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<ol class="chapter"><li class="affix"><a href="introduction.html">Introduction</a></li><li><a href="notation.html"><strong aria-hidden="true">1.</strong> Notation</a></li><li><a href="lexical-structure.html"><strong aria-hidden="true">2.</strong> Lexical structure</a></li><li><ol class="section"><li><a href="input-format.html"><strong aria-hidden="true">2.1.</strong> Input format</a></li><li><a href="keywords.html"><strong aria-hidden="true">2.2.</strong> Keywords</a></li><li><a href="identifiers.html"><strong aria-hidden="true">2.3.</strong> Identifiers</a></li><li><a href="comments.html"><strong aria-hidden="true">2.4.</strong> Comments</a></li><li><a href="whitespace.html"><strong aria-hidden="true">2.5.</strong> Whitespace</a></li><li><a href="tokens.html"><strong aria-hidden="true">2.6.</strong> Tokens</a></li><li><a href="paths.html"><strong aria-hidden="true">2.7.</strong> Paths</a></li></ol></li><li><a href="macros.html"><strong aria-hidden="true">3.</strong> Macros</a></li><li><ol class="section"><li><a href="macros-by-example.html"><strong aria-hidden="true">3.1.</strong> Macros By Example</a></li><li><a href="procedural-macros.html"><strong aria-hidden="true">3.2.</strong> Procedural Macros</a></li></ol></li><li><a href="crates-and-source-files.html"><strong aria-hidden="true">4.</strong> Crates and source files</a></li><li><a href="conditional-compilation.html"><strong aria-hidden="true">5.</strong> Conditional compilation</a></li><li><a href="items.html"><strong aria-hidden="true">6.</strong> Items</a></li><li><ol class="section"><li><a href="items/modules.html"><strong aria-hidden="true">6.1.</strong> Modules</a></li><li><a href="items/extern-crates.html"><strong aria-hidden="true">6.2.</strong> Extern crates</a></li><li><a href="items/use-declarations.html"><strong aria-hidden="true">6.3.</strong> Use declarations</a></li><li><a href="items/functions.html"><strong aria-hidden="true">6.4.</strong> Functions</a></li><li><a href="items/type-aliases.html"><strong aria-hidden="true">6.5.</strong> Type aliases</a></li><li><a href="items/structs.html"><strong aria-hidden="true">6.6.</strong> Structs</a></li><li><a href="items/enumerations.html"><strong aria-hidden="true">6.7.</strong> Enumerations</a></li><li><a href="items/unions.html"><strong aria-hidden="true">6.8.</strong> Unions</a></li><li><a href="items/constant-items.html"><strong aria-hidden="true">6.9.</strong> Constant items</a></li><li><a href="items/static-items.html"><strong aria-hidden="true">6.10.</strong> Static items</a></li><li><a href="items/traits.html"><strong aria-hidden="true">6.11.</strong> Traits</a></li><li><a href="items/implementations.html"><strong aria-hidden="true">6.12.</strong> Implementations</a></li><li><a href="items/external-blocks.html"><strong aria-hidden="true">6.13.</strong> External blocks</a></li><li><a href="items/generics.html"><strong aria-hidden="true">6.14.</strong> Type and lifetime parameters</a></li><li><a href="items/associated-items.html"><strong aria-hidden="true">6.15.</strong> Associated Items</a></li><li><a href="visibility-and-privacy.html"><strong aria-hidden="true">6.16.</strong> Visibility and Privacy</a></li></ol></li><li><a href="attributes.html"><strong aria-hidden="true">7.</strong> Attributes</a></li><li><ol class="section"><li><a href="attributes/testing.html"><strong aria-hidden="true">7.1.</strong> Testing</a></li><li><a href="attributes/derive.html"><strong aria-hidden="true">7.2.</strong> Derive</a></li><li><a href="attributes/diagnostics.html"><strong aria-hidden="true">7.3.</strong> Diagnostics</a></li><li><a href="attributes/codegen.html"><strong aria-hidden="true">7.4.</strong> Code generation</a></li><li><a href="attributes/limits.html"><strong aria-hidden="true">7.5.</strong> Limits</a></li></ol></li><li><a href="statements-and-expressions.html"><strong aria-hidden="true">8.</strong> Statements and expressions</a></li><li><ol class="section"><li><a href="statements.html"><strong aria-hidden="true">8.1.</strong> Statements</a></li><li><a href="expressions.html"><strong aria-hidden="true">8.2.</strong> Expressions</a></li><li><ol class="section"><li><a href="expressions/literal-expr.html"><strong aria-hidden="true">8.2.1.</strong> Literal expressions</a></li><li><a href="expressions/path-expr.html"><strong aria-hidden="true">8.2.2.</strong> Path expressions</a></li><li><a href="expressions/block-expr.html"><strong aria-hidden="true">8.2.3.</strong> Block expressions</a></li><li><a href="expressions/operator-expr.html"><strong aria-hidden="true">8.2.4.</strong> Operator expressions</a></li><li><a href="expressions/grouped-expr.html"><strong aria-hidden="true">8.2.5.</strong> Grouped expressions</a></li><li><a href="expressions/array-expr.html"><strong aria-hidden="true">8.2.6.</strong> Array and index expressions</a></li><li><a href="expressions/tuple-expr.html"><strong aria-hidden="true">8.2.7.</strong> Tuple and index expressions</a></li><li><a href="expressions/struct-expr.html"><strong aria-hidden="true">8.2.8.</strong> Struct expressions</a></li><li><a href="expressions/enum-variant-expr.html"><strong aria-hidden="true">8.2.9.</strong> Enum variant expressions</a></li><li><a href="expressions/call-expr.html"><strong aria-hidden="true">8.2.10.</strong> Call expressions</a></li><li><a href="expressions/method-call-expr.html"><strong aria-hidden="true">8.2.11.</strong> Method call expressions</a></li><li><a href="expressions/field-expr.html"><strong aria-hidden="true">8.2.12.</strong> Field access expressions</a></li><li><a href="expressions/closure-expr.html"><strong aria-hidden="true">8.2.13.</strong> Closure expressions</a></li><li><a href="expressions/loop-expr.html"><strong aria-hidden="true">8.2.14.</strong> Loop expressions</a></li><li><a href="expressions/range-expr.html"><strong aria-hidden="true">8.2.15.</strong> Range expressions</a></li><li><a href="expressions/if-expr.html"><strong aria-hidden="true">8.2.16.</strong> If and if let expressions</a></li><li><a href="expressions/match-expr.html" class="active"><strong aria-hidden="true">8.2.17.</strong> Match expressions</a></li><li><a href="expressions/return-expr.html"><strong aria-hidden="true">8.2.18.</strong> Return expressions</a></li></ol></li></ol></li><li><a href="patterns.html"><strong aria-hidden="true">9.</strong> Patterns</a></li><li><a href="type-system.html"><strong aria-hidden="true">10.</strong> Type system</a></li><li><ol class="section"><li><a href="types.html"><strong aria-hidden="true">10.1.</strong> Types</a></li><li><ol class="section"><li><a href="types/boolean.html"><strong aria-hidden="true">10.1.1.</strong> Boolean type</a></li><li><a href="types/numeric.html"><strong aria-hidden="true">10.1.2.</strong> Numeric types</a></li><li><a href="types/textual.html"><strong aria-hidden="true">10.1.3.</strong> Textual types</a></li><li><a href="types/never.html"><strong aria-hidden="true">10.1.4.</strong> Never type</a></li><li><a href="types/tuple.html"><strong aria-hidden="true">10.1.5.</strong> Tuple types</a></li><li><a href="types/array.html"><strong aria-hidden="true">10.1.6.</strong> Array types</a></li><li><a href="types/slice.html"><strong aria-hidden="true">10.1.7.</strong> Slice types</a></li><li><a href="types/struct.html"><strong aria-hidden="true">10.1.8.</strong> Struct types</a></li><li><a href="types/enum.html"><strong aria-hidden="true">10.1.9.</strong> Enumerated types</a></li><li><a href="types/union.html"><strong aria-hidden="true">10.1.10.</strong> Union types</a></li><li><a href="types/function-item.html"><strong aria-hidden="true">10.1.11.</strong> Function item types</a></li><li><a href="types/closure.html"><strong aria-hidden="true">10.1.12.</strong> Closure types</a></li><li><a href="types/pointer.html"><strong aria-hidden="true">10.1.13.</strong> Pointer types</a></li><li><a href="types/function-pointer.html"><strong aria-hidden="true">10.1.14.</strong> Function pointer types</a></li><li><a href="types/trait-object.html"><strong aria-hidden="true">10.1.15.</strong> Trait object types</a></li><li><a href="types/impl-trait.html"><strong aria-hidden="true">10.1.16.</strong> Impl trait type</a></li><li><a href="types/parameters.html"><strong aria-hidden="true">10.1.17.</strong> Type parameters</a></li><li><a href="types/inferred.html"><strong aria-hidden="true">10.1.18.</strong> Inferred type</a></li></ol></li><li><a href="dynamically-sized-types.html"><strong aria-hidden="true">10.2.</strong> Dynamically Sized Types</a></li><li><a href="type-layout.html"><strong aria-hidden="true">10.3.</strong> Type layout</a></li><li><a href="interior-mutability.html"><strong aria-hidden="true">10.4.</strong> Interior mutability</a></li><li><a href="subtyping.html"><strong aria-hidden="true">10.5.</strong> Subtyping and Variance</a></li><li><a href="trait-bounds.html"><strong aria-hidden="true">10.6.</strong> Trait and lifetime bounds</a></li><li><a href="type-coercions.html"><strong aria-hidden="true">10.7.</strong> Type coercions</a></li><li><a href="destructors.html"><strong aria-hidden="true">10.8.</strong> Destructors</a></li><li><a href="lifetime-elision.html"><strong aria-hidden="true">10.9.</strong> Lifetime elision</a></li></ol></li><li><a href="special-types-and-traits.html"><strong aria-hidden="true">11.</strong> Special types and traits</a></li><li><a href="memory-model.html"><strong aria-hidden="true">12.</strong> Memory model</a></li><li><ol class="section"><li><a href="memory-allocation-and-lifetime.html"><strong aria-hidden="true">12.1.</strong> Memory allocation and lifetime</a></li><li><a href="memory-ownership.html"><strong aria-hidden="true">12.2.</strong> Memory ownership</a></li><li><a href="variables.html"><strong aria-hidden="true">12.3.</strong> Variables</a></li></ol></li><li><a href="linkage.html"><strong aria-hidden="true">13.</strong> Linkage</a></li><li><a href="unsafety.html"><strong aria-hidden="true">14.</strong> Unsafety</a></li><li><ol class="section"><li><a href="unsafe-functions.html"><strong aria-hidden="true">14.1.</strong> Unsafe functions</a></li><li><a href="unsafe-blocks.html"><strong aria-hidden="true">14.2.</strong> Unsafe blocks</a></li><li><a href="behavior-considered-undefined.html"><strong aria-hidden="true">14.3.</strong> Behavior considered undefined</a></li><li><a href="behavior-not-considered-unsafe.html"><strong aria-hidden="true">14.4.</strong> Behavior not considered unsafe</a></li></ol></li><li><a href="const_eval.html"><strong aria-hidden="true">15.</strong> Constant Evaluation</a></li><li><a href="abi.html"><strong aria-hidden="true">16.</strong> Application Binary Interface</a></li><li><a href="runtime.html"><strong aria-hidden="true">17.</strong> The Rust runtime</a></li><li><a href="appendices.html"><strong aria-hidden="true">18.</strong> Appendices</a></li><li><ol class="section"><li><a href="macro-ambiguity.html"><strong aria-hidden="true">18.1.</strong> Macro Follow-Set Ambiguity Formal Specification</a></li><li><a href="influences.html"><strong aria-hidden="true">18.2.</strong> Influences</a></li><li><a href="glossary.html"><strong aria-hidden="true">18.3.</strong> Glossary</a></li></ol></li></ol>
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<a class="header" href="expressions/match-expr.html#match-expressions" id="match-expressions"><h1><code>match</code> expressions</h1></a>
<blockquote>
<p><strong><sup>Syntax</sup></strong><br />
<em>MatchExpression</em> :<br />
<code>match</code> <a href="expressions.html"><em>Expression</em></a><sub><em>except struct expression</em></sub> <code>{</code><br />
<a href="attributes.html"><em>InnerAttribute</em></a><sup>*</sup><br />
<em>MatchArms</em><sup>?</sup><br />
<code>}</code></p>
<p><em>MatchArms</em> :<br />
( <em>MatchArm</em> <code>=></code>
( <a href="expressions/block-expr.html#block-expressions"><em>BlockExpression</em></a> <code>,</code><sup>?</sup>
| <a href="expressions.html"><em>Expression</em></a> <code>,</code> )
)<sup>*</sup><br />
<em>MatchArm</em> <code>=></code> ( <a href="expressions/block-expr.html#block-expressions"><em>BlockExpression</em></a> | <a href="expressions.html"><em>Expression</em></a> ) <code>,</code><sup>?</sup></p>
<p><em>MatchArm</em> :<br />
<a href="attributes.html"><em>OuterAttribute</em></a><sup>*</sup> <em>MatchArmPatterns</em> <em>MatchArmGuard</em><sup>?</sup></p>
<p><em>MatchArmPatterns</em> :<br />
<code>|</code><sup>?</sup> <a href="patterns.html"><em>Pattern</em></a> ( <code>|</code> <a href="patterns.html"><em>Pattern</em></a> )<sup>*</sup></p>
<p><em>MatchArmGuard</em> :<br />
<code>if</code> <a href="expressions.html"><em>Expression</em></a></p>
</blockquote>
<p>A <em><code>match</code> expression</em> branches on a pattern. The exact form of matching that
occurs depends on the <a href="patterns.html">pattern</a>. A <code>match</code>
expression has a <em><a href="glossary.html#scrutinee">scrutinee</a> expression</em>, which is the value to compare to the
patterns. The scrutinee expression and the patterns must have the same type.</p>
<p>A <code>match</code> behaves differently depending on whether or not the scrutinee
expression is a <a href="expressions.html#place-expressions-and-value-expressions">place expression or value expression</a>.
If the scrutinee expression is a <a href="expressions.html#place-expressions-and-value-expressions">value expression</a>, it is first evaluated into
a temporary location, and the resulting value is sequentially compared to the
patterns in the arms until a match is found. The first arm with a matching
pattern is chosen as the branch target of the <code>match</code>, any variables bound by
the pattern are assigned to local variables in the arm's block, and control
enters the block.</p>
<p>When the scrutinee expression is a <a href="expressions.html#place-expressions-and-value-expressions">place expression</a>, the match does not
allocate a temporary location; however, a by-value binding may copy or move
from the memory location.
When possible, it is preferable to match on place expressions, as the lifetime
of these matches inherits the lifetime of the place expression rather than being
restricted to the inside of the match.</p>
<p>An example of a <code>match</code> expression:</p>
<pre><pre class="playpen"><code class="language-rust">
# #![allow(unused_variables)]
#fn main() {
let x = 1;
match x {
1 => println!("one"),
2 => println!("two"),
3 => println!("three"),
4 => println!("four"),
5 => println!("five"),
_ => println!("something else"),
}
#}</code></pre></pre>
<p>Variables bound within the pattern are scoped to the match guard and the arm's
expression. The <a href="patterns.html#binding-modes">binding mode</a> (move, copy, or reference) depends on the pattern.</p>
<p>Multiple match patterns may be joined with the <code>|</code> operator. Each pattern will be
tested in left-to-right sequence until a successful match is found.</p>
<pre><pre class="playpen"><code class="language-rust">
# #![allow(unused_variables)]
#fn main() {
# let x = 9;
let message = match x {
0 | 1 => "not many",
2 ..= 9 => "a few",
_ => "lots"
};
assert_eq!(message, "a few");
// Demonstration of pattern match order.
struct S(i32, i32);
match S(1, 2) {
S(z @ 1, _) | S(_, z @ 2) => assert_eq!(z, 1),
_ => panic!(),
}
#}</code></pre></pre>
<blockquote>
<p>Note: The <code>2..=9</code> is a <a href="patterns.html#range-patterns">Range Pattern</a>, not a <a href="expressions/range-expr.html">Range Expression</a>. Thus, only
those types of ranges supported by range patterns can be used in match arms.</p>
</blockquote>
<p>Every binding in each <code>|</code> separated pattern must appear in all of the patterns
in the arm. Every binding of the same name must have the same type, and have
the same binding mode.</p>
<p>Match arms can accept <em>match guards</em> to further refine the
criteria for matching a case. Pattern guards appear after the pattern and
consist of a bool-typed expression following the <code>if</code> keyword. A pattern guard
may refer to the variables bound within the pattern they follow.</p>
<p>When the pattern matches successfully, the pattern guard expression is executed.
If the expression evaluates to true, the pattern is successfully matched against.
Otherwise, the next pattern, including other matches with the <code>|</code> operator in
the same arm, is tested.</p>
<pre><pre class="playpen"><code class="language-rust">
# #![allow(unused_variables)]
#fn main() {
# let maybe_digit = Some(0);
# fn process_digit(i: i32) { }
# fn process_other(i: i32) { }
let message = match maybe_digit {
Some(x) if x < 10 => process_digit(x),
Some(x) => process_other(x),
None => panic!(),
};
#}</code></pre></pre>
<blockquote>
<p>Note: Multiple matches using the <code>|</code> operator can cause the pattern guard and
the side effects it has to execute multiple times. For example:</p>
<pre><pre class="playpen"><code class="language-rust">
# #![allow(unused_variables)]
#fn main() {
# use std::cell::Cell;
let i : Cell<i32> = Cell::new(0);
match 1 {
1 | _ if { i.set(i.get() + 1); false } => {}
_ => {}
}
assert_eq!(i.get(), 2);
#}</code></pre></pre>
</blockquote>
<a class="header" href="expressions/match-expr.html#attributes-on-match-arms" id="attributes-on-match-arms"><h2>Attributes on match arms</h2></a>
<p>Outer attributes are allowed on match arms. The only attributes that have
meaning on match arms are <a href="conditional-compilation.html"><code>cfg</code></a>, <a href="attributes/codegen.html#the-cold-attribute"><code>cold</code></a>, and the <a href="attributes/diagnostics.html#lint-check-attributes">lint check attributes</a>.</p>
<p><a href="attributes.html">Inner attributes</a> are allowed directly after the opening brace of the match
expression in the same expression contexts as <a href="expressions/block-expr.html#attributes-on-block-expressions">attributes on block
expressions</a>.</p>
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distrib
>
Mageia
>
7
>
armv7hl
>
media
>
core-release
>
by-pkgid
>
0c2243f8a1696816431e7210e991fa52
>
files
>
13357
