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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Macro <a href='index.html'>serde</a>::<wbr><a class="macro" href=''>serde_if_integer128</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../src/serde/integer128.rs.html#75-79' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class="rust macro">
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<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">serde_if_integer128</span> {
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($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=></span> { ... };
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}</pre>
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</div><div class='docblock'><p>Conditional compilation depending on whether Serde is built with support for
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128-bit integers.</p>
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<p>Data formats that wish to support Rust compiler versions older than 1.26 may
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place the i128 / u128 methods of their Serializer and Deserializer behind
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this macro.</p>
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<p>Data formats that require a minimum Rust compiler version of at least 1.26
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do not need to bother with this macro and may assume support for 128-bit
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integers.</p>
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<pre class="rust rust-example-rendered">
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<span class="attribute">#[<span class="ident">macro_use</span>]</span>
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">serde</span>;
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<span class="kw">use</span> <span class="ident">serde</span>::<span class="ident">Serializer</span>;
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<span class="kw">impl</span> <span class="ident">Serializer</span> <span class="kw">for</span> <span class="ident">MySerializer</span> {
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<span class="kw">type</span> <span class="prelude-val">Ok</span> <span class="op">=</span> ();
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<span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">Error</span>;
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<span class="kw">fn</span> <span class="ident">serialize_i64</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">i64</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>::<span class="prelude-val">Ok</span>, <span class="self">Self</span>::<span class="ident">Error</span><span class="op">></span> {
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<span class="comment">/* ... */</span>
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}
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<span class="comment">/* ... */</span>
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<span class="macro">serde_if_integer128</span><span class="macro">!</span> {
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<span class="kw">fn</span> <span class="ident">serialize_i128</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">i128</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>::<span class="prelude-val">Ok</span>, <span class="self">Self</span>::<span class="ident">Error</span><span class="op">></span> {
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<span class="comment">/* ... */</span>
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}
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<span class="kw">fn</span> <span class="ident">serialize_u128</span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">u128</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>::<span class="prelude-val">Ok</span>, <span class="self">Self</span>::<span class="ident">Error</span><span class="op">></span> {
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<span class="comment">/* ... */</span>
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}
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}
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}</pre>
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<p>When Serde is built with support for 128-bit integers, this macro expands
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transparently into just the input tokens.</p>
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<pre class="rust rust-example-rendered">
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<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">serde_if_integer128</span> {
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($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=></span> {
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$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>)<span class="op">*</span>
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};
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}</pre>
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<p>When built without support for 128-bit integers, this macro expands to
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nothing.</p>
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<pre class="rust rust-example-rendered">
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<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">serde_if_integer128</span> {
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($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=></span> {};
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}</pre>
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