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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">//! Mock random number generator</span> |
| |
| <span class="kw">use</span> <span class="ident">rand_core</span>::{<span class="ident">impls</span>, <span class="ident">Error</span>, <span class="ident">RngCore</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="doccomment">/// A simple implementation of `RngCore` for testing purposes.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This generates an arithmetic sequence (i.e. adds a constant each step)</span> |
| <span class="doccomment">/// over a `u64` number, using wrapping arithmetic. If the increment is 0</span> |
| <span class="doccomment">/// the generator yields a constant.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// use rand::Rng;</span> |
| <span class="doccomment">/// use rand::rngs::mock::StepRng;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// let mut my_rng = StepRng::new(2, 1);</span> |
| <span class="doccomment">/// let sample: [u64; 3] = my_rng.gen();</span> |
| <span class="doccomment">/// assert_eq!(sample, [2, 3, 4]);</span> |
| <span class="doccomment">/// ```</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</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">StepRng</span> { |
| <span class="ident">v</span>: <span class="ident">u64</span>, |
| <span class="ident">a</span>: <span class="ident">u64</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">StepRng</span> { |
| <span class="doccomment">/// Create a `StepRng`, yielding an arithmetic sequence starting with</span> |
| <span class="doccomment">/// `initial` and incremented by `increment` each time.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">initial</span>: <span class="ident">u64</span>, <span class="ident">increment</span>: <span class="ident">u64</span>) -> <span class="self">Self</span> { |
| <span class="ident">StepRng</span> { |
| <span class="ident">v</span>: <span class="ident">initial</span>, |
| <span class="ident">a</span>: <span class="ident">increment</span>, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">RngCore</span> <span class="kw">for</span> <span class="ident">StepRng</span> { |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">next_u32</span>(<span class="kw-2">&mut</span> <span class="self">self</span>) -> <span class="ident">u32</span> { |
| <span class="self">self</span>.<span class="ident">next_u64</span>() <span class="kw">as</span> <span class="ident">u32</span> |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">next_u64</span>(<span class="kw-2">&mut</span> <span class="self">self</span>) -> <span class="ident">u64</span> { |
| <span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">v</span>; |
| <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">wrapping_add</span>(<span class="self">self</span>.<span class="ident">a</span>); |
| <span class="ident">result</span> |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">fill_bytes</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">dest</span>: <span class="kw-2">&mut</span> [<span class="ident">u8</span>]) { |
| <span class="ident">impls::fill_bytes_via_next</span>(<span class="self">self</span>, <span class="ident">dest</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">inline</span>]</span> |
| <span class="kw">fn</span> <span class="ident">try_fill_bytes</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">dest</span>: <span class="kw-2">&mut</span> [<span class="ident">u8</span>]) -> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">Error</span><span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">fill_bytes</span>(<span class="ident">dest</span>); |
| <span class="prelude-val">Ok</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="attribute">#[<span class="ident">test</span>]</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">fn</span> <span class="ident">test_serialization_step_rng</span>() { |
| <span class="kw">use</span> <span class="ident"><span class="kw">super</span>::StepRng</span>; |
| |
| <span class="kw">let</span> <span class="ident">some_rng</span> <span class="op">=</span> <span class="ident">StepRng::new</span>(<span class="number">42</span>, <span class="number">7</span>); |
| <span class="kw">let</span> <span class="ident">de_some_rng</span>: <span class="ident">StepRng</span> <span class="op">=</span> |
| <span class="ident">bincode::deserialize</span>(<span class="kw-2">&</span><span class="ident">bincode::serialize</span>(<span class="kw-2">&</span><span class="ident">some_rng</span>).<span class="ident">unwrap</span>()).<span class="ident">unwrap</span>(); |
| <span class="macro">assert_eq!</span>(<span class="ident">some_rng</span>.<span class="ident">v</span>, <span class="ident">de_some_rng</span>.<span class="ident">v</span>); |
| <span class="macro">assert_eq!</span>(<span class="ident">some_rng</span>.<span class="ident">a</span>, <span class="ident">de_some_rng</span>.<span class="ident">a</span>); |
| |
| } |
| } |
| </code></pre></div> |
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