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</pre><pre class="rust ">
<span class="comment">// Copyright 2013 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">//! The ISAAC-64 random number generator.</span>
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">slice</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">iter</span>::<span class="ident">repeat</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">num</span>::<span class="ident">Wrapping</span> <span class="kw">as</span> <span class="ident">w</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">fmt</span>;
<span class="kw">use</span> {<span class="ident">Rng</span>, <span class="ident">SeedableRng</span>, <span class="ident">Rand</span>};
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">bad_style</span>)]</span>
<span class="kw">type</span> <span class="ident">w64</span> <span class="op">=</span> <span class="ident">w</span><span class="op"><</span><span class="ident">u64</span><span class="op">></span>;
<span class="kw">const</span> <span class="ident">RAND_SIZE_64_LEN</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">8</span>;
<span class="kw">const</span> <span class="ident">RAND_SIZE_64</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><<</span> <span class="ident">RAND_SIZE_64_LEN</span>;
<span class="doccomment">/// A random number generator that uses ISAAC-64[1], the 64-bit</span>
<span class="doccomment">/// variant of the ISAAC algorithm.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The ISAAC algorithm is generally accepted as suitable for</span>
<span class="doccomment">/// cryptographic purposes, but this implementation has not be</span>
<span class="doccomment">/// verified as such. Prefer a generator like `OsRng` that defers to</span>
<span class="doccomment">/// the operating system for cases that need high security.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [1]: Bob Jenkins, [*ISAAC: A fast cryptographic random number</span>
<span class="doccomment">/// generator*](http://www.burtleburtle.net/bob/rand/isaacafa.html)</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Isaac64Rng</span> {
<span class="ident">cnt</span>: <span class="ident">usize</span>,
<span class="ident">rsl</span>: [<span class="ident">w64</span>; <span class="ident">RAND_SIZE_64</span>],
<span class="ident">mem</span>: [<span class="ident">w64</span>; <span class="ident">RAND_SIZE_64</span>],
<span class="ident">a</span>: <span class="ident">w64</span>,
<span class="ident">b</span>: <span class="ident">w64</span>,
<span class="ident">c</span>: <span class="ident">w64</span>,
}
<span class="kw">static</span> <span class="ident">EMPTY_64</span>: <span class="ident">Isaac64Rng</span> <span class="op">=</span> <span class="ident">Isaac64Rng</span> {
<span class="ident">cnt</span>: <span class="number">0</span>,
<span class="ident">rsl</span>: [<span class="ident">w</span>(<span class="number">0</span>); <span class="ident">RAND_SIZE_64</span>],
<span class="ident">mem</span>: [<span class="ident">w</span>(<span class="number">0</span>); <span class="ident">RAND_SIZE_64</span>],
<span class="ident">a</span>: <span class="ident">w</span>(<span class="number">0</span>), <span class="ident">b</span>: <span class="ident">w</span>(<span class="number">0</span>), <span class="ident">c</span>: <span class="ident">w</span>(<span class="number">0</span>),
};
<span class="kw">impl</span> <span class="ident">Isaac64Rng</span> {
<span class="doccomment">/// Create a 64-bit ISAAC random number generator using the</span>
<span class="doccomment">/// default fixed seed.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_unseeded</span>() <span class="op">-></span> <span class="ident">Isaac64Rng</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">EMPTY_64</span>;
<span class="ident">rng</span>.<span class="ident">init</span>(<span class="bool-val">false</span>);
<span class="ident">rng</span>
}
<span class="doccomment">/// Initialises `self`. If `use_rsl` is true, then use the current value</span>
<span class="doccomment">/// of `rsl` as a seed, otherwise construct one algorithmically (not</span>
<span class="doccomment">/// randomly).</span>
<span class="kw">fn</span> <span class="ident">init</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">use_rsl</span>: <span class="ident">bool</span>) {
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">init</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">var</span>:<span class="ident">ident</span>) <span class="op">=></span> (
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">var</span> <span class="op">=</span> <span class="ident">w</span>(<span class="number">0x9e3779b97f4a7c13</span>);
)
}
<span class="macro">init</span><span class="macro">!</span>(<span class="ident">a</span>); <span class="macro">init</span><span class="macro">!</span>(<span class="ident">b</span>); <span class="macro">init</span><span class="macro">!</span>(<span class="ident">c</span>); <span class="macro">init</span><span class="macro">!</span>(<span class="ident">d</span>);
<span class="macro">init</span><span class="macro">!</span>(<span class="ident">e</span>); <span class="macro">init</span><span class="macro">!</span>(<span class="ident">f</span>); <span class="macro">init</span><span class="macro">!</span>(<span class="ident">g</span>); <span class="macro">init</span><span class="macro">!</span>(<span class="ident">h</span>);
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">mix</span> {
() <span class="op">=></span> {{
<span class="ident">a</span><span class="op">=</span><span class="ident">a</span><span class="op">-</span><span class="ident">e</span>; <span class="ident">f</span><span class="op">=</span><span class="ident">f</span><span class="op">^</span>(<span class="ident">h</span><span class="op">>></span><span class="number">9</span>); <span class="ident">h</span><span class="op">=</span><span class="ident">h</span><span class="op">+</span><span class="ident">a</span>;
<span class="ident">b</span><span class="op">=</span><span class="ident">b</span><span class="op">-</span><span class="ident">f</span>; <span class="ident">g</span><span class="op">=</span><span class="ident">g</span><span class="op">^</span>(<span class="ident">a</span><span class="op"><<</span><span class="number">9</span>); <span class="ident">a</span><span class="op">=</span><span class="ident">a</span><span class="op">+</span><span class="ident">b</span>;
<span class="ident">c</span><span class="op">=</span><span class="ident">c</span><span class="op">-</span><span class="ident">g</span>; <span class="ident">h</span><span class="op">=</span><span class="ident">h</span><span class="op">^</span>(<span class="ident">b</span><span class="op">>></span><span class="number">23</span>); <span class="ident">b</span><span class="op">=</span><span class="ident">b</span><span class="op">+</span><span class="ident">c</span>;
<span class="ident">d</span><span class="op">=</span><span class="ident">d</span><span class="op">-</span><span class="ident">h</span>; <span class="ident">a</span><span class="op">=</span><span class="ident">a</span><span class="op">^</span>(<span class="ident">c</span><span class="op"><<</span><span class="number">15</span>); <span class="ident">c</span><span class="op">=</span><span class="ident">c</span><span class="op">+</span><span class="ident">d</span>;
<span class="ident">e</span><span class="op">=</span><span class="ident">e</span><span class="op">-</span><span class="ident">a</span>; <span class="ident">b</span><span class="op">=</span><span class="ident">b</span><span class="op">^</span>(<span class="ident">d</span><span class="op">>></span><span class="number">14</span>); <span class="ident">d</span><span class="op">=</span><span class="ident">d</span><span class="op">+</span><span class="ident">e</span>;
<span class="ident">f</span><span class="op">=</span><span class="ident">f</span><span class="op">-</span><span class="ident">b</span>; <span class="ident">c</span><span class="op">=</span><span class="ident">c</span><span class="op">^</span>(<span class="ident">e</span><span class="op"><<</span><span class="number">20</span>); <span class="ident">e</span><span class="op">=</span><span class="ident">e</span><span class="op">+</span><span class="ident">f</span>;
<span class="ident">g</span><span class="op">=</span><span class="ident">g</span><span class="op">-</span><span class="ident">c</span>; <span class="ident">d</span><span class="op">=</span><span class="ident">d</span><span class="op">^</span>(<span class="ident">f</span><span class="op">>></span><span class="number">17</span>); <span class="ident">f</span><span class="op">=</span><span class="ident">f</span><span class="op">+</span><span class="ident">g</span>;
<span class="ident">h</span><span class="op">=</span><span class="ident">h</span><span class="op">-</span><span class="ident">d</span>; <span class="ident">e</span><span class="op">=</span><span class="ident">e</span><span class="op">^</span>(<span class="ident">g</span><span class="op"><<</span><span class="number">14</span>); <span class="ident">g</span><span class="op">=</span><span class="ident">g</span><span class="op">+</span><span class="ident">h</span>;
}}
}
<span class="kw">for</span> _ <span class="kw">in</span> <span class="number">0</span>..<span class="number">4</span> {
<span class="macro">mix</span><span class="macro">!</span>();
}
<span class="kw">if</span> <span class="ident">use_rsl</span> {
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">memloop</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>:<span class="ident">expr</span>) <span class="op">=></span> {{
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> (<span class="number">0</span>..<span class="ident">RAND_SIZE_64</span> <span class="op">/</span> <span class="number">8</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> <span class="ident">i</span> <span class="op">*</span> <span class="number">8</span>) {
<span class="ident">a</span><span class="op">=</span><span class="ident">a</span><span class="op">+</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>[<span class="ident">i</span> ]; <span class="ident">b</span><span class="op">=</span><span class="ident">b</span><span class="op">+</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>[<span class="ident">i</span><span class="op">+</span><span class="number">1</span>];
<span class="ident">c</span><span class="op">=</span><span class="ident">c</span><span class="op">+</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>[<span class="ident">i</span><span class="op">+</span><span class="number">2</span>]; <span class="ident">d</span><span class="op">=</span><span class="ident">d</span><span class="op">+</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>[<span class="ident">i</span><span class="op">+</span><span class="number">3</span>];
<span class="ident">e</span><span class="op">=</span><span class="ident">e</span><span class="op">+</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>[<span class="ident">i</span><span class="op">+</span><span class="number">4</span>]; <span class="ident">f</span><span class="op">=</span><span class="ident">f</span><span class="op">+</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>[<span class="ident">i</span><span class="op">+</span><span class="number">5</span>];
<span class="ident">g</span><span class="op">=</span><span class="ident">g</span><span class="op">+</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>[<span class="ident">i</span><span class="op">+</span><span class="number">6</span>]; <span class="ident">h</span><span class="op">=</span><span class="ident">h</span><span class="op">+</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">arr</span>[<span class="ident">i</span><span class="op">+</span><span class="number">7</span>];
<span class="macro">mix</span><span class="macro">!</span>();
<span class="self">self</span>.<span class="ident">mem</span>[<span class="ident">i</span> ]<span class="op">=</span><span class="ident">a</span>; <span class="self">self</span>.<span class="ident">mem</span>[<span class="ident">i</span><span class="op">+</span><span class="number">1</span>]<span class="op">=</span><span class="ident">b</span>;
<span class="self">self</span>.<span class="ident">mem</span>[<span class="ident">i</span><span class="op">+</span><span class="number">2</span>]<span class="op">=</span><span class="ident">c</span>; <span class="self">self</span>.<span class="ident">mem</span>[<span class="ident">i</span><span class="op">+</span><span class="number">3</span>]<span class="op">=</span><span class="ident">d</span>;
<span class="self">self</span>.<span class="ident">mem</span>[<span class="ident">i</span><span class="op">+</span><span class="number">4</span>]<span class="op">=</span><span class="ident">e</span>; <span class="self">self</span>.<span class="ident">mem</span>[<span class="ident">i</span><span class="op">+</span><span class="number">5</span>]<span class="op">=</span><span class="ident">f</span>;
<span class="self">self</span>.<span class="ident">mem</span>[<span class="ident">i</span><span class="op">+</span><span class="number">6</span>]<span class="op">=</span><span class="ident">g</span>; <span class="self">self</span>.<span class="ident">mem</span>[<span class="ident">i</span><span class="op">+</span><span class="number">7</span>]<span class="op">=</span><span class="ident">h</span>;
}
}}
}
<span class="macro">memloop</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">rsl</span>);
<span class="macro">memloop</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">mem</span>);
} <span class="kw">else</span> {
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> (<span class="number">0</span>..<span class="ident">RAND_SIZE_64</span> <span class="op">/</span> <span class="number">8</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> <span class="ident">i</span> <span class="op">*</span> <span class="number">8</span>) {
<span class="macro">mix</span><span class="macro">!</span>();
<span class="self">self</span>.<span class="ident">mem</span>[<span class="ident">i</span> ]<span class="op">=</span><span class="ident">a</span>; <span class="self">self</span>.<span class="ident">mem</span>[<span class="ident">i</span><span class="op">+</span><span class="number">1</span>]<span class="op">=</span><span class="ident">b</span>;
<span class="self">self</span>.<span class="ident">mem</span>[<span class="ident">i</span><span class="op">+</span><span class="number">2</span>]<span class="op">=</span><span class="ident">c</span>; <span class="self">self</span>.<span class="ident">mem</span>[<span class="ident">i</span><span class="op">+</span><span class="number">3</span>]<span class="op">=</span><span class="ident">d</span>;
<span class="self">self</span>.<span class="ident">mem</span>[<span class="ident">i</span><span class="op">+</span><span class="number">4</span>]<span class="op">=</span><span class="ident">e</span>; <span class="self">self</span>.<span class="ident">mem</span>[<span class="ident">i</span><span class="op">+</span><span class="number">5</span>]<span class="op">=</span><span class="ident">f</span>;
<span class="self">self</span>.<span class="ident">mem</span>[<span class="ident">i</span><span class="op">+</span><span class="number">6</span>]<span class="op">=</span><span class="ident">g</span>; <span class="self">self</span>.<span class="ident">mem</span>[<span class="ident">i</span><span class="op">+</span><span class="number">7</span>]<span class="op">=</span><span class="ident">h</span>;
}
}
<span class="self">self</span>.<span class="ident">isaac64</span>();
}
<span class="doccomment">/// Refills the output buffer (`self.rsl`)</span>
<span class="kw">fn</span> <span class="ident">isaac64</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="self">self</span>.<span class="ident">c</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">c</span> <span class="op">+</span> <span class="ident">w</span>(<span class="number">1</span>);
<span class="comment">// abbreviations</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">a</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">b</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">c</span>;
<span class="kw">const</span> <span class="ident">MIDPOINT</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="ident">RAND_SIZE_64</span> <span class="op">/</span> <span class="number">2</span>;
<span class="kw">const</span> <span class="ident">MP_VEC</span>: [(<span class="ident">usize</span>, <span class="ident">usize</span>); <span class="number">2</span>] <span class="op">=</span> [(<span class="number">0</span>,<span class="ident">MIDPOINT</span>), (<span class="ident">MIDPOINT</span>, <span class="number">0</span>)];
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">ind</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">expr</span>) <span class="op">=></span> {
<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">mem</span>.<span class="ident">get_unchecked</span>(((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span> <span class="op">>></span> <span class="number">3usize</span>).<span class="number">0</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op">&</span> (<span class="ident">RAND_SIZE_64</span> <span class="op">-</span> <span class="number">1</span>))
}
}
<span class="kw">for</span> <span class="kw-2">&</span>(<span class="ident">mr_offset</span>, <span class="ident">m2_offset</span>) <span class="kw">in</span> <span class="ident">MP_VEC</span>.<span class="ident">iter</span>() {
<span class="kw">for</span> <span class="ident">base</span> <span class="kw">in</span> (<span class="number">0</span>..<span class="ident">MIDPOINT</span> <span class="op">/</span> <span class="number">4</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> <span class="ident">i</span> <span class="op">*</span> <span class="number">4</span>) {
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">rngstepp</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">j</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">shift</span>:<span class="ident">expr</span>) <span class="op">=></span> {{
<span class="kw">let</span> <span class="ident">base</span> <span class="op">=</span> <span class="ident">base</span> <span class="op">+</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">j</span>;
<span class="kw">let</span> <span class="ident">mix</span> <span class="op">=</span> <span class="ident">a</span> <span class="op">^</span> (<span class="ident">a</span> <span class="op"><<</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">shift</span>);
<span class="kw">let</span> <span class="ident">mix</span> <span class="op">=</span> <span class="kw">if</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">j</span> <span class="op">==</span> <span class="number">0</span> {<span class="op">!</span><span class="ident">mix</span>} <span class="kw">else</span> {<span class="ident">mix</span>};
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">mem</span>.<span class="ident">get_unchecked</span>(<span class="ident">base</span> <span class="op">+</span> <span class="ident">mr_offset</span>);
<span class="ident">a</span> <span class="op">=</span> <span class="ident">mix</span> <span class="op">+</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">mem</span>.<span class="ident">get_unchecked</span>(<span class="ident">base</span> <span class="op">+</span> <span class="ident">m2_offset</span>);
<span class="kw">let</span> <span class="ident">y</span> <span class="op">=</span> <span class="macro">ind</span><span class="macro">!</span>(<span class="ident">x</span>) <span class="op">+</span> <span class="ident">a</span> <span class="op">+</span> <span class="ident">b</span>;
<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">mem</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">base</span> <span class="op">+</span> <span class="ident">mr_offset</span>) <span class="op">=</span> <span class="ident">y</span>;
<span class="ident">b</span> <span class="op">=</span> <span class="macro">ind</span><span class="macro">!</span>(<span class="ident">y</span> <span class="op">>></span> <span class="ident">RAND_SIZE_64_LEN</span>) <span class="op">+</span> <span class="ident">x</span>;
<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">rsl</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">base</span> <span class="op">+</span> <span class="ident">mr_offset</span>) <span class="op">=</span> <span class="ident">b</span>;
}
}}
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">rngstepn</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">j</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">shift</span>:<span class="ident">expr</span>) <span class="op">=></span> {{
<span class="kw">let</span> <span class="ident">base</span> <span class="op">=</span> <span class="ident">base</span> <span class="op">+</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">j</span>;
<span class="kw">let</span> <span class="ident">mix</span> <span class="op">=</span> <span class="ident">a</span> <span class="op">^</span> (<span class="ident">a</span> <span class="op">>></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">shift</span>);
<span class="kw">let</span> <span class="ident">mix</span> <span class="op">=</span> <span class="kw">if</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">j</span> <span class="op">==</span> <span class="number">0</span> {<span class="op">!</span><span class="ident">mix</span>} <span class="kw">else</span> {<span class="ident">mix</span>};
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">mem</span>.<span class="ident">get_unchecked</span>(<span class="ident">base</span> <span class="op">+</span> <span class="ident">mr_offset</span>);
<span class="ident">a</span> <span class="op">=</span> <span class="ident">mix</span> <span class="op">+</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">mem</span>.<span class="ident">get_unchecked</span>(<span class="ident">base</span> <span class="op">+</span> <span class="ident">m2_offset</span>);
<span class="kw">let</span> <span class="ident">y</span> <span class="op">=</span> <span class="macro">ind</span><span class="macro">!</span>(<span class="ident">x</span>) <span class="op">+</span> <span class="ident">a</span> <span class="op">+</span> <span class="ident">b</span>;
<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">mem</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">base</span> <span class="op">+</span> <span class="ident">mr_offset</span>) <span class="op">=</span> <span class="ident">y</span>;
<span class="ident">b</span> <span class="op">=</span> <span class="macro">ind</span><span class="macro">!</span>(<span class="ident">y</span> <span class="op">>></span> <span class="ident">RAND_SIZE_64_LEN</span>) <span class="op">+</span> <span class="ident">x</span>;
<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">rsl</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">base</span> <span class="op">+</span> <span class="ident">mr_offset</span>) <span class="op">=</span> <span class="ident">b</span>;
}
}}
}
<span class="macro">rngstepp</span><span class="macro">!</span>(<span class="number">0</span>, <span class="number">21</span>);
<span class="macro">rngstepn</span><span class="macro">!</span>(<span class="number">1</span>, <span class="number">5</span>);
<span class="macro">rngstepp</span><span class="macro">!</span>(<span class="number">2</span>, <span class="number">12</span>);
<span class="macro">rngstepn</span><span class="macro">!</span>(<span class="number">3</span>, <span class="number">33</span>);
}
}
<span class="self">self</span>.<span class="ident">a</span> <span class="op">=</span> <span class="ident">a</span>;
<span class="self">self</span>.<span class="ident">b</span> <span class="op">=</span> <span class="ident">b</span>;
<span class="self">self</span>.<span class="ident">cnt</span> <span class="op">=</span> <span class="ident">RAND_SIZE_64</span>;
}
}
<span class="comment">// Cannot be derived because [u32; 256] does not implement Clone</span>
<span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Isaac64Rng</span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Isaac64Rng</span> {
<span class="kw-2">*</span><span class="self">self</span>
}
}
<span class="kw">impl</span> <span class="ident">Rng</span> <span class="kw">for</span> <span class="ident">Isaac64Rng</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">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></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">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">u64</span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">cnt</span> <span class="op">==</span> <span class="number">0</span> {
<span class="comment">// make some more numbers</span>
<span class="self">self</span>.<span class="ident">isaac64</span>();
}
<span class="self">self</span>.<span class="ident">cnt</span> <span class="op">-=</span> <span class="number">1</span>;
<span class="comment">// See corresponding location in IsaacRng.next_u32 for</span>
<span class="comment">// explanation.</span>
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">cnt</span> <span class="op"><</span> <span class="ident">RAND_SIZE_64</span>);
<span class="self">self</span>.<span class="ident">rsl</span>[(<span class="self">self</span>.<span class="ident">cnt</span> <span class="op">%</span> <span class="ident">RAND_SIZE_64</span>) <span class="kw">as</span> <span class="ident">usize</span>].<span class="number">0</span>
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">SeedableRng</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">u64</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">Isaac64Rng</span> {
<span class="kw">fn</span> <span class="ident">reseed</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">seed</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">u64</span>]) {
<span class="comment">// make the seed into [seed[0], seed[1], ..., seed[seed.len()</span>
<span class="comment">// - 1], 0, 0, ...], to fill rng.rsl.</span>
<span class="kw">let</span> <span class="ident">seed_iter</span> <span class="op">=</span> <span class="ident">seed</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>).<span class="ident">chain</span>(<span class="ident">repeat</span>(<span class="number">0u64</span>));
<span class="kw">for</span> (<span class="ident">rsl_elem</span>, <span class="ident">seed_elem</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">rsl</span>.<span class="ident">iter_mut</span>().<span class="ident">zip</span>(<span class="ident">seed_iter</span>) {
<span class="kw-2">*</span><span class="ident">rsl_elem</span> <span class="op">=</span> <span class="ident">w</span>(<span class="ident">seed_elem</span>);
}
<span class="self">self</span>.<span class="ident">cnt</span> <span class="op">=</span> <span class="number">0</span>;
<span class="self">self</span>.<span class="ident">a</span> <span class="op">=</span> <span class="ident">w</span>(<span class="number">0</span>);
<span class="self">self</span>.<span class="ident">b</span> <span class="op">=</span> <span class="ident">w</span>(<span class="number">0</span>);
<span class="self">self</span>.<span class="ident">c</span> <span class="op">=</span> <span class="ident">w</span>(<span class="number">0</span>);
<span class="self">self</span>.<span class="ident">init</span>(<span class="bool-val">true</span>);
}
<span class="doccomment">/// Create an ISAAC random number generator with a seed. This can</span>
<span class="doccomment">/// be any length, although the maximum number of elements used is</span>
<span class="doccomment">/// 256 and any more will be silently ignored. A generator</span>
<span class="doccomment">/// constructed with a given seed will generate the same sequence</span>
<span class="doccomment">/// of values as all other generators constructed with that seed.</span>
<span class="kw">fn</span> <span class="ident">from_seed</span>(<span class="ident">seed</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">u64</span>]) <span class="op">-></span> <span class="ident">Isaac64Rng</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">EMPTY_64</span>;
<span class="ident">rng</span>.<span class="ident">reseed</span>(<span class="ident">seed</span>);
<span class="ident">rng</span>
}
}
<span class="kw">impl</span> <span class="ident">Rand</span> <span class="kw">for</span> <span class="ident">Isaac64Rng</span> {
<span class="kw">fn</span> <span class="ident">rand</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Rng</span><span class="op">></span>(<span class="ident">other</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">R</span>) <span class="op">-></span> <span class="ident">Isaac64Rng</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">EMPTY_64</span>;
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="ident">ret</span>.<span class="ident">rsl</span>.<span class="ident">as_mut_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>;
<span class="kw">let</span> <span class="ident">slice</span> <span class="op">=</span> <span class="ident">slice</span>::<span class="ident">from_raw_parts_mut</span>(<span class="ident">ptr</span>, <span class="ident">RAND_SIZE_64</span> <span class="op">*</span> <span class="number">8</span>);
<span class="ident">other</span>.<span class="ident">fill_bytes</span>(<span class="ident">slice</span>);
}
<span class="ident">ret</span>.<span class="ident">cnt</span> <span class="op">=</span> <span class="number">0</span>;
<span class="ident">ret</span>.<span class="ident">a</span> <span class="op">=</span> <span class="ident">w</span>(<span class="number">0</span>);
<span class="ident">ret</span>.<span class="ident">b</span> <span class="op">=</span> <span class="ident">w</span>(<span class="number">0</span>);
<span class="ident">ret</span>.<span class="ident">c</span> <span class="op">=</span> <span class="ident">w</span>(<span class="number">0</span>);
<span class="ident">ret</span>.<span class="ident">init</span>(<span class="bool-val">true</span>);
<span class="kw">return</span> <span class="ident">ret</span>;
}
}
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Isaac64Rng</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">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"Isaac64Rng {{}}"</span>)
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">test</span> {
<span class="kw">use</span> {<span class="ident">Rng</span>, <span class="ident">SeedableRng</span>};
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">Isaac64Rng</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_rng_64_rand_seeded</span>() {
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> ::<span class="ident">test</span>::<span class="ident">rng</span>().<span class="ident">gen_iter</span>::<span class="op"><</span><span class="ident">u64</span><span class="op">></span>().<span class="ident">take</span>(<span class="number">256</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">u64</span><span class="op">>></span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ra</span>: <span class="ident">Isaac64Rng</span> <span class="op">=</span> <span class="ident">SeedableRng</span>::<span class="ident">from_seed</span>(<span class="kw-2">&</span><span class="ident">s</span>[..]);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rb</span>: <span class="ident">Isaac64Rng</span> <span class="op">=</span> <span class="ident">SeedableRng</span>::<span class="ident">from_seed</span>(<span class="kw-2">&</span><span class="ident">s</span>[..]);
<span class="macro">assert</span><span class="macro">!</span>(::<span class="ident">test</span>::<span class="ident">iter_eq</span>(<span class="ident">ra</span>.<span class="ident">gen_ascii_chars</span>().<span class="ident">take</span>(<span class="number">100</span>),
<span class="ident">rb</span>.<span class="ident">gen_ascii_chars</span>().<span class="ident">take</span>(<span class="number">100</span>)));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_rng_64_seeded</span>() {
<span class="kw">let</span> <span class="ident">seed</span>: <span class="kw-2">&</span>[_] <span class="op">=</span> <span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">23</span>, <span class="number">456</span>, <span class="number">7890</span>, <span class="number">12345</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ra</span>: <span class="ident">Isaac64Rng</span> <span class="op">=</span> <span class="ident">SeedableRng</span>::<span class="ident">from_seed</span>(<span class="ident">seed</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rb</span>: <span class="ident">Isaac64Rng</span> <span class="op">=</span> <span class="ident">SeedableRng</span>::<span class="ident">from_seed</span>(<span class="ident">seed</span>);
<span class="macro">assert</span><span class="macro">!</span>(::<span class="ident">test</span>::<span class="ident">iter_eq</span>(<span class="ident">ra</span>.<span class="ident">gen_ascii_chars</span>().<span class="ident">take</span>(<span class="number">100</span>),
<span class="ident">rb</span>.<span class="ident">gen_ascii_chars</span>().<span class="ident">take</span>(<span class="number">100</span>)));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_rng_64_reseed</span>() {
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> ::<span class="ident">test</span>::<span class="ident">rng</span>().<span class="ident">gen_iter</span>::<span class="op"><</span><span class="ident">u64</span><span class="op">></span>().<span class="ident">take</span>(<span class="number">256</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">u64</span><span class="op">>></span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span>: <span class="ident">Isaac64Rng</span> <span class="op">=</span> <span class="ident">SeedableRng</span>::<span class="ident">from_seed</span>(<span class="kw-2">&</span><span class="ident">s</span>[..]);
<span class="kw">let</span> <span class="ident">string1</span>: <span class="ident">String</span> <span class="op">=</span> <span class="ident">r</span>.<span class="ident">gen_ascii_chars</span>().<span class="ident">take</span>(<span class="number">100</span>).<span class="ident">collect</span>();
<span class="ident">r</span>.<span class="ident">reseed</span>(<span class="kw-2">&</span><span class="ident">s</span>[..]);
<span class="kw">let</span> <span class="ident">string2</span>: <span class="ident">String</span> <span class="op">=</span> <span class="ident">r</span>.<span class="ident">gen_ascii_chars</span>().<span class="ident">take</span>(<span class="number">100</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">string1</span>, <span class="ident">string2</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_rng_64_true_values</span>() {
<span class="kw">let</span> <span class="ident">seed</span>: <span class="kw-2">&</span>[_] <span class="op">=</span> <span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">23</span>, <span class="number">456</span>, <span class="number">7890</span>, <span class="number">12345</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ra</span>: <span class="ident">Isaac64Rng</span> <span class="op">=</span> <span class="ident">SeedableRng</span>::<span class="ident">from_seed</span>(<span class="ident">seed</span>);
<span class="comment">// Regression test that isaac is actually using the above vector</span>
<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> (<span class="number">0</span>..<span class="number">10</span>).<span class="ident">map</span>(<span class="op">|</span>_<span class="op">|</span> <span class="ident">ra</span>.<span class="ident">next_u64</span>()).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span>_<span class="op">>></span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>,
<span class="macro">vec</span><span class="macro">!</span>(<span class="number">547121783600835980</span>, <span class="number">14377643087320773276</span>, <span class="number">17351601304698403469</span>,
<span class="number">1238879483818134882</span>, <span class="number">11952566807690396487</span>, <span class="number">13970131091560099343</span>,
<span class="number">4469761996653280935</span>, <span class="number">15552757044682284409</span>, <span class="number">6860251611068737823</span>,
<span class="number">13722198873481261842</span>));
<span class="kw">let</span> <span class="ident">seed</span>: <span class="kw-2">&</span>[_] <span class="op">=</span> <span class="kw-2">&</span>[<span class="number">12345</span>, <span class="number">67890</span>, <span class="number">54321</span>, <span class="number">9876</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rb</span>: <span class="ident">Isaac64Rng</span> <span class="op">=</span> <span class="ident">SeedableRng</span>::<span class="ident">from_seed</span>(<span class="ident">seed</span>);
<span class="comment">// skip forward to the 10000th number</span>
<span class="kw">for</span> _ <span class="kw">in</span> <span class="number">0</span>..<span class="number">10000</span> { <span class="ident">rb</span>.<span class="ident">next_u64</span>(); }
<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> (<span class="number">0</span>..<span class="number">10</span>).<span class="ident">map</span>(<span class="op">|</span>_<span class="op">|</span> <span class="ident">rb</span>.<span class="ident">next_u64</span>()).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span>_<span class="op">>></span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>,
<span class="macro">vec</span><span class="macro">!</span>(<span class="number">18143823860592706164</span>, <span class="number">8491801882678285927</span>, <span class="number">2699425367717515619</span>,
<span class="number">17196852593171130876</span>, <span class="number">2606123525235546165</span>, <span class="number">15790932315217671084</span>,
<span class="number">596345674630742204</span>, <span class="number">9947027391921273664</span>, <span class="number">11788097613744130851</span>,
<span class="number">10391409374914919106</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_rng_clone</span>() {
<span class="kw">let</span> <span class="ident">seed</span>: <span class="kw-2">&</span>[_] <span class="op">=</span> <span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">23</span>, <span class="number">456</span>, <span class="number">7890</span>, <span class="number">12345</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span>: <span class="ident">Isaac64Rng</span> <span class="op">=</span> <span class="ident">SeedableRng</span>::<span class="ident">from_seed</span>(<span class="ident">seed</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">clone</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">clone</span>();
<span class="kw">for</span> _ <span class="kw">in</span> <span class="number">0</span>..<span class="number">16</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rng</span>.<span class="ident">next_u64</span>(), <span class="ident">clone</span>.<span class="ident">next_u64</span>());
}
}
}
</pre>
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