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| </pre><pre class="rust"><code><span class="comment">// Copyright 2018 Developers of the Rand project.</span> |
| <span class="comment">//</span> |
| <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> |
| <span class="comment">// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> |
| <span class="comment">// <LICENSE-MIT or https://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">//! The implementations of the `Standard` distribution for other built-in types.</span> |
| |
| <span class="kw">use</span> <span class="ident">core::char</span>; |
| <span class="kw">use</span> <span class="ident">core::num::Wrapping</span>; |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"alloc"</span>)]</span> |
| <span class="kw">use</span> <span class="ident">alloc::string::String</span>; |
| |
| <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::distributions</span>::{<span class="ident">Distribution</span>, <span class="ident">Standard</span>, <span class="ident">Uniform</span>}; |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"alloc"</span>)]</span> |
| <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::distributions::DistString</span>; |
| <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::Rng</span>; |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"serde1"</span>)]</span> |
| <span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>}; |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"min_const_gen"</span>)]</span> |
| <span class="kw">use</span> <span class="ident">core::mem</span>::{<span class="self">self</span>, <span class="ident">MaybeUninit</span>}; |
| |
| |
| <span class="comment">// ----- Sampling distributions -----</span> |
| |
| <span class="doccomment">/// Sample a `u8`, uniformly distributed over ASCII letters and numbers:</span> |
| <span class="doccomment">/// a-z, A-Z and 0-9.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Example</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// use rand::{Rng, thread_rng};</span> |
| <span class="doccomment">/// use rand::distributions::Alphanumeric;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// let mut rng = thread_rng();</span> |
| <span class="doccomment">/// let chars: String = (0..7).map(|_| rng.sample(Alphanumeric) as char).collect();</span> |
| <span class="doccomment">/// println!("Random chars: {}", chars);</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The [`DistString`] trait provides an easier method of generating</span> |
| <span class="doccomment">/// a random `String`, and offers more efficient allocation:</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// use rand::distributions::{Alphanumeric, DistString};</span> |
| <span class="doccomment">/// let string = Alphanumeric.sample_string(&mut rand::thread_rng(), 16);</span> |
| <span class="doccomment">/// println!("Random string: {}", string);</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Passwords</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Users sometimes ask whether it is safe to use a string of random characters</span> |
| <span class="doccomment">/// as a password. In principle, all RNGs in Rand implementing `CryptoRng` are</span> |
| <span class="doccomment">/// suitable as a source of randomness for generating passwords (if they are</span> |
| <span class="doccomment">/// properly seeded), but it is more conservative to only use randomness</span> |
| <span class="doccomment">/// directly from the operating system via the `getrandom` crate, or the</span> |
| <span class="doccomment">/// corresponding bindings of a crypto library.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// When generating passwords or keys, it is important to consider the threat</span> |
| <span class="doccomment">/// model and in some cases the memorability of the password. This is out of</span> |
| <span class="doccomment">/// scope of the Rand project, and therefore we defer to the following</span> |
| <span class="doccomment">/// references:</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// - [Wikipedia article on Password Strength](https://en.wikipedia.org/wiki/Password_strength)</span> |
| <span class="doccomment">/// - [Diceware for generating memorable passwords](https://en.wikipedia.org/wiki/Diceware)</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Copy</span>)]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"serde1"</span>, <span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>))]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Alphanumeric</span>; |
| |
| |
| <span class="comment">// ----- Implementations of distributions -----</span> |
| |
| <span class="kw">impl</span> <span class="ident">Distribution</span><span class="op"><</span><span class="ident">char</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Standard</span> { |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">sample</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Rng</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">rng</span>: <span class="kw-2">&mut</span> <span class="ident">R</span>) -> <span class="ident">char</span> { |
| <span class="comment">// A valid `char` is either in the interval `[0, 0xD800)` or</span> |
| <span class="comment">// `(0xDFFF, 0x11_0000)`. All `char`s must therefore be in</span> |
| <span class="comment">// `[0, 0x11_0000)` but not in the "gap" `[0xD800, 0xDFFF]` which is</span> |
| <span class="comment">// reserved for surrogates. This is the size of that gap.</span> |
| <span class="kw">const</span> <span class="ident">GAP_SIZE</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">0xDFFF</span> <span class="op">-</span> <span class="number">0xD800</span> <span class="op">+</span> <span class="number">1</span>; |
| |
| <span class="comment">// Uniform::new(0, 0x11_0000 - GAP_SIZE) can also be used but it</span> |
| <span class="comment">// seemed slower.</span> |
| <span class="kw">let</span> <span class="ident">range</span> <span class="op">=</span> <span class="ident">Uniform::new</span>(<span class="ident">GAP_SIZE</span>, <span class="number">0x11_0000</span>); |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">range</span>.<span class="ident">sample</span>(<span class="ident">rng</span>); |
| <span class="kw">if</span> <span class="ident">n</span> <span class="op"><</span><span class="op">=</span> <span class="number">0xDFFF</span> { |
| <span class="ident">n</span> <span class="op">-</span><span class="op">=</span> <span class="ident">GAP_SIZE</span>; |
| } |
| <span class="kw">unsafe</span> { <span class="ident">char::from_u32_unchecked</span>(<span class="ident">n</span>) } |
| } |
| } |
| |
| <span class="doccomment">/// Note: the `String` is potentially left with excess capacity; optionally the</span> |
| <span class="doccomment">/// user may call `string.shrink_to_fit()` afterwards.</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"alloc"</span>)]</span> |
| <span class="kw">impl</span> <span class="ident">DistString</span> <span class="kw">for</span> <span class="ident">Standard</span> { |
| <span class="kw">fn</span> <span class="ident">append_string</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Rng</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">rng</span>: <span class="kw-2">&mut</span> <span class="ident">R</span>, <span class="ident">s</span>: <span class="kw-2">&mut</span> <span class="ident">String</span>, <span class="ident">len</span>: <span class="ident">usize</span>) { |
| <span class="comment">// A char is encoded with at most four bytes, thus this reservation is</span> |
| <span class="comment">// guaranteed to be sufficient. We do not shrink_to_fit afterwards so</span> |
| <span class="comment">// that repeated usage on the same `String` buffer does not reallocate.</span> |
| <span class="ident">s</span>.<span class="ident">reserve</span>(<span class="number">4</span> <span class="op">*</span> <span class="ident">len</span>); |
| <span class="ident">s</span>.<span class="ident">extend</span>(<span class="ident">Distribution</span>::<span class="op"><</span><span class="ident">char</span><span class="op">></span><span class="ident">::sample_iter</span>(<span class="self">self</span>, <span class="ident">rng</span>).<span class="ident">take</span>(<span class="ident">len</span>)); |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Distribution</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Alphanumeric</span> { |
| <span class="kw">fn</span> <span class="ident">sample</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Rng</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">rng</span>: <span class="kw-2">&mut</span> <span class="ident">R</span>) -> <span class="ident">u8</span> { |
| <span class="kw">const</span> <span class="ident">RANGE</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">26</span> <span class="op">+</span> <span class="number">26</span> <span class="op">+</span> <span class="number">10</span>; |
| <span class="kw">const</span> <span class="ident">GEN_ASCII_STR_CHARSET</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>] <span class="op">=</span> <span class="string">b"ABCDEFGHIJKLMNOPQRSTUVWXYZ\ |
| abcdefghijklmnopqrstuvwxyz\ |
| 0123456789"</span>; |
| <span class="comment">// We can pick from 62 characters. This is so close to a power of 2, 64,</span> |
| <span class="comment">// that we can do better than `Uniform`. Use a simple bitshift and</span> |
| <span class="comment">// rejection sampling. We do not use a bitmask, because for small RNGs</span> |
| <span class="comment">// the most significant bits are usually of higher quality.</span> |
| <span class="kw">loop</span> { |
| <span class="kw">let</span> <span class="ident">var</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">next_u32</span>() <span class="op">></span><span class="op">></span> (<span class="number">32</span> <span class="op">-</span> <span class="number">6</span>); |
| <span class="kw">if</span> <span class="ident">var</span> <span class="op"><</span> <span class="ident">RANGE</span> { |
| <span class="kw">return</span> <span class="ident">GEN_ASCII_STR_CHARSET</span>[<span class="ident">var</span> <span class="kw">as</span> <span class="ident">usize</span>]; |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"alloc"</span>)]</span> |
| <span class="kw">impl</span> <span class="ident">DistString</span> <span class="kw">for</span> <span class="ident">Alphanumeric</span> { |
| <span class="kw">fn</span> <span class="ident">append_string</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Rng</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">rng</span>: <span class="kw-2">&mut</span> <span class="ident">R</span>, <span class="ident">string</span>: <span class="kw-2">&mut</span> <span class="ident">String</span>, <span class="ident">len</span>: <span class="ident">usize</span>) { |
| <span class="kw">unsafe</span> { |
| <span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">string</span>.<span class="ident">as_mut_vec</span>(); |
| <span class="ident">v</span>.<span class="ident">extend</span>(<span class="self">self</span>.<span class="ident">sample_iter</span>(<span class="ident">rng</span>).<span class="ident">take</span>(<span class="ident">len</span>)); |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Distribution</span><span class="op"><</span><span class="ident">bool</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Standard</span> { |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">sample</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Rng</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">rng</span>: <span class="kw-2">&mut</span> <span class="ident">R</span>) -> <span class="ident">bool</span> { |
| <span class="comment">// We can compare against an arbitrary bit of an u32 to get a bool.</span> |
| <span class="comment">// Because the least significant bits of a lower quality RNG can have</span> |
| <span class="comment">// simple patterns, we compare against the most significant bit. This is</span> |
| <span class="comment">// easiest done using a sign test.</span> |
| (<span class="ident">rng</span>.<span class="ident">next_u32</span>() <span class="kw">as</span> <span class="ident">i32</span>) <span class="op"><</span> <span class="number">0</span> |
| } |
| } |
| |
| <span class="macro">macro_rules!</span> <span class="ident">tuple_impl</span> { |
| <span class="comment">// use variables to indicate the arity of the tuple</span> |
| ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tyvar</span>:<span class="ident">ident</span>),<span class="op">*</span> ) => { |
| <span class="comment">// the trailing commas are for the 1 tuple</span> |
| <span class="kw">impl</span><span class="op"><</span> $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tyvar</span> ),<span class="op">*</span> <span class="op">></span> |
| <span class="ident">Distribution</span><span class="op"><</span>( $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tyvar</span> ),<span class="op">*</span> , )<span class="op">></span> |
| <span class="kw">for</span> <span class="ident">Standard</span> |
| <span class="kw">where</span> $( <span class="ident">Standard</span>: <span class="ident">Distribution</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">tyvar</span><span class="op">></span> ),<span class="op">*</span> |
| { |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">sample</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Rng</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">_rng</span>: <span class="kw-2">&mut</span> <span class="ident">R</span>) -> ( $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tyvar</span> ),<span class="op">*</span> , ) { |
| ( |
| <span class="comment">// use the $tyvar's to get the appropriate number of</span> |
| <span class="comment">// repeats (they're not actually needed)</span> |
| $( |
| <span class="ident">_rng</span>.<span class="ident">gen</span>::<span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">tyvar</span><span class="op">></span>() |
| ),<span class="op">*</span> |
| , |
| ) |
| } |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Distribution</span><span class="op"><</span>()<span class="op">></span> <span class="kw">for</span> <span class="ident">Standard</span> { |
| <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::unused_unit</span>)]</span> |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">sample</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Rng</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&mut</span> <span class="ident">R</span>) -> () { |
| () |
| } |
| } |
| <span class="macro">tuple_impl!</span> {<span class="ident">A</span>} |
| <span class="macro">tuple_impl!</span> {<span class="ident">A</span>, <span class="ident">B</span>} |
| <span class="macro">tuple_impl!</span> {<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>} |
| <span class="macro">tuple_impl!</span> {<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>} |
| <span class="macro">tuple_impl!</span> {<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>, <span class="ident">E</span>} |
| <span class="macro">tuple_impl!</span> {<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>, <span class="ident">E</span>, <span class="ident">F</span>} |
| <span class="macro">tuple_impl!</span> {<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>, <span class="ident">E</span>, <span class="ident">F</span>, <span class="ident">G</span>} |
| <span class="macro">tuple_impl!</span> {<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>, <span class="ident">E</span>, <span class="ident">F</span>, <span class="ident">G</span>, <span class="ident">H</span>} |
| <span class="macro">tuple_impl!</span> {<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>, <span class="ident">E</span>, <span class="ident">F</span>, <span class="ident">G</span>, <span class="ident">H</span>, <span class="ident">I</span>} |
| <span class="macro">tuple_impl!</span> {<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>, <span class="ident">E</span>, <span class="ident">F</span>, <span class="ident">G</span>, <span class="ident">H</span>, <span class="ident">I</span>, <span class="ident">J</span>} |
| <span class="macro">tuple_impl!</span> {<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>, <span class="ident">E</span>, <span class="ident">F</span>, <span class="ident">G</span>, <span class="ident">H</span>, <span class="ident">I</span>, <span class="ident">J</span>, <span class="ident">K</span>} |
| <span class="macro">tuple_impl!</span> {<span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, <span class="ident">D</span>, <span class="ident">E</span>, <span class="ident">F</span>, <span class="ident">G</span>, <span class="ident">H</span>, <span class="ident">I</span>, <span class="ident">J</span>, <span class="ident">K</span>, <span class="ident">L</span>} |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"min_const_gen"</span>)]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"min_const_gen"</span>)))]</span> |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="kw">const</span> <span class="ident">N</span>: <span class="ident">usize</span><span class="op">></span> <span class="ident">Distribution</span><span class="op"><</span>[<span class="ident">T</span>; <span class="ident">N</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">Standard</span> |
| <span class="kw">where</span> <span class="ident">Standard</span>: <span class="ident">Distribution</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> |
| { |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">sample</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Rng</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">_rng</span>: <span class="kw-2">&mut</span> <span class="ident">R</span>) -> [<span class="ident">T</span>; <span class="ident">N</span>] { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buff</span>: [<span class="ident">MaybeUninit</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>; <span class="ident">N</span>] <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">MaybeUninit::uninit</span>().<span class="ident">assume_init</span>() }; |
| |
| <span class="kw">for</span> <span class="ident">elem</span> <span class="kw">in</span> <span class="kw-2">&mut</span> <span class="ident">buff</span> { |
| <span class="kw-2">*</span><span class="ident">elem</span> <span class="op">=</span> <span class="ident">MaybeUninit::new</span>(<span class="ident">_rng</span>.<span class="ident">gen</span>()); |
| } |
| |
| <span class="kw">unsafe</span> { <span class="ident">mem::transmute_copy</span>::<span class="op"><</span><span class="kw">_</span>, <span class="kw">_</span><span class="op">></span>(<span class="kw-2">&</span><span class="ident">buff</span>) } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"min_const_gen"</span>))]</span> |
| <span class="macro">macro_rules!</span> <span class="ident">array_impl</span> { |
| <span class="comment">// recursive, given at least one type parameter:</span> |
| {<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ident</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ts</span>:<span class="ident">ident</span>,)<span class="kw-2">*</span>} => { |
| <span class="macro">array_impl!</span>{(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span> <span class="op">-</span> <span class="number">1</span>), $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ts</span>,)<span class="kw-2">*</span>} |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Distribution</span><span class="op"><</span>[<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">Standard</span> <span class="kw">where</span> <span class="ident">Standard</span>: <span class="ident">Distribution</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">sample</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Rng</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">_rng</span>: <span class="kw-2">&mut</span> <span class="ident">R</span>) -> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>] { |
| [<span class="ident">_rng</span>.<span class="ident">gen</span>::<span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span><span class="op">></span>(), $(<span class="ident">_rng</span>.<span class="ident">gen</span>::<span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">ts</span><span class="op">></span>()),<span class="kw-2">*</span>] |
| } |
| } |
| }; |
| <span class="comment">// empty case:</span> |
| {<span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>:<span class="ident">expr</span>,} => { |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Distribution</span><span class="op"><</span>[<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">Standard</span> { |
| <span class="kw">fn</span> <span class="ident">sample</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Rng</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">_rng</span>: <span class="kw-2">&mut</span> <span class="ident">R</span>) -> [<span class="ident">T</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">n</span>] { [] } |
| } |
| }; |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"min_const_gen"</span>))]</span> |
| <span class="macro">array_impl!</span> {<span class="number">32</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>, <span class="ident">T</span>,} |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Distribution</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> <span class="kw">for</span> <span class="ident">Standard</span> |
| <span class="kw">where</span> <span class="ident">Standard</span>: <span class="ident">Distribution</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> |
| { |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">sample</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Rng</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">rng</span>: <span class="kw-2">&mut</span> <span class="ident">R</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { |
| <span class="comment">// UFCS is needed here: https://github.com/rust-lang/rust/issues/24066</span> |
| <span class="kw">if</span> <span class="ident">rng</span>.<span class="ident">gen</span>::<span class="op"><</span><span class="ident">bool</span><span class="op">></span>() { |
| <span class="prelude-val">Some</span>(<span class="ident">rng</span>.<span class="ident">gen</span>()) |
| } <span class="kw">else</span> { |
| <span class="prelude-val">None</span> |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Distribution</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">for</span> <span class="ident">Standard</span> |
| <span class="kw">where</span> <span class="ident">Standard</span>: <span class="ident">Distribution</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> |
| { |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">sample</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Rng</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">rng</span>: <span class="kw-2">&mut</span> <span class="ident">R</span>) -> <span class="ident">Wrapping</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { |
| <span class="ident">Wrapping</span>(<span class="ident">rng</span>.<span class="ident">gen</span>()) |
| } |
| } |
| |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> |
| <span class="kw">mod</span> <span class="ident">tests</span> { |
| <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::RngCore</span>; |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"alloc"</span>)]</span> <span class="kw">use</span> <span class="ident">alloc::string::String</span>; |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_misc</span>() { |
| <span class="kw">let</span> <span class="ident">rng</span>: <span class="kw-2">&mut</span> <span class="kw">dyn</span> <span class="ident">RngCore</span> <span class="op">=</span> <span class="kw-2">&mut</span> <span class="ident"><span class="kw">crate</span>::test::rng</span>(<span class="number">820</span>); |
| |
| <span class="ident">rng</span>.<span class="ident">sample</span>::<span class="op"><</span><span class="ident">char</span>, <span class="kw">_</span><span class="op">></span>(<span class="ident">Standard</span>); |
| <span class="ident">rng</span>.<span class="ident">sample</span>::<span class="op"><</span><span class="ident">bool</span>, <span class="kw">_</span><span class="op">></span>(<span class="ident">Standard</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"alloc"</span>)]</span> |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_chars</span>() { |
| <span class="kw">use</span> <span class="ident">core::iter</span>; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident"><span class="kw">crate</span>::test::rng</span>(<span class="number">805</span>); |
| |
| <span class="comment">// Test by generating a relatively large number of chars, so we also</span> |
| <span class="comment">// take the rejection sampling path.</span> |
| <span class="kw">let</span> <span class="ident">word</span>: <span class="ident">String</span> <span class="op">=</span> <span class="ident">iter::repeat</span>(()) |
| .<span class="ident">map</span>(<span class="op">|</span>()<span class="op">|</span> <span class="ident">rng</span>.<span class="ident">gen</span>::<span class="op"><</span><span class="ident">char</span><span class="op">></span>()) |
| .<span class="ident">take</span>(<span class="number">1000</span>) |
| .<span class="ident">collect</span>(); |
| <span class="macro">assert!</span>(<span class="op">!</span><span class="ident">word</span>.<span class="ident">is_empty</span>()); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_alphanumeric</span>() { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident"><span class="kw">crate</span>::test::rng</span>(<span class="number">806</span>); |
| |
| <span class="comment">// Test by generating a relatively large number of chars, so we also</span> |
| <span class="comment">// take the rejection sampling path.</span> |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">incorrect</span> <span class="op">=</span> <span class="bool-val">false</span>; |
| <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">100</span> { |
| <span class="kw">let</span> <span class="ident">c</span>: <span class="ident">char</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">sample</span>(<span class="ident">Alphanumeric</span>).<span class="ident">into</span>(); |
| <span class="ident">incorrect</span> <span class="op">|</span><span class="op">=</span> <span class="op">!</span>((<span class="string">'0'</span>..<span class="op">=</span><span class="string">'9'</span>).<span class="ident">contains</span>(<span class="kw-2">&</span><span class="ident">c</span>) <span class="op">|</span><span class="op">|</span> |
| (<span class="string">'A'</span>..<span class="op">=</span><span class="string">'Z'</span>).<span class="ident">contains</span>(<span class="kw-2">&</span><span class="ident">c</span>) <span class="op">|</span><span class="op">|</span> |
| (<span class="string">'a'</span>..<span class="op">=</span><span class="string">'z'</span>).<span class="ident">contains</span>(<span class="kw-2">&</span><span class="ident">c</span>) ); |
| } |
| <span class="macro">assert!</span>(<span class="op">!</span><span class="ident">incorrect</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">value_stability</span>() { |
| <span class="kw">fn</span> <span class="ident">test_samples</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Copy</span> <span class="op">+</span> <span class="ident">core::fmt::Debug</span> <span class="op">+</span> <span class="ident">PartialEq</span>, <span class="ident">D</span>: <span class="ident">Distribution</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>( |
| <span class="ident">distr</span>: <span class="kw-2">&</span><span class="ident">D</span>, <span class="ident">zero</span>: <span class="ident">T</span>, <span class="ident">expected</span>: <span class="kw-2">&</span>[<span class="ident">T</span>], |
| ) { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident"><span class="kw">crate</span>::test::rng</span>(<span class="number">807</span>); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="ident">zero</span>; <span class="number">5</span>]; |
| <span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="kw-2">&mut</span> <span class="ident">buf</span> { |
| <span class="kw-2">*</span><span class="ident">x</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">sample</span>(<span class="kw-2">&</span><span class="ident">distr</span>); |
| } |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span><span class="ident">buf</span>, <span class="ident">expected</span>); |
| } |
| |
| <span class="ident">test_samples</span>(<span class="kw-2">&</span><span class="ident">Standard</span>, <span class="string">'a'</span>, <span class="kw-2">&</span>[ |
| <span class="string">'\u{8cdac}'</span>, |
| <span class="string">'\u{a346a}'</span>, |
| <span class="string">'\u{80120}'</span>, |
| <span class="string">'\u{ed692}'</span>, |
| <span class="string">'\u{35888}'</span>, |
| ]); |
| <span class="ident">test_samples</span>(<span class="kw-2">&</span><span class="ident">Alphanumeric</span>, <span class="number">0</span>, <span class="kw-2">&</span>[<span class="number">104</span>, <span class="number">109</span>, <span class="number">101</span>, <span class="number">51</span>, <span class="number">77</span>]); |
| <span class="ident">test_samples</span>(<span class="kw-2">&</span><span class="ident">Standard</span>, <span class="bool-val">false</span>, <span class="kw-2">&</span>[<span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>]); |
| <span class="ident">test_samples</span>(<span class="kw-2">&</span><span class="ident">Standard</span>, <span class="prelude-val">None</span> <span class="kw">as</span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">bool</span><span class="op">></span>, <span class="kw-2">&</span>[ |
| <span class="prelude-val">Some</span>(<span class="bool-val">true</span>), |
| <span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>(<span class="bool-val">false</span>), |
| <span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>(<span class="bool-val">false</span>), |
| ]); |
| <span class="ident">test_samples</span>(<span class="kw-2">&</span><span class="ident">Standard</span>, <span class="ident">Wrapping</span>(<span class="number">0i32</span>), <span class="kw-2">&</span>[ |
| <span class="ident">Wrapping</span>(<span class="op">-</span><span class="number">2074640887</span>), |
| <span class="ident">Wrapping</span>(<span class="op">-</span><span class="number">1719949321</span>), |
| <span class="ident">Wrapping</span>(<span class="number">2018088303</span>), |
| <span class="ident">Wrapping</span>(<span class="op">-</span><span class="number">547181756</span>), |
| <span class="ident">Wrapping</span>(<span class="number">838957336</span>), |
| ]); |
| |
| <span class="comment">// We test only sub-sets of tuple and array impls</span> |
| <span class="ident">test_samples</span>(<span class="kw-2">&</span><span class="ident">Standard</span>, (), <span class="kw-2">&</span>[(), (), (), (), ()]); |
| <span class="ident">test_samples</span>(<span class="kw-2">&</span><span class="ident">Standard</span>, (<span class="bool-val">false</span>,), <span class="kw-2">&</span>[ |
| (<span class="bool-val">true</span>,), |
| (<span class="bool-val">true</span>,), |
| (<span class="bool-val">false</span>,), |
| (<span class="bool-val">true</span>,), |
| (<span class="bool-val">false</span>,), |
| ]); |
| <span class="ident">test_samples</span>(<span class="kw-2">&</span><span class="ident">Standard</span>, (<span class="bool-val">false</span>, <span class="bool-val">false</span>), <span class="kw-2">&</span>[ |
| (<span class="bool-val">true</span>, <span class="bool-val">true</span>), |
| (<span class="bool-val">false</span>, <span class="bool-val">true</span>), |
| (<span class="bool-val">false</span>, <span class="bool-val">false</span>), |
| (<span class="bool-val">true</span>, <span class="bool-val">false</span>), |
| (<span class="bool-val">false</span>, <span class="bool-val">false</span>), |
| ]); |
| |
| <span class="ident">test_samples</span>(<span class="kw-2">&</span><span class="ident">Standard</span>, [<span class="number">0u8</span>; <span class="number">0</span>], <span class="kw-2">&</span>[[], [], [], [], []]); |
| <span class="ident">test_samples</span>(<span class="kw-2">&</span><span class="ident">Standard</span>, [<span class="number">0u8</span>; <span class="number">3</span>], <span class="kw-2">&</span>[ |
| [<span class="number">9</span>, <span class="number">247</span>, <span class="number">111</span>], |
| [<span class="number">68</span>, <span class="number">24</span>, <span class="number">13</span>], |
| [<span class="number">174</span>, <span class="number">19</span>, <span class="number">194</span>], |
| [<span class="number">172</span>, <span class="number">69</span>, <span class="number">213</span>], |
| [<span class="number">149</span>, <span class="number">207</span>, <span class="number">29</span>], |
| ]); |
| } |
| } |
| </code></pre></div> |
| </section><section id="search" class="content hidden"></section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rand" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.60.0-nightly (1bd4fdc94 2022-01-12)" ></div> |
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