; // NOTE: Don't do this, it breaks `use num_traits::*;`.</span> |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">cast</span>::{<span class="ident">cast</span>, <span class="ident">AsPrimitive</span>, <span class="ident">FromPrimitive</span>, <span class="ident">NumCast</span>, <span class="ident">ToPrimitive</span>}; |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">identities</span>::{<span class="ident">one</span>, <span class="ident">zero</span>, <span class="ident">One</span>, <span class="ident">Zero</span>}; |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">int::PrimInt</span>; |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">ops::checked</span>::{ |
| <span class="ident">CheckedAdd</span>, <span class="ident">CheckedDiv</span>, <span class="ident">CheckedMul</span>, <span class="ident">CheckedNeg</span>, <span class="ident">CheckedRem</span>, <span class="ident">CheckedShl</span>, <span class="ident">CheckedShr</span>, <span class="ident">CheckedSub</span>, |
| }; |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">ops::inv::Inv</span>; |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">ops::mul_add</span>::{<span class="ident">MulAdd</span>, <span class="ident">MulAddAssign</span>}; |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">ops::saturating</span>::{<span class="ident">Saturating</span>, <span class="ident">SaturatingAdd</span>, <span class="ident">SaturatingMul</span>, <span class="ident">SaturatingSub</span>}; |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">ops::wrapping</span>::{ |
| <span class="ident">WrappingAdd</span>, <span class="ident">WrappingMul</span>, <span class="ident">WrappingNeg</span>, <span class="ident">WrappingShl</span>, <span class="ident">WrappingShr</span>, <span class="ident">WrappingSub</span>, |
| }; |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">pow</span>::{<span class="ident">checked_pow</span>, <span class="ident">pow</span>, <span class="ident">Pow</span>}; |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">sign</span>::{<span class="ident">abs</span>, <span class="ident">abs_sub</span>, <span class="ident">signum</span>, <span class="ident">Signed</span>, <span class="ident">Unsigned</span>}; |
| |
| <span class="attribute">#[<span class="ident">macro_use</span>]</span> |
| <span class="kw">mod</span> <span class="ident">macros</span>; |
| |
| <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">bounds</span>; |
| <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">cast</span>; |
| <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">float</span>; |
| <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">identities</span>; |
| <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">int</span>; |
| <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">ops</span>; |
| <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">pow</span>; |
| <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">real</span>; |
| <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">sign</span>; |
| |
| <span class="doccomment">/// The base trait for numeric types, covering `0` and `1` values,</span> |
| <span class="doccomment">/// comparisons, basic numeric operations, and string conversion.</span> |
| <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Num</span>: <span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">Zero</span> <span class="op">+</span> <span class="ident">One</span> <span class="op">+</span> <span class="ident">NumOps</span> { |
| <span class="kw">type</span> <span class="ident">FromStrRadixErr</span>; |
| |
| <span class="doccomment">/// Convert from a string and radix (typically `2..=36`).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Examples</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```rust</span> |
| <span class="doccomment">/// use num_traits::Num;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// let result = <i32 as Num>::from_str_radix("27", 10);</span> |
| <span class="doccomment">/// assert_eq!(result, Ok(27));</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// let result = <i32 as Num>::from_str_radix("foo", 10);</span> |
| <span class="doccomment">/// assert!(result.is_err());</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Supported radices</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The exact range of supported radices is at the discretion of each type implementation. For</span> |
| <span class="doccomment">/// primitive integers, this is implemented by the inherent `from_str_radix` methods in the</span> |
| <span class="doccomment">/// standard library, which **panic** if the radix is not in the range from 2 to 36. The</span> |
| <span class="doccomment">/// implementation in this crate for primitive floats is similar.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// For third-party types, it is suggested that implementations should follow suit and at least</span> |
| <span class="doccomment">/// accept `2..=36` without panicking, but an `Err` may be returned for any unsupported radix.</span> |
| <span class="doccomment">/// It's possible that a type might not even support the common radix 10, nor any, if string</span> |
| <span class="doccomment">/// parsing doesn't make sense for that type.</span> |
| <span class="kw">fn</span> <span class="ident">from_str_radix</span>(<span class="ident">str</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">radix</span>: <span class="ident">u32</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>, <span class="ident"><span class="self">Self</span>::FromStrRadixErr</span><span class="op">></span>; |
| } |
| |
| <span class="doccomment">/// The trait for types implementing basic numeric operations</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This is automatically implemented for types which implement the operators.</span> |
| <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">NumOps</span><span class="op"><</span><span class="ident">Rhs</span> <span class="op">=</span> <span class="self">Self</span>, <span class="ident">Output</span> <span class="op">=</span> <span class="self">Self</span><span class="op">></span>: |
| <span class="ident">Add</span><span class="op"><</span><span class="ident">Rhs</span>, <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Output</span><span class="op">></span> |
| <span class="op">+</span> <span class="ident">Sub</span><span class="op"><</span><span class="ident">Rhs</span>, <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Output</span><span class="op">></span> |
| <span class="op">+</span> <span class="ident">Mul</span><span class="op"><</span><span class="ident">Rhs</span>, <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Output</span><span class="op">></span> |
| <span class="op">+</span> <span class="ident">Div</span><span class="op"><</span><span class="ident">Rhs</span>, <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Output</span><span class="op">></span> |
| <span class="op">+</span> <span class="ident">Rem</span><span class="op"><</span><span class="ident">Rhs</span>, <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Output</span><span class="op">></span> |
| { |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">Rhs</span>, <span class="ident">Output</span><span class="op">></span> <span class="ident">NumOps</span><span class="op"><</span><span class="ident">Rhs</span>, <span class="ident">Output</span><span class="op">></span> <span class="kw">for</span> <span class="ident">T</span> <span class="kw">where</span> |
| <span class="ident">T</span>: <span class="ident">Add</span><span class="op"><</span><span class="ident">Rhs</span>, <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Output</span><span class="op">></span> |
| <span class="op">+</span> <span class="ident">Sub</span><span class="op"><</span><span class="ident">Rhs</span>, <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Output</span><span class="op">></span> |
| <span class="op">+</span> <span class="ident">Mul</span><span class="op"><</span><span class="ident">Rhs</span>, <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Output</span><span class="op">></span> |
| <span class="op">+</span> <span class="ident">Div</span><span class="op"><</span><span class="ident">Rhs</span>, <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Output</span><span class="op">></span> |
| <span class="op">+</span> <span class="ident">Rem</span><span class="op"><</span><span class="ident">Rhs</span>, <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Output</span><span class="op">></span> |
| { |
| } |
| |
| <span class="doccomment">/// The trait for `Num` types which also implement numeric operations taking</span> |
| <span class="doccomment">/// the second operand by reference.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This is automatically implemented for types which implement the operators.</span> |
| <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">NumRef</span>: <span class="ident">Num</span> <span class="op">+</span> <span class="kw">for</span><span class="op"><</span><span class="lifetime">'r</span><span class="op">></span> <span class="ident">NumOps</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'r</span> <span class="self">Self</span><span class="op">></span> {} |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">NumRef</span> <span class="kw">for</span> <span class="ident">T</span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Num</span> <span class="op">+</span> <span class="kw">for</span><span class="op"><</span><span class="lifetime">'r</span><span class="op">></span> <span class="ident">NumOps</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'r</span> <span class="ident">T</span><span class="op">></span> {} |
| |
| <span class="doccomment">/// The trait for references which implement numeric operations, taking the</span> |
| <span class="doccomment">/// second operand either by value or by reference.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This is automatically implemented for types which implement the operators.</span> |
| <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">RefNum</span><span class="op"><</span><span class="ident">Base</span><span class="op">></span>: <span class="ident">NumOps</span><span class="op"><</span><span class="ident">Base</span>, <span class="ident">Base</span><span class="op">></span> <span class="op">+</span> <span class="kw">for</span><span class="op"><</span><span class="lifetime">'r</span><span class="op">></span> <span class="ident">NumOps</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'r</span> <span class="ident">Base</span>, <span class="ident">Base</span><span class="op">></span> {} |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">Base</span><span class="op">></span> <span class="ident">RefNum</span><span class="op"><</span><span class="ident">Base</span><span class="op">></span> <span class="kw">for</span> <span class="ident">T</span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">NumOps</span><span class="op"><</span><span class="ident">Base</span>, <span class="ident">Base</span><span class="op">></span> <span class="op">+</span> <span class="kw">for</span><span class="op"><</span><span class="lifetime">'r</span><span class="op">></span> <span class="ident">NumOps</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'r</span> <span class="ident">Base</span>, <span class="ident">Base</span><span class="op">></span> {} |
| |
| <span class="doccomment">/// The trait for types implementing numeric assignment operators (like `+=`).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This is automatically implemented for types which implement the operators.</span> |
| <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">NumAssignOps</span><span class="op"><</span><span class="ident">Rhs</span> <span class="op">=</span> <span class="self">Self</span><span class="op">></span>: |
| <span class="ident">AddAssign</span><span class="op"><</span><span class="ident">Rhs</span><span class="op">></span> <span class="op">+</span> <span class="ident">SubAssign</span><span class="op"><</span><span class="ident">Rhs</span><span class="op">></span> <span class="op">+</span> <span class="ident">MulAssign</span><span class="op"><</span><span class="ident">Rhs</span><span class="op">></span> <span class="op">+</span> <span class="ident">DivAssign</span><span class="op"><</span><span class="ident">Rhs</span><span class="op">></span> <span class="op">+</span> <span class="ident">RemAssign</span><span class="op"><</span><span class="ident">Rhs</span><span class="op">></span> |
| { |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">Rhs</span><span class="op">></span> <span class="ident">NumAssignOps</span><span class="op"><</span><span class="ident">Rhs</span><span class="op">></span> <span class="kw">for</span> <span class="ident">T</span> <span class="kw">where</span> |
| <span class="ident">T</span>: <span class="ident">AddAssign</span><span class="op"><</span><span class="ident">Rhs</span><span class="op">></span> <span class="op">+</span> <span class="ident">SubAssign</span><span class="op"><</span><span class="ident">Rhs</span><span class="op">></span> <span class="op">+</span> <span class="ident">MulAssign</span><span class="op"><</span><span class="ident">Rhs</span><span class="op">></span> <span class="op">+</span> <span class="ident">DivAssign</span><span class="op"><</span><span class="ident">Rhs</span><span class="op">></span> <span class="op">+</span> <span class="ident">RemAssign</span><span class="op"><</span><span class="ident">Rhs</span><span class="op">></span> |
| { |
| } |
| |
| <span class="doccomment">/// The trait for `Num` types which also implement assignment operators.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This is automatically implemented for types which implement the operators.</span> |
| <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">NumAssign</span>: <span class="ident">Num</span> <span class="op">+</span> <span class="ident">NumAssignOps</span> {} |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">NumAssign</span> <span class="kw">for</span> <span class="ident">T</span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Num</span> <span class="op">+</span> <span class="ident">NumAssignOps</span> {} |
| |
| <span class="doccomment">/// The trait for `NumAssign` types which also implement assignment operations</span> |
| <span class="doccomment">/// taking the second operand by reference.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This is automatically implemented for types which implement the operators.</span> |
| <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">NumAssignRef</span>: <span class="ident">NumAssign</span> <span class="op">+</span> <span class="kw">for</span><span class="op"><</span><span class="lifetime">'r</span><span class="op">></span> <span class="ident">NumAssignOps</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'r</span> <span class="self">Self</span><span class="op">></span> {} |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">NumAssignRef</span> <span class="kw">for</span> <span class="ident">T</span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">NumAssign</span> <span class="op">+</span> <span class="kw">for</span><span class="op"><</span><span class="lifetime">'r</span><span class="op">></span> <span class="ident">NumAssignOps</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'r</span> <span class="ident">T</span><span class="op">></span> {} |
| |
| <span class="macro">macro_rules!</span> <span class="ident">int_trait_impl</span> { |
| (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> <span class="kw">for</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ty</span>)<span class="kw-2">*</span>) => ($( |
| <span class="kw">impl</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> { |
| <span class="kw">type</span> <span class="ident">FromStrRadixErr</span> <span class="op">=</span> <span class="ident">::core::num::ParseIntError</span>; |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">from_str_radix</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">radix</span>: <span class="ident">u32</span>) |
| -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">::core::num::ParseIntError</span><span class="op">></span> |
| { |
| <span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span><span class="op">></span><span class="ident">::from_str_radix</span>(<span class="ident">s</span>, <span class="ident">radix</span>) |
| } |
| } |
| )<span class="kw-2">*</span>) |
| } |
| <span class="macro">int_trait_impl!</span>(<span class="ident">Num</span> <span class="kw">for</span> <span class="ident">usize</span> <span class="ident">u8</span> <span class="ident">u16</span> <span class="ident">u32</span> <span class="ident">u64</span> <span class="ident">isize</span> <span class="ident">i8</span> <span class="ident">i16</span> <span class="ident">i32</span> <span class="ident">i64</span>); |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">has_i128</span>)]</span> |
| <span class="macro">int_trait_impl!</span>(<span class="ident">Num</span> <span class="kw">for</span> <span class="ident">u128</span> <span class="ident">i128</span>); |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Num</span><span class="op">></span> <span class="ident">Num</span> <span class="kw">for</span> <span class="ident">Wrapping</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> |
| <span class="kw">where</span> |
| <span class="ident">Wrapping</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>: <span class="ident">Add</span><span class="op"><</span><span class="ident">Output</span> <span class="op">=</span> <span class="ident">Wrapping</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> |
| <span class="op">+</span> <span class="ident">Sub</span><span class="op"><</span><span class="ident">Output</span> <span class="op">=</span> <span class="ident">Wrapping</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> |
| <span class="op">+</span> <span class="ident">Mul</span><span class="op"><</span><span class="ident">Output</span> <span class="op">=</span> <span class="ident">Wrapping</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> |
| <span class="op">+</span> <span class="ident">Div</span><span class="op"><</span><span class="ident">Output</span> <span class="op">=</span> <span class="ident">Wrapping</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> |
| <span class="op">+</span> <span class="ident">Rem</span><span class="op"><</span><span class="ident">Output</span> <span class="op">=</span> <span class="ident">Wrapping</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>, |
| { |
| <span class="kw">type</span> <span class="ident">FromStrRadixErr</span> <span class="op">=</span> <span class="ident">T::FromStrRadixErr</span>; |
| <span class="kw">fn</span> <span class="ident">from_str_radix</span>(<span class="ident">str</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">radix</span>: <span class="ident">u32</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>, <span class="ident"><span class="self">Self</span>::FromStrRadixErr</span><span class="op">></span> { |
| <span class="ident">T::from_str_radix</span>(<span class="ident">str</span>, <span class="ident">radix</span>).<span class="ident">map</span>(<span class="ident">Wrapping</span>) |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">FloatErrorKind</span> { |
| <span class="ident">Empty</span>, |
| <span class="ident">Invalid</span>, |
| } |
| <span class="comment">// FIXME: core::num::ParseFloatError is stable in 1.0, but opaque to us,</span> |
| <span class="comment">// so there's not really any way for us to reuse it.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ParseFloatError</span> { |
| <span class="kw">pub</span> <span class="ident">kind</span>: <span class="ident">FloatErrorKind</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">fmt::Display</span> <span class="kw">for</span> <span class="ident">ParseFloatError</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> { |
| <span class="kw">let</span> <span class="ident">description</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">kind</span> { |
| <span class="ident">FloatErrorKind::Empty</span> => <span class="string">"cannot parse float from empty string"</span>, |
| <span class="ident">FloatErrorKind::Invalid</span> => <span class="string">"invalid float literal"</span>, |
| }; |
| |
| <span class="ident">description</span>.<span class="ident">fmt</span>(<span class="ident">f</span>) |
| } |
| } |
| |
| <span class="comment">// FIXME: The standard library from_str_radix on floats was deprecated, so we're stuck</span> |
| <span class="comment">// with this implementation ourselves until we want to make a breaking change.</span> |
| <span class="comment">// (would have to drop it from `Num` though)</span> |
| <span class="macro">macro_rules!</span> <span class="ident">float_trait_impl</span> { |
| (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> <span class="kw">for</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ident</span>)<span class="kw-2">*</span>) => ($( |
| <span class="kw">impl</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> { |
| <span class="kw">type</span> <span class="ident">FromStrRadixErr</span> <span class="op">=</span> <span class="ident">ParseFloatError</span>; |
| |
| <span class="kw">fn</span> <span class="ident">from_str_radix</span>(<span class="ident">src</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">radix</span>: <span class="ident">u32</span>) |
| -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>, <span class="ident"><span class="self">Self</span>::FromStrRadixErr</span><span class="op">></span> |
| { |
| <span class="kw">use</span> <span class="ident"><span class="self">self</span>::FloatErrorKind</span>::<span class="kw-2">*</span>; |
| <span class="kw">use</span> <span class="ident"><span class="self">self</span>::ParseFloatError</span> <span class="kw">as</span> <span class="ident">PFE</span>; |
| |
| <span class="comment">// Special values</span> |
| <span class="kw">match</span> <span class="ident">src</span> { |
| <span class="string">"inf"</span> => <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">core</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t::INFINITY</span>), |
| <span class="string">"-inf"</span> => <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">core</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t::NEG_INFINITY</span>), |
| <span class="string">"NaN"</span> => <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">core</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t::NAN</span>), |
| <span class="kw">_</span> => {}, |
| } |
| |
| <span class="kw">fn</span> <span class="ident">slice_shift_char</span>(<span class="ident">src</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="ident">char</span>, <span class="kw-2">&</span><span class="ident">str</span>)<span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">chars</span> <span class="op">=</span> <span class="ident">src</span>.<span class="ident">chars</span>(); |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">ch</span>) <span class="op">=</span> <span class="ident">chars</span>.<span class="ident">next</span>() { |
| <span class="prelude-val">Some</span>((<span class="ident">ch</span>, <span class="ident">chars</span>.<span class="ident">as_str</span>())) |
| } <span class="kw">else</span> { |
| <span class="prelude-val">None</span> |
| } |
| } |
| |
| <span class="kw">let</span> (<span class="ident">is_positive</span>, <span class="ident">src</span>) <span class="op">=</span> <span class="kw">match</span> <span class="ident">slice_shift_char</span>(<span class="ident">src</span>) { |
| <span class="prelude-val">None</span> => <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">PFE</span> { <span class="ident">kind</span>: <span class="ident">Empty</span> }), |
| <span class="prelude-val">Some</span>((<span class="string">'-'</span>, <span class="string">""</span>)) => <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">PFE</span> { <span class="ident">kind</span>: <span class="ident">Empty</span> }), |
| <span class="prelude-val">Some</span>((<span class="string">'-'</span>, <span class="ident">src</span>)) => (<span class="bool-val">false</span>, <span class="ident">src</span>), |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="kw">_</span>)) => (<span class="bool-val">true</span>, <span class="ident">src</span>), |
| }; |
| |
| <span class="comment">// The significand to accumulate</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">sig</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">is_positive</span> { <span class="number">0.0</span> } <span class="kw">else</span> { <span class="op">-</span><span class="number">0.0</span> }; |
| <span class="comment">// Necessary to detect overflow</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">prev_sig</span> <span class="op">=</span> <span class="ident">sig</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cs</span> <span class="op">=</span> <span class="ident">src</span>.<span class="ident">chars</span>().<span class="ident">enumerate</span>(); |
| <span class="comment">// Exponent prefix and exponent index offset</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">exp_info</span> <span class="op">=</span> <span class="prelude-val">None</span>::<span class="op"><</span>(<span class="ident">char</span>, <span class="ident">usize</span>)<span class="op">></span>; |
| |
| <span class="comment">// Parse the integer part of the significand</span> |
| <span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">c</span>) <span class="kw">in</span> <span class="ident">cs</span>.<span class="ident">by_ref</span>() { |
| <span class="kw">match</span> <span class="ident">c</span>.<span class="ident">to_digit</span>(<span class="ident">radix</span>) { |
| <span class="prelude-val">Some</span>(<span class="ident">digit</span>) => { |
| <span class="comment">// shift significand one digit left</span> |
| <span class="ident">sig</span> <span class="op">=</span> <span class="ident">sig</span> <span class="op">*</span> (<span class="ident">radix</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>); |
| |
| <span class="comment">// add/subtract current digit depending on sign</span> |
| <span class="kw">if</span> <span class="ident">is_positive</span> { |
| <span class="ident">sig</span> <span class="op">=</span> <span class="ident">sig</span> <span class="op">+</span> ((<span class="ident">digit</span> <span class="kw">as</span> <span class="ident">isize</span>) <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>); |
| } <span class="kw">else</span> { |
| <span class="ident">sig</span> <span class="op">=</span> <span class="ident">sig</span> <span class="op">-</span> ((<span class="ident">digit</span> <span class="kw">as</span> <span class="ident">isize</span>) <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>); |
| } |
| |
| <span class="comment">// Detect overflow by comparing to last value, except</span> |
| <span class="comment">// if we've not seen any non-zero digits.</span> |
| <span class="kw">if</span> <span class="ident">prev_sig</span> <span class="op">!</span><span class="op">=</span> <span class="number">0.0</span> { |
| <span class="kw">if</span> <span class="ident">is_positive</span> <span class="op">&&</span> <span class="ident">sig</span> <span class="op"><</span><span class="op">=</span> <span class="ident">prev_sig</span> |
| { <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">core</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t::INFINITY</span>); } |
| <span class="kw">if</span> <span class="op">!</span><span class="ident">is_positive</span> <span class="op">&&</span> <span class="ident">sig</span> <span class="op">></span><span class="op">=</span> <span class="ident">prev_sig</span> |
| { <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">core</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t::NEG_INFINITY</span>); } |
| |
| <span class="comment">// Detect overflow by reversing the shift-and-add process</span> |
| <span class="kw">if</span> <span class="ident">is_positive</span> <span class="op">&&</span> (<span class="ident">prev_sig</span> <span class="op">!</span><span class="op">=</span> (<span class="ident">sig</span> <span class="op">-</span> <span class="ident">digit</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>) <span class="op">/</span> <span class="ident">radix</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>) |
| { <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">core</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t::INFINITY</span>); } |
| <span class="kw">if</span> <span class="op">!</span><span class="ident">is_positive</span> <span class="op">&&</span> (<span class="ident">prev_sig</span> <span class="op">!</span><span class="op">=</span> (<span class="ident">sig</span> <span class="op">+</span> <span class="ident">digit</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>) <span class="op">/</span> <span class="ident">radix</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>) |
| { <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">core</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t::NEG_INFINITY</span>); } |
| } |
| <span class="ident">prev_sig</span> <span class="op">=</span> <span class="ident">sig</span>; |
| }, |
| <span class="prelude-val">None</span> => <span class="kw">match</span> <span class="ident">c</span> { |
| <span class="string">'e'</span> <span class="op">|</span> <span class="string">'E'</span> <span class="op">|</span> <span class="string">'p'</span> <span class="op">|</span> <span class="string">'P'</span> => { |
| <span class="ident">exp_info</span> <span class="op">=</span> <span class="prelude-val">Some</span>((<span class="ident">c</span>, <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>)); |
| <span class="kw">break</span>; <span class="comment">// start of exponent</span> |
| }, |
| <span class="string">'.'</span> => { |
| <span class="kw">break</span>; <span class="comment">// start of fractional part</span> |
| }, |
| <span class="kw">_</span> => { |
| <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">PFE</span> { <span class="ident">kind</span>: <span class="ident">Invalid</span> }); |
| }, |
| }, |
| } |
| } |
| |
| <span class="comment">// If we are not yet at the exponent parse the fractional</span> |
| <span class="comment">// part of the significand</span> |
| <span class="kw">if</span> <span class="ident">exp_info</span>.<span class="ident">is_none</span>() { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">power</span> <span class="op">=</span> <span class="number">1.0</span>; |
| <span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">c</span>) <span class="kw">in</span> <span class="ident">cs</span>.<span class="ident">by_ref</span>() { |
| <span class="kw">match</span> <span class="ident">c</span>.<span class="ident">to_digit</span>(<span class="ident">radix</span>) { |
| <span class="prelude-val">Some</span>(<span class="ident">digit</span>) => { |
| <span class="comment">// Decrease power one order of magnitude</span> |
| <span class="ident">power</span> <span class="op">=</span> <span class="ident">power</span> <span class="op">/</span> (<span class="ident">radix</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>); |
| <span class="comment">// add/subtract current digit depending on sign</span> |
| <span class="ident">sig</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">is_positive</span> { |
| <span class="ident">sig</span> <span class="op">+</span> (<span class="ident">digit</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>) <span class="op">*</span> <span class="ident">power</span> |
| } <span class="kw">else</span> { |
| <span class="ident">sig</span> <span class="op">-</span> (<span class="ident">digit</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>) <span class="op">*</span> <span class="ident">power</span> |
| }; |
| <span class="comment">// Detect overflow by comparing to last value</span> |
| <span class="kw">if</span> <span class="ident">is_positive</span> <span class="op">&&</span> <span class="ident">sig</span> <span class="op"><</span> <span class="ident">prev_sig</span> |
| { <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">core</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t::INFINITY</span>); } |
| <span class="kw">if</span> <span class="op">!</span><span class="ident">is_positive</span> <span class="op">&&</span> <span class="ident">sig</span> <span class="op">></span> <span class="ident">prev_sig</span> |
| { <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">core</span>::<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t::NEG_INFINITY</span>); } |
| <span class="ident">prev_sig</span> <span class="op">=</span> <span class="ident">sig</span>; |
| }, |
| <span class="prelude-val">None</span> => <span class="kw">match</span> <span class="ident">c</span> { |
| <span class="string">'e'</span> <span class="op">|</span> <span class="string">'E'</span> <span class="op">|</span> <span class="string">'p'</span> <span class="op">|</span> <span class="string">'P'</span> => { |
| <span class="ident">exp_info</span> <span class="op">=</span> <span class="prelude-val">Some</span>((<span class="ident">c</span>, <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>)); |
| <span class="kw">break</span>; <span class="comment">// start of exponent</span> |
| }, |
| <span class="kw">_</span> => { |
| <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">PFE</span> { <span class="ident">kind</span>: <span class="ident">Invalid</span> }); |
| }, |
| }, |
| } |
| } |
| } |
| |
| <span class="comment">// Parse and calculate the exponent</span> |
| <span class="kw">let</span> <span class="ident">exp</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">exp_info</span> { |
| <span class="prelude-val">Some</span>((<span class="ident">c</span>, <span class="ident">offset</span>)) => { |
| <span class="kw">let</span> <span class="ident">base</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">c</span> { |
| <span class="string">'E'</span> <span class="op">|</span> <span class="string">'e'</span> <span class="kw">if</span> <span class="ident">radix</span> <span class="op">==</span> <span class="number">10</span> => <span class="number">10.0</span>, |
| <span class="string">'P'</span> <span class="op">|</span> <span class="string">'p'</span> <span class="kw">if</span> <span class="ident">radix</span> <span class="op">==</span> <span class="number">16</span> => <span class="number">2.0</span>, |
| <span class="kw">_</span> => <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">PFE</span> { <span class="ident">kind</span>: <span class="ident">Invalid</span> }), |
| }; |
| |
| <span class="comment">// Parse the exponent as decimal integer</span> |
| <span class="kw">let</span> <span class="ident">src</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">src</span>[<span class="ident">offset</span>..]; |
| <span class="kw">let</span> (<span class="ident">is_positive</span>, <span class="ident">exp</span>) <span class="op">=</span> <span class="kw">match</span> <span class="ident">slice_shift_char</span>(<span class="ident">src</span>) { |
| <span class="prelude-val">Some</span>((<span class="string">'-'</span>, <span class="ident">src</span>)) => (<span class="bool-val">false</span>, <span class="ident">src</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">usize</span><span class="op">></span>()), |
| <span class="prelude-val">Some</span>((<span class="string">'+'</span>, <span class="ident">src</span>)) => (<span class="bool-val">true</span>, <span class="ident">src</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">usize</span><span class="op">></span>()), |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, <span class="kw">_</span>)) => (<span class="bool-val">true</span>, <span class="ident">src</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="ident">usize</span><span class="op">></span>()), |
| <span class="prelude-val">None</span> => <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">PFE</span> { <span class="ident">kind</span>: <span class="ident">Invalid</span> }), |
| }; |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>)]</span> |
| <span class="kw">fn</span> <span class="ident">pow</span>(<span class="ident">base</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>, <span class="ident">exp</span>: <span class="ident">usize</span>) -> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> { |
| <span class="ident">Float::powi</span>(<span class="ident">base</span>, <span class="ident">exp</span> <span class="kw">as</span> <span class="ident">i32</span>) |
| } |
| <span class="comment">// otherwise uses the generic `pow` from the root</span> |
| |
| <span class="kw">match</span> (<span class="ident">is_positive</span>, <span class="ident">exp</span>) { |
| (<span class="bool-val">true</span>, <span class="prelude-val">Ok</span>(<span class="ident">exp</span>)) => <span class="ident">pow</span>(<span class="ident">base</span>, <span class="ident">exp</span>), |
| (<span class="bool-val">false</span>, <span class="prelude-val">Ok</span>(<span class="ident">exp</span>)) => <span class="number">1.0</span> <span class="op">/</span> <span class="ident">pow</span>(<span class="ident">base</span>, <span class="ident">exp</span>), |
| (<span class="kw">_</span>, <span class="prelude-val">Err</span>(<span class="kw">_</span>)) => <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">PFE</span> { <span class="ident">kind</span>: <span class="ident">Invalid</span> }), |
| } |
| }, |
| <span class="prelude-val">None</span> => <span class="number">1.0</span>, <span class="comment">// no exponent</span> |
| }; |
| |
| <span class="prelude-val">Ok</span>(<span class="ident">sig</span> <span class="op">*</span> <span class="ident">exp</span>) |
| } |
| } |
| )<span class="kw-2">*</span>) |
| } |
| <span class="macro">float_trait_impl!</span>(<span class="ident">Num</span> <span class="kw">for</span> <span class="ident">f32</span> <span class="ident">f64</span>); |
| |
| <span class="doccomment">/// A value bounded by a minimum and a maximum</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If input is less than min then this returns min.</span> |
| <span class="doccomment">/// If input is greater than max then this returns max.</span> |
| <span class="doccomment">/// Otherwise this returns input.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// **Panics** in debug mode if `!(min <= max)`.</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clamp</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">PartialOrd</span><span class="op">></span>(<span class="ident">input</span>: <span class="ident">T</span>, <span class="ident">min</span>: <span class="ident">T</span>, <span class="ident">max</span>: <span class="ident">T</span>) -> <span class="ident">T</span> { |
| <span class="macro">debug_assert!</span>(<span class="ident">min</span> <span class="op"><</span><span class="op">=</span> <span class="ident">max</span>, <span class="string">"min must be less than or equal to max"</span>); |
| <span class="kw">if</span> <span class="ident">input</span> <span class="op"><</span> <span class="ident">min</span> { |
| <span class="ident">min</span> |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">input</span> <span class="op">></span> <span class="ident">max</span> { |
| <span class="ident">max</span> |
| } <span class="kw">else</span> { |
| <span class="ident">input</span> |
| } |
| } |
| |
| <span class="doccomment">/// A value bounded by a minimum value</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If input is less than min then this returns min.</span> |
| <span class="doccomment">/// Otherwise this returns input.</span> |
| <span class="doccomment">/// `clamp_min(std::f32::NAN, 1.0)` preserves `NAN` different from `f32::min(std::f32::NAN, 1.0)`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// **Panics** in debug mode if `!(min == min)`. (This occurs if `min` is `NAN`.)</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clamp_min</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">PartialOrd</span><span class="op">></span>(<span class="ident">input</span>: <span class="ident">T</span>, <span class="ident">min</span>: <span class="ident">T</span>) -> <span class="ident">T</span> { |
| <span class="macro">debug_assert!</span>(<span class="ident">min</span> <span class="op">==</span> <span class="ident">min</span>, <span class="string">"min must not be NAN"</span>); |
| <span class="kw">if</span> <span class="ident">input</span> <span class="op"><</span> <span class="ident">min</span> { |
| <span class="ident">min</span> |
| } <span class="kw">else</span> { |
| <span class="ident">input</span> |
| } |
| } |
| |
| <span class="doccomment">/// A value bounded by a maximum value</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// If input is greater than max then this returns max.</span> |
| <span class="doccomment">/// Otherwise this returns input.</span> |
| <span class="doccomment">/// `clamp_max(std::f32::NAN, 1.0)` preserves `NAN` different from `f32::max(std::f32::NAN, 1.0)`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// **Panics** in debug mode if `!(max == max)`. (This occurs if `max` is `NAN`.)</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clamp_max</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">PartialOrd</span><span class="op">></span>(<span class="ident">input</span>: <span class="ident">T</span>, <span class="ident">max</span>: <span class="ident">T</span>) -> <span class="ident">T</span> { |
| <span class="macro">debug_assert!</span>(<span class="ident">max</span> <span class="op">==</span> <span class="ident">max</span>, <span class="string">"max must not be NAN"</span>); |
| <span class="kw">if</span> <span class="ident">input</span> <span class="op">></span> <span class="ident">max</span> { |
| <span class="ident">max</span> |
| } <span class="kw">else</span> { |
| <span class="ident">input</span> |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">clamp_test</span>() { |
| <span class="comment">// Int test</span> |
| <span class="macro">assert_eq!</span>(<span class="number">1</span>, <span class="ident">clamp</span>(<span class="number">1</span>, <span class="op">-</span><span class="number">1</span>, <span class="number">2</span>)); |
| <span class="macro">assert_eq!</span>(<span class="op">-</span><span class="number">1</span>, <span class="ident">clamp</span>(<span class="op">-</span><span class="number">2</span>, <span class="op">-</span><span class="number">1</span>, <span class="number">2</span>)); |
| <span class="macro">assert_eq!</span>(<span class="number">2</span>, <span class="ident">clamp</span>(<span class="number">3</span>, <span class="op">-</span><span class="number">1</span>, <span class="number">2</span>)); |
| <span class="macro">assert_eq!</span>(<span class="number">1</span>, <span class="ident">clamp_min</span>(<span class="number">1</span>, <span class="op">-</span><span class="number">1</span>)); |
| <span class="macro">assert_eq!</span>(<span class="op">-</span><span class="number">1</span>, <span class="ident">clamp_min</span>(<span class="op">-</span><span class="number">2</span>, <span class="op">-</span><span class="number">1</span>)); |
| <span class="macro">assert_eq!</span>(<span class="op">-</span><span class="number">1</span>, <span class="ident">clamp_max</span>(<span class="number">1</span>, <span class="op">-</span><span class="number">1</span>)); |
| <span class="macro">assert_eq!</span>(<span class="op">-</span><span class="number">2</span>, <span class="ident">clamp_max</span>(<span class="op">-</span><span class="number">2</span>, <span class="op">-</span><span class="number">1</span>)); |
| |
| <span class="comment">// Float test</span> |
| <span class="macro">assert_eq!</span>(<span class="number">1.0</span>, <span class="ident">clamp</span>(<span class="number">1.0</span>, <span class="op">-</span><span class="number">1.0</span>, <span class="number">2.0</span>)); |
| <span class="macro">assert_eq!</span>(<span class="op">-</span><span class="number">1.0</span>, <span class="ident">clamp</span>(<span class="op">-</span><span class="number">2.0</span>, <span class="op">-</span><span class="number">1.0</span>, <span class="number">2.0</span>)); |
| <span class="macro">assert_eq!</span>(<span class="number">2.0</span>, <span class="ident">clamp</span>(<span class="number">3.0</span>, <span class="op">-</span><span class="number">1.0</span>, <span class="number">2.0</span>)); |
| <span class="macro">assert_eq!</span>(<span class="number">1.0</span>, <span class="ident">clamp_min</span>(<span class="number">1.0</span>, <span class="op">-</span><span class="number">1.0</span>)); |
| <span class="macro">assert_eq!</span>(<span class="op">-</span><span class="number">1.0</span>, <span class="ident">clamp_min</span>(<span class="op">-</span><span class="number">2.0</span>, <span class="op">-</span><span class="number">1.0</span>)); |
| <span class="macro">assert_eq!</span>(<span class="op">-</span><span class="number">1.0</span>, <span class="ident">clamp_max</span>(<span class="number">1.0</span>, <span class="op">-</span><span class="number">1.0</span>)); |
| <span class="macro">assert_eq!</span>(<span class="op">-</span><span class="number">2.0</span>, <span class="ident">clamp_max</span>(<span class="op">-</span><span class="number">2.0</span>, <span class="op">-</span><span class="number">1.0</span>)); |
| <span class="macro">assert!</span>(<span class="ident">clamp</span>(<span class="ident">::core::f32::NAN</span>, <span class="op">-</span><span class="number">1.0</span>, <span class="number">1.0</span>).<span class="ident">is_nan</span>()); |
| <span class="macro">assert!</span>(<span class="ident">clamp_min</span>(<span class="ident">::core::f32::NAN</span>, <span class="number">1.0</span>).<span class="ident">is_nan</span>()); |
| <span class="macro">assert!</span>(<span class="ident">clamp_max</span>(<span class="ident">::core::f32::NAN</span>, <span class="number">1.0</span>).<span class="ident">is_nan</span>()); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="attribute">#[<span class="ident">should_panic</span>]</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug_assertions</span>)]</span> |
| <span class="kw">fn</span> <span class="ident">clamp_nan_min</span>() { |
| <span class="ident">clamp</span>(<span class="number">0.</span>, <span class="ident">::core::f32::NAN</span>, <span class="number">1.</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="attribute">#[<span class="ident">should_panic</span>]</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug_assertions</span>)]</span> |
| <span class="kw">fn</span> <span class="ident">clamp_nan_max</span>() { |
| <span class="ident">clamp</span>(<span class="number">0.</span>, <span class="op">-</span><span class="number">1.</span>, <span class="ident">::core::f32::NAN</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="attribute">#[<span class="ident">should_panic</span>]</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug_assertions</span>)]</span> |
| <span class="kw">fn</span> <span class="ident">clamp_nan_min_max</span>() { |
| <span class="ident">clamp</span>(<span class="number">0.</span>, <span class="ident">::core::f32::NAN</span>, <span class="ident">::core::f32::NAN</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="attribute">#[<span class="ident">should_panic</span>]</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug_assertions</span>)]</span> |
| <span class="kw">fn</span> <span class="ident">clamp_min_nan_min</span>() { |
| <span class="ident">clamp_min</span>(<span class="number">0.</span>, <span class="ident">::core::f32::NAN</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="attribute">#[<span class="ident">should_panic</span>]</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">debug_assertions</span>)]</span> |
| <span class="kw">fn</span> <span class="ident">clamp_max_nan_max</span>() { |
| <span class="ident">clamp_max</span>(<span class="number">0.</span>, <span class="ident">::core::f32::NAN</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">from_str_radix_unwrap</span>() { |
| <span class="comment">// The Result error must impl Debug to allow unwrap()</span> |
| |
| <span class="kw">let</span> <span class="ident">i</span>: <span class="ident">i32</span> <span class="op">=</span> <span class="ident">Num::from_str_radix</span>(<span class="string">"0"</span>, <span class="number">10</span>).<span class="ident">unwrap</span>(); |
| <span class="macro">assert_eq!</span>(<span class="ident">i</span>, <span class="number">0</span>); |
| |
| <span class="kw">let</span> <span class="ident">f</span>: <span class="ident">f32</span> <span class="op">=</span> <span class="ident">Num::from_str_radix</span>(<span class="string">"0.0"</span>, <span class="number">10</span>).<span class="ident">unwrap</span>(); |
| <span class="macro">assert_eq!</span>(<span class="ident">f</span>, <span class="number">0.0</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">from_str_radix_multi_byte_fail</span>() { |
| <span class="comment">// Ensure parsing doesn't panic, even on invalid sign characters</span> |
| <span class="macro">assert!</span>(<span class="ident">f32::from_str_radix</span>(<span class="string">"™0.2"</span>, <span class="number">10</span>).<span class="ident">is_err</span>()); |
| |
| <span class="comment">// Even when parsing the exponent sign</span> |
| <span class="macro">assert!</span>(<span class="ident">f32::from_str_radix</span>(<span class="string">"0.2E™1"</span>, <span class="number">10</span>).<span class="ident">is_err</span>()); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">wrapping_is_num</span>() { |
| <span class="kw">fn</span> <span class="ident">require_num</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Num</span><span class="op">></span>(<span class="kw">_</span>: <span class="kw-2">&</span><span class="ident">T</span>) {} |
| <span class="ident">require_num</span>(<span class="kw-2">&</span><span class="ident">Wrapping</span>(<span class="number">42_u32</span>)); |
| <span class="ident">require_num</span>(<span class="kw-2">&</span><span class="ident">Wrapping</span>(<span class="op">-</span><span class="number">42</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">wrapping_from_str_radix</span>() { |
| <span class="macro">macro_rules!</span> <span class="ident">test_wrapping_from_str_radix</span> { |
| ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ty</span>)<span class="op">+</span>) => { |
| $( |
| <span class="kw">for</span> <span class="kw-2">&</span>(<span class="ident">s</span>, <span class="ident">r</span>) <span class="kw">in</span> <span class="kw-2">&</span>[(<span class="string">"42"</span>, <span class="number">10</span>), (<span class="string">"42"</span>, <span class="number">2</span>), (<span class="string">"-13.0"</span>, <span class="number">10</span>), (<span class="string">"foo"</span>, <span class="number">10</span>)] { |
| <span class="kw">let</span> <span class="ident">w</span> <span class="op">=</span> <span class="ident">Wrapping</span>::<span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span><span class="op">></span><span class="ident">::from_str_radix</span>(<span class="ident">s</span>, <span class="ident">r</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">w</span><span class="op">|</span> <span class="ident">w</span>.<span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(<span class="ident">w</span>, <span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> <span class="kw">as</span> <span class="ident">Num</span><span class="op">></span><span class="ident">::from_str_radix</span>(<span class="ident">s</span>, <span class="ident">r</span>)); |
| } |
| )<span class="op">+</span> |
| }; |
| } |
| |
| <span class="macro">test_wrapping_from_str_radix!</span>(<span class="ident">usize</span> <span class="ident">u8</span> <span class="ident">u16</span> <span class="ident">u32</span> <span class="ident">u64</span> <span class="ident">isize</span> <span class="ident">i8</span> <span class="ident">i16</span> <span class="ident">i32</span> <span class="ident">i64</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">check_num_ops</span>() { |
| <span class="kw">fn</span> <span class="ident">compute</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Num</span> <span class="op">+</span> <span class="ident">Copy</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>, <span class="ident">y</span>: <span class="ident">T</span>) -> <span class="ident">T</span> { |
| <span class="ident">x</span> <span class="op">*</span> <span class="ident">y</span> <span class="op">/</span> <span class="ident">y</span> <span class="op">%</span> <span class="ident">y</span> <span class="op">+</span> <span class="ident">y</span> <span class="op">-</span> <span class="ident">y</span> |
| } |
| <span class="macro">assert_eq!</span>(<span class="ident">compute</span>(<span class="number">1</span>, <span class="number">2</span>), <span class="number">1</span>) |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">check_numref_ops</span>() { |
| <span class="kw">fn</span> <span class="ident">compute</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">NumRef</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">T</span>, <span class="ident">y</span>: <span class="kw-2">&</span><span class="ident">T</span>) -> <span class="ident">T</span> { |
| <span class="ident">x</span> <span class="op">*</span> <span class="ident">y</span> <span class="op">/</span> <span class="ident">y</span> <span class="op">%</span> <span class="ident">y</span> <span class="op">+</span> <span class="ident">y</span> <span class="op">-</span> <span class="ident">y</span> |
| } |
| <span class="macro">assert_eq!</span>(<span class="ident">compute</span>(<span class="number">1</span>, <span class="kw-2">&</span><span class="number">2</span>), <span class="number">1</span>) |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">check_refnum_ops</span>() { |
| <span class="kw">fn</span> <span class="ident">compute</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Copy</span><span class="op">></span>(<span class="ident">x</span>: <span class="kw-2">&</span><span class="ident">T</span>, <span class="ident">y</span>: <span class="ident">T</span>) -> <span class="ident">T</span> |
| <span class="kw">where</span> |
| <span class="kw">for</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>: <span class="ident">RefNum</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, |
| { |
| <span class="kw-2">&</span>(<span class="kw-2">&</span>(<span class="kw-2">&</span>(<span class="kw-2">&</span>(<span class="ident">x</span> <span class="op">*</span> <span class="ident">y</span>) <span class="op">/</span> <span class="ident">y</span>) <span class="op">%</span> <span class="ident">y</span>) <span class="op">+</span> <span class="ident">y</span>) <span class="op">-</span> <span class="ident">y</span> |
| } |
| <span class="macro">assert_eq!</span>(<span class="ident">compute</span>(<span class="kw-2">&</span><span class="number">1</span>, <span class="number">2</span>), <span class="number">1</span>) |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">check_refref_ops</span>() { |
| <span class="kw">fn</span> <span class="ident">compute</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="kw-2">&</span><span class="ident">T</span>, <span class="ident">y</span>: <span class="kw-2">&</span><span class="ident">T</span>) -> <span class="ident">T</span> |
| <span class="kw">where</span> |
| <span class="kw">for</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>: <span class="ident">RefNum</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, |
| { |
| <span class="kw-2">&</span>(<span class="kw-2">&</span>(<span class="kw-2">&</span>(<span class="kw-2">&</span>(<span class="ident">x</span> <span class="op">*</span> <span class="ident">y</span>) <span class="op">/</span> <span class="ident">y</span>) <span class="op">%</span> <span class="ident">y</span>) <span class="op">+</span> <span class="ident">y</span>) <span class="op">-</span> <span class="ident">y</span> |
| } |
| <span class="macro">assert_eq!</span>(<span class="ident">compute</span>(<span class="kw-2">&</span><span class="number">1</span>, <span class="kw-2">&</span><span class="number">2</span>), <span class="number">1</span>) |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">check_numassign_ops</span>() { |
| <span class="kw">fn</span> <span class="ident">compute</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">NumAssign</span> <span class="op">+</span> <span class="ident">Copy</span><span class="op">></span>(<span class="kw-2">mut</span> <span class="ident">x</span>: <span class="ident">T</span>, <span class="ident">y</span>: <span class="ident">T</span>) -> <span class="ident">T</span> { |
| <span class="ident">x</span> <span class="kw-2">*</span><span class="op">=</span> <span class="ident">y</span>; |
| <span class="ident">x</span> <span class="op">/</span><span class="op">=</span> <span class="ident">y</span>; |
| <span class="ident">x</span> <span class="op">%</span><span class="op">=</span> <span class="ident">y</span>; |
| <span class="ident">x</span> <span class="op">+</span><span class="op">=</span> <span class="ident">y</span>; |
| <span class="ident">x</span> <span class="op">-</span><span class="op">=</span> <span class="ident">y</span>; |
| <span class="ident">x</span> |
| } |
| <span class="macro">assert_eq!</span>(<span class="ident">compute</span>(<span class="number">1</span>, <span class="number">2</span>), <span class="number">1</span>) |
| } |
| |
| <span class="comment">// TODO test `NumAssignRef`, but even the standard numeric types don't</span> |
| <span class="comment">// implement this yet. (see rust pr41336)</span> |
| </code></pre></div> |
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