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<br>
<p>The nightly-only <a href="https://doc.rust-lang.org/std/macro.concat_idents.html"><code>concat_idents!</code></a> macro in the Rust standard library is
notoriously underpowered in that its concatenated identifiers can only refer to
@@ -18,15 +18,15 @@ single identifier.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="comment">// Macro in item position: at module scope or inside of an impl block.</span>
<span class="ident">paste</span>::<span class="macro">item</span><span class="macro">!</span> {
<span class="macro">paste::item!</span> {
<span class="comment">// Defines a const called `QRST`.</span>
<span class="kw">const</span> [<span class="op">&lt;</span><span class="ident">Q</span> <span class="ident">R</span> <span class="ident">S</span> <span class="ident">T</span><span class="op">&gt;</span>]: <span class="kw-2">&amp;</span><span class="ident">str</span> <span class="op">=</span> <span class="string">&quot;success!&quot;</span>;
}
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="comment">// Macro in expression position: inside a function body.</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">paste</span>::<span class="macro">expr</span><span class="macro">!</span> { [<span class="op">&lt;</span><span class="ident">Q</span> <span class="ident">R</span> <span class="ident">S</span> <span class="ident">T</span><span class="op">&gt;</span>].<span class="ident">len</span>() },
<span class="macro">assert_eq!</span>(
<span class="macro">paste::expr!</span> { [<span class="op">&lt;</span><span class="ident">Q</span> <span class="ident">R</span> <span class="ident">S</span> <span class="ident">T</span><span class="op">&gt;</span>].<span class="ident">len</span>() },
<span class="number">8</span>,
);
}</pre></div>
@@ -40,23 +40,23 @@ macro expands to a vector containing <code>ROUTE_A</code> and <code>ROUTE_B</cod
<span class="kw">const</span> <span class="ident">ROUTE_A</span>: <span class="kw-2">&amp;</span><span class="ident">str</span> <span class="op">=</span> <span class="string">&quot;/a&quot;</span>;
<span class="kw">const</span> <span class="ident">ROUTE_B</span>: <span class="kw-2">&amp;</span><span class="ident">str</span> <span class="op">=</span> <span class="string">&quot;/b&quot;</span>;
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">routes</span> {
<span class="macro">macro_rules!</span> <span class="ident">routes</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">route</span>:<span class="ident">ident</span>),<span class="kw-2">*</span>) <span class="op">=</span><span class="op">&gt;</span> {{
<span class="ident">paste</span>::<span class="macro">expr</span><span class="macro">!</span> {
<span class="macro">vec</span><span class="macro">!</span>[$( [<span class="op">&lt;</span><span class="ident">ROUTE_</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">route</span><span class="op">&gt;</span>] ),<span class="kw-2">*</span>]
<span class="macro">paste::expr!</span> {
<span class="macro">vec!</span>[$( [<span class="op">&lt;</span><span class="ident">ROUTE_</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">route</span><span class="op">&gt;</span>] ),<span class="kw-2">*</span>]
}
}}
}
<span class="kw">fn</span> <span class="ident">main</span>() {
<span class="kw">let</span> <span class="ident">routes</span> <span class="op">=</span> <span class="macro">routes</span><span class="macro">!</span>(<span class="ident">A</span>, <span class="ident">B</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">routes</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&quot;/a&quot;</span>, <span class="string">&quot;/b&quot;</span>]);
<span class="kw">let</span> <span class="ident">routes</span> <span class="op">=</span> <span class="macro">routes!</span>(<span class="ident">A</span>, <span class="ident">B</span>);
<span class="macro">assert_eq!</span>(<span class="ident">routes</span>, <span class="macro">vec!</span>[<span class="string">&quot;/a&quot;</span>, <span class="string">&quot;/b&quot;</span>]);
}</pre></div>
<p>The next example shows a macro that generates accessor methods for some struct
fields.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">make_a_struct_and_getters</span> {
<span class="macro">macro_rules!</span> <span class="ident">make_a_struct_and_getters</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">ident</span>),<span class="op">*</span> }) <span class="op">=</span><span class="op">&gt;</span> {
<span class="comment">// Define a struct. This expands to:</span>
<span class="comment">//</span>
@@ -78,7 +78,7 @@ fields.</p>
<span class="comment">// pub fn get_b(&amp;self) -&gt; &amp;str { &amp;self.b }</span>
<span class="comment">// pub fn get_c(&amp;self) -&gt; &amp;str { &amp;self.c }</span>
<span class="comment">// }</span>
<span class="ident">paste</span>::<span class="macro">item</span><span class="macro">!</span> {
<span class="macro">paste::item!</span> {
<span class="kw">impl</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> {
$(
<span class="kw">pub</span> <span class="kw">fn</span> [<span class="op">&lt;</span><span class="ident">get_</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span><span class="op">&gt;</span>](<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">str</span> {
@@ -90,7 +90,7 @@ fields.</p>
}
}
<span class="macro">make_a_struct_and_getters</span><span class="macro">!</span>(<span class="ident">S</span> { <span class="ident">a</span>, <span class="ident">b</span>, <span class="ident">c</span> });
<span class="macro">make_a_struct_and_getters!</span>(<span class="ident">S</span> { <span class="ident">a</span>, <span class="ident">b</span>, <span class="ident">c</span> });
<span class="kw">fn</span> <span class="ident">call_some_getters</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">S</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
<span class="ident">s</span>.<span class="ident">get_a</span>() <span class="op">=</span><span class="op">=</span> <span class="ident">s</span>.<span class="ident">get_b</span>() <span class="op">&amp;&amp;</span> <span class="ident">s</span>.<span class="ident">get_c</span>().<span class="ident">is_empty</span>()
@@ -112,5 +112,5 @@ These compose, so for example <code>$var:snake:upper</code> would give you SCREA
items.</p>
</td></tr><tr class="module-item"><td><a class="macro" href="macro.item_with_macros.html" title="paste::item_with_macros macro">item_with_macros</a></td><td class="docblock-short"><p>Paste identifiers within a macro invocation that expands to one or more
macro_rules macros or items containing macros.</p>
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