diff options
| author | garhve <git@garhve.com> | 2022-12-20 11:04:25 +0800 |
|---|---|---|
| committer | garhve <git@garhve.com> | 2022-12-20 11:04:25 +0800 |
| commit | 369d11587339ce74f8ebc76f2607fe55545eaf7d (patch) | |
| tree | 4b25c6f7e3aca08a90b25950f4f8e4430c4294bc /rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/cfg_if | |
| parent | 0f1b6d015243e55a38b1c1b7e8af66668e4e794d (diff) | |
Build small project following the book
Diffstat (limited to 'rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/cfg_if')
| -rw-r--r-- | rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/cfg_if/lib.rs.html | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/cfg_if/lib.rs.html b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/cfg_if/lib.rs.html new file mode 100644 index 0000000..8c9fb7c --- /dev/null +++ b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/cfg_if/lib.rs.html @@ -0,0 +1,354 @@ +<!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 `/home/pico/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/cfg-if-1.0.0/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.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" 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src="../../wheel.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> +<span id="2">2</span> +<span id="3">3</span> +<span id="4">4</span> +<span id="5">5</span> +<span id="6">6</span> +<span id="7">7</span> +<span id="8">8</span> +<span id="9">9</span> +<span id="10">10</span> +<span id="11">11</span> +<span id="12">12</span> +<span id="13">13</span> +<span id="14">14</span> +<span id="15">15</span> +<span id="16">16</span> +<span id="17">17</span> +<span id="18">18</span> +<span id="19">19</span> +<span id="20">20</span> +<span id="21">21</span> +<span id="22">22</span> +<span id="23">23</span> +<span id="24">24</span> +<span id="25">25</span> +<span id="26">26</span> +<span id="27">27</span> +<span id="28">28</span> +<span id="29">29</span> +<span id="30">30</span> +<span id="31">31</span> +<span id="32">32</span> +<span id="33">33</span> +<span id="34">34</span> +<span id="35">35</span> 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A macro for defining `#[cfg]` if-else statements. +//! +//! The macro provided by this crate, `cfg_if`, is similar to the `if/elif` C +//! preprocessor macro by allowing definition of a cascade of `#[cfg]` cases, +//! emitting the implementation which matches first. +//! +//! This allows you to conveniently provide a long list `#[cfg]`'d blocks of code +//! without having to rewrite each clause multiple times. +//! +//! # Example +//! +//! ``` +//! cfg_if::cfg_if! { +//! if #[cfg(unix)] { +//! fn foo() { /* unix specific functionality */ } +//! } else if #[cfg(target_pointer_width = "32")] { +//! fn foo() { /* non-unix, 32-bit functionality */ } +//! } else { +//! fn foo() { /* fallback implementation */ } +//! } +//! } +//! +//! # fn main() {} +//! ``` + +</span><span class="attribute">#![no_std] +#![doc(html_root_url = <span class="string">"https://docs.rs/cfg-if"</span>)] +#![deny(missing_docs)] +#![cfg_attr(test, deny(warnings))] + +</span><span class="doccomment">/// The main macro provided by this crate. See crate documentation for more +/// information. +</span><span class="attribute">#[macro_export] +</span><span class="macro">macro_rules! </span>cfg_if { + <span class="comment">// match if/else chains with a final `else` + </span>($( + <span class="kw">if </span><span class="attribute">#[cfg(<span class="macro-nonterminal">$meta</span>:meta)] </span>{ $(<span class="macro-nonterminal">$tokens</span>:tt)* } + ) <span class="kw">else </span>* <span class="kw">else </span>{ + $(<span class="macro-nonterminal">$tokens2</span>:tt)* + }) => { + <span class="macro-nonterminal">$</span><span class="macro">crate::cfg_if! </span>{ + @<span class="macro-nonterminal">__items + </span>() ; + $( ( (<span class="macro-nonterminal">$meta</span>) ($(<span class="macro-nonterminal">$tokens</span>)<span class="kw-2">*</span>) ), )* + ( () ($(<span class="macro-nonterminal">$tokens2</span>)<span class="kw-2">*</span>) ), + } + }; + + <span class="comment">// match if/else chains lacking a final `else` + </span>( + <span class="kw">if </span><span class="attribute">#[cfg(<span class="macro-nonterminal">$i_met</span>:meta)] </span>{ $(<span class="macro-nonterminal">$i_tokens</span>:tt)* } + $( + <span class="kw">else if </span><span class="attribute">#[cfg(<span class="macro-nonterminal">$e_met</span>:meta)] </span>{ $(<span class="macro-nonterminal">$e_tokens</span>:tt)* } + )* + ) => { + <span class="macro-nonterminal">$</span><span class="macro">crate::cfg_if! </span>{ + @<span class="macro-nonterminal">__items + </span>() ; + ( (<span class="macro-nonterminal">$i_met</span>) ($(<span class="macro-nonterminal">$i_tokens</span>)<span class="kw-2">*</span>) ), + $( ( (<span class="macro-nonterminal">$e_met</span>) ($(<span class="macro-nonterminal">$e_tokens</span>)<span class="kw-2">*</span>) ), )* + ( () () ), + } + }; + + <span class="comment">// Internal and recursive macro to emit all the items + // + // Collects all the negated cfgs in a list at the beginning and after the + // semicolon is all the remaining items + </span>(@__items ($(<span class="macro-nonterminal">$not</span>:meta,)<span class="kw-2">*</span>) ; ) => {}; + (@__items ($(<span class="macro-nonterminal">$not</span>:meta,)<span class="kw-2">*</span>) ; ( ($(<span class="macro-nonterminal">$m</span>:meta),<span class="kw-2">*</span>) ($(<span class="macro-nonterminal">$tokens</span>:tt)<span class="kw-2">*</span>) ), $(<span class="macro-nonterminal">$rest</span>:tt)<span class="kw-2">*</span>) => { + <span class="comment">// Emit all items within one block, applying an appropriate #[cfg]. The + // #[cfg] will require all `$m` matchers specified and must also negate + // all previous matchers. + </span><span class="attribute">#[cfg(all($(<span class="macro-nonterminal">$m</span>,)* not(any($(<span class="macro-nonterminal">$not</span>),<span class="kw-2">*</span>))))] </span><span class="macro-nonterminal">$</span><span class="macro">crate::cfg_if! </span>{ @<span class="macro-nonterminal">__identity </span>$(<span class="macro-nonterminal">$tokens</span>)* } + + <span class="comment">// Recurse to emit all other items in `$rest`, and when we do so add all + // our `$m` matchers to the list of `$not` matchers as future emissions + // will have to negate everything we just matched as well. + </span><span class="macro-nonterminal">$</span><span class="macro">crate::cfg_if! </span>{ @<span class="macro-nonterminal">__items </span>($(<span class="macro-nonterminal">$not</span>,)* $(<span class="macro-nonterminal">$m</span>,)<span class="kw-2">*</span>) ; $(<span class="macro-nonterminal">$rest</span>)* } + }; + + <span class="comment">// Internal macro to make __apply work out right for different match types, + // because of how macros matching/expand stuff. + </span>(@__identity $(<span class="macro-nonterminal">$tokens</span>:tt)<span class="kw-2">*</span>) => { + $(<span class="macro-nonterminal">$tokens</span>)* + }; +} + +<span class="attribute">#[cfg(test)] +</span><span class="kw">mod </span>tests { + <span class="macro">cfg_if! </span>{ + <span class="kw">if </span><span class="attribute">#[cfg(test)] </span>{ + <span class="kw">use </span>core::option::Option <span class="kw">as </span>Option2; + <span class="kw">fn </span>works1() -> Option2<u32> { <span class="prelude-val">Some</span>(<span class="number">1</span>) } + } <span class="kw">else </span>{ + <span class="kw">fn </span>works1() -> <span class="prelude-ty">Option</span><u32> { <span class="prelude-val">None </span>} + } + } + + <span class="macro">cfg_if! </span>{ + <span class="kw">if </span><span class="attribute">#[cfg(foo)] </span>{ + <span class="kw">fn </span>works2() -> bool { <span class="bool-val">false </span>} + } <span class="kw">else if </span><span class="attribute">#[cfg(test)] </span>{ + <span class="kw">fn </span>works2() -> bool { <span class="bool-val">true </span>} + } <span class="kw">else </span>{ + <span class="kw">fn </span>works2() -> bool { <span class="bool-val">false </span>} + } + } + + <span class="macro">cfg_if! </span>{ + <span class="kw">if </span><span class="attribute">#[cfg(foo)] </span>{ + <span class="kw">fn </span>works3() -> bool { <span class="bool-val">false </span>} + } <span class="kw">else </span>{ + <span class="kw">fn </span>works3() -> bool { <span class="bool-val">true </span>} + } + } + + <span class="macro">cfg_if! </span>{ + <span class="kw">if </span><span class="attribute">#[cfg(test)] </span>{ + <span class="kw">use </span>core::option::Option <span class="kw">as </span>Option3; + <span class="kw">fn </span>works4() -> Option3<u32> { <span class="prelude-val">Some</span>(<span class="number">1</span>) } + } + } + + <span class="macro">cfg_if! </span>{ + <span class="kw">if </span><span class="attribute">#[cfg(foo)] </span>{ + <span class="kw">fn </span>works5() -> bool { <span class="bool-val">false </span>} + } <span class="kw">else if </span><span class="attribute">#[cfg(test)] </span>{ + <span class="kw">fn </span>works5() -> bool { <span class="bool-val">true </span>} + } + } + + <span class="attribute">#[test] + </span><span class="kw">fn </span>it_works() { + <span class="macro">assert!</span>(works1().is_some()); + <span class="macro">assert!</span>(works2()); + <span class="macro">assert!</span>(works3()); + <span class="macro">assert!</span>(works4().is_some()); + <span class="macro">assert!</span>(works5()); + } + + <span class="attribute">#[test] + #[allow(clippy::assertions_on_constants)] + </span><span class="kw">fn </span>test_usage_within_a_function() { + <span class="macro">cfg_if! </span>{<span class="kw">if </span><span class="attribute">#[cfg(debug_assertions)] </span>{ + <span class="comment">// we want to put more than one thing here to make sure that they + // all get configured properly. + </span><span class="macro">assert!</span>(<span class="macro">cfg!</span>(debug_assertions)); + <span class="macro">assert_eq!</span>(<span class="number">4</span>, <span class="number">2</span>+<span class="number">2</span>); + } <span class="kw">else </span>{ + <span class="macro">assert!</span>(works1().is_some()); + <span class="macro">assert_eq!</span>(<span class="number">10</span>, <span class="number">5</span>+<span class="number">5</span>); + }} + } + + <span class="kw">trait </span>Trait { + <span class="kw">fn </span>blah(<span class="kw-2">&</span><span class="self">self</span>); + } + + <span class="attribute">#[allow(dead_code)] + </span><span class="kw">struct </span>Struct; + + <span class="kw">impl </span>Trait <span class="kw">for </span>Struct { + <span class="macro">cfg_if! </span>{ + <span class="kw">if </span><span class="attribute">#[cfg(feature = <span class="string">"blah"</span>)] </span>{ + <span class="kw">fn </span>blah(<span class="kw-2">&</span><span class="self">self</span>) { + <span class="macro">unimplemented!</span>(); + } + } <span class="kw">else </span>{ + <span class="kw">fn </span>blah(<span class="kw-2">&</span><span class="self">self</span>) { + <span class="macro">unimplemented!</span>(); + } + } + } + } +} +</code></pre></div> +</section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="cfg_if" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1)" ></div></body></html>
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