| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/sunhe/incubator-teaclave/third_party/rust-sgx-sdk/sgx_rand/src/rand_impls.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>rand_impls.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../sgx_rand/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../sgx_rand/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="comment">// Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License.. |
| |
| </span><span class="doccomment">//! The implementations of `Rand` for the built-in types. |
| |
| </span><span class="kw">use </span>std::char; |
| <span class="kw">use </span>std::mem; |
| |
| <span class="kw">use crate</span>::{Rand, Rng}; |
| |
| <span class="kw">impl </span>Rand <span class="kw">for </span>isize { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> isize { |
| <span class="kw">if </span>mem::size_of::<isize>() == <span class="number">4 </span>{ |
| rng.gen::<i32>() <span class="kw">as </span>isize |
| } <span class="kw">else </span>{ |
| rng.gen::<i64>() <span class="kw">as </span>isize |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Rand <span class="kw">for </span>i8 { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> i8 { |
| rng.next_u32() <span class="kw">as </span>i8 |
| } |
| } |
| |
| <span class="kw">impl </span>Rand <span class="kw">for </span>i16 { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> i16 { |
| rng.next_u32() <span class="kw">as </span>i16 |
| } |
| } |
| |
| <span class="kw">impl </span>Rand <span class="kw">for </span>i32 { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> i32 { |
| rng.next_u32() <span class="kw">as </span>i32 |
| } |
| } |
| |
| <span class="kw">impl </span>Rand <span class="kw">for </span>i64 { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> i64 { |
| rng.next_u64() <span class="kw">as </span>i64 |
| } |
| } |
| |
| <span class="kw">impl </span>Rand <span class="kw">for </span>i128 { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> i128 { |
| rng.gen::<u128>() <span class="kw">as </span>i128 |
| } |
| } |
| |
| <span class="kw">impl </span>Rand <span class="kw">for </span>usize { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> usize { |
| <span class="kw">if </span>mem::size_of::<usize>() == <span class="number">4 </span>{ |
| rng.gen::<u32>() <span class="kw">as </span>usize |
| } <span class="kw">else </span>{ |
| rng.gen::<u64>() <span class="kw">as </span>usize |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Rand <span class="kw">for </span>u8 { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> u8 { |
| rng.next_u32() <span class="kw">as </span>u8 |
| } |
| } |
| |
| <span class="kw">impl </span>Rand <span class="kw">for </span>u16 { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> u16 { |
| rng.next_u32() <span class="kw">as </span>u16 |
| } |
| } |
| |
| <span class="kw">impl </span>Rand <span class="kw">for </span>u32 { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> u32 { |
| rng.next_u32() |
| } |
| } |
| |
| <span class="kw">impl </span>Rand <span class="kw">for </span>u64 { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> u64 { |
| rng.next_u64() |
| } |
| } |
| |
| <span class="kw">impl </span>Rand <span class="kw">for </span>u128 { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> u128 { |
| ((rng.next_u64() <span class="kw">as </span>u128) << <span class="number">64</span>) | (rng.next_u64() <span class="kw">as </span>u128) |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>float_impls { |
| (<span class="macro-nonterminal">$mod_name</span>:ident, <span class="macro-nonterminal">$ty</span>:ty, <span class="macro-nonterminal">$mantissa_bits</span>:expr, <span class="macro-nonterminal">$method_name</span>:ident) => { |
| <span class="kw">mod </span><span class="macro-nonterminal">$mod_name </span>{ |
| <span class="kw">use crate</span>::{Closed01, Open01, Rand, Rng}; |
| |
| <span class="kw">const </span>SCALE: <span class="macro-nonterminal">$ty </span>= (<span class="number">1u64 </span><< <span class="macro-nonterminal">$mantissa_bits</span>) <span class="kw">as </span><span class="macro-nonterminal">$ty</span>; |
| |
| <span class="kw">impl </span>Rand <span class="kw">for </span><span class="macro-nonterminal">$ty </span>{ |
| <span class="doccomment">/// Generate a floating point number in the half-open |
| /// interval `[0,1)`. |
| /// |
| /// See `Closed01` for the closed interval `[0,1]`, |
| /// and `Open01` for the open interval `(0,1)`. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> <span class="macro-nonterminal">$ty </span>{ |
| rng.<span class="macro-nonterminal">$method_name</span>() |
| } |
| } |
| <span class="kw">impl </span>Rand <span class="kw">for </span>Open01<<span class="macro-nonterminal">$ty</span>> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> Open01<<span class="macro-nonterminal">$ty</span>> { |
| <span class="comment">// add a small amount (specifically 2 bits below |
| // the precision of f64/f32 at 1.0), so that small |
| // numbers are larger than 0, but large numbers |
| // aren't pushed to/above 1. |
| </span>Open01(rng.<span class="macro-nonterminal">$method_name</span>() + <span class="number">0.25 </span>/ SCALE) |
| } |
| } |
| <span class="kw">impl </span>Rand <span class="kw">for </span>Closed01<<span class="macro-nonterminal">$ty</span>> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> Closed01<<span class="macro-nonterminal">$ty</span>> { |
| <span class="comment">// rescale so that 1.0 - epsilon becomes 1.0 |
| // precisely. |
| </span>Closed01(rng.<span class="macro-nonterminal">$method_name</span>() * SCALE / (SCALE - <span class="number">1.0</span>)) |
| } |
| } |
| } |
| }; |
| } |
| <span class="macro">float_impls! </span>{ f64_rand_impls, f64, <span class="number">53</span>, next_f64 } |
| <span class="macro">float_impls! </span>{ f32_rand_impls, f32, <span class="number">24</span>, next_f32 } |
| |
| <span class="kw">impl </span>Rand <span class="kw">for </span>char { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> char { |
| <span class="comment">// a char is 21 bits |
| </span><span class="kw">const </span>CHAR_MASK: u32 = <span class="number">0x001f_ffff</span>; |
| <span class="kw">loop </span>{ |
| <span class="comment">// Rejection sampling. About 0.2% of numbers with at most |
| // 21-bits are invalid codepoints (surrogates), so this |
| // will succeed first go almost every time. |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(c) = char::from_u32(rng.next_u32() & CHAR_MASK) { |
| <span class="kw">return </span>c; |
| } |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Rand <span class="kw">for </span>bool { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> bool { |
| rng.gen::<u8>() & <span class="number">1 </span>== <span class="number">1 |
| </span>} |
| } |
| |
| <span class="macro">macro_rules! </span>tuple_impl { |
| <span class="comment">// use variables to indicate the arity of the tuple |
| </span>($(<span class="macro-nonterminal">$tyvar</span>:ident),* ) => { |
| <span class="comment">// the trailing commas are for the 1 tuple |
| </span><span class="kw">impl</span>< |
| $( <span class="macro-nonterminal">$tyvar </span>: Rand ),* |
| > Rand <span class="kw">for </span>( $( <span class="macro-nonterminal">$tyvar </span>),* , ) { |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(_rng: <span class="kw-2">&mut </span>R) -> ( $( <span class="macro-nonterminal">$tyvar </span>),* , ) { |
| ( |
| <span class="comment">// use the $tyvar's to get the appropriate number of |
| // repeats (they're not actually needed) |
| </span>$( |
| _rng.gen::<<span class="macro-nonterminal">$tyvar</span>>() |
| ),* |
| , |
| ) |
| } |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Rand <span class="kw">for </span>() { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(<span class="kw">_</span>: <span class="kw-2">&mut </span>R) {} |
| } |
| <span class="macro">tuple_impl! </span>{A} |
| <span class="macro">tuple_impl! </span>{A, B} |
| <span class="macro">tuple_impl! </span>{A, B, C} |
| <span class="macro">tuple_impl! </span>{A, B, C, D} |
| <span class="macro">tuple_impl! </span>{A, B, C, D, E} |
| <span class="macro">tuple_impl! </span>{A, B, C, D, E, F} |
| <span class="macro">tuple_impl! </span>{A, B, C, D, E, F, G} |
| <span class="macro">tuple_impl! </span>{A, B, C, D, E, F, G, H} |
| <span class="macro">tuple_impl! </span>{A, B, C, D, E, F, G, H, I} |
| <span class="macro">tuple_impl! </span>{A, B, C, D, E, F, G, H, I, J} |
| <span class="macro">tuple_impl! </span>{A, B, C, D, E, F, G, H, I, J, K} |
| <span class="macro">tuple_impl! </span>{A, B, C, D, E, F, G, H, I, J, K, L} |
| |
| <span class="macro">macro_rules! </span>array_impl { |
| {<span class="macro-nonterminal">$n</span>:expr, <span class="macro-nonterminal">$t</span>:ident, $(<span class="macro-nonterminal">$ts</span>:ident,)<span class="kw-2">*</span>} => { |
| <span class="macro">array_impl!</span>{(<span class="macro-nonterminal">$n </span>- <span class="number">1</span>), $(<span class="macro-nonterminal">$ts</span>,)<span class="kw-2">*</span>} |
| |
| <span class="kw">impl</span><T> Rand <span class="kw">for </span>[T; <span class="macro-nonterminal">$n</span>] <span class="kw">where </span>T: Rand { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(_rng: <span class="kw-2">&mut </span>R) -> [T; <span class="macro-nonterminal">$n</span>] { |
| [_rng.gen::<<span class="macro-nonterminal">$t</span>>(), $(_rng.gen::<<span class="macro-nonterminal">$ts</span>>()),<span class="kw-2">*</span>] |
| } |
| } |
| }; |
| {<span class="macro-nonterminal">$n</span>:expr,} => { |
| <span class="kw">impl</span><T> Rand <span class="kw">for </span>[T; <span class="macro-nonterminal">$n</span>] { |
| <span class="kw">fn </span>rand<R: Rng>(_rng: <span class="kw-2">&mut </span>R) -> [T; <span class="macro-nonterminal">$n</span>] { [] } |
| } |
| }; |
| } |
| |
| <span class="macro">array_impl! </span>{<span class="number">32</span>, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T, T,} |
| |
| <span class="kw">impl</span><T: Rand> Rand <span class="kw">for </span><span class="prelude-ty">Option</span><T> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>rand<R: Rng>(rng: <span class="kw-2">&mut </span>R) -> <span class="prelude-ty">Option</span><T> { |
| <span class="kw">if </span>rng.gen() { |
| <span class="prelude-val">Some</span>(rng.gen()) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="sgx_rand" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
