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| </pre><pre class="rust"><code><span class="doccomment">/// Conditional compilation depending on whether Serde is built with support for</span> |
| <span class="doccomment">/// 128-bit integers.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Data formats that wish to support Rust compiler versions older than 1.26</span> |
| <span class="doccomment">/// (or targets that lack 128-bit integers) may place the i128 / u128 methods</span> |
| <span class="doccomment">/// of their Serializer and Deserializer behind this macro.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Data formats that require a minimum Rust compiler version of at least 1.26,</span> |
| <span class="doccomment">/// or do not target platforms that lack 128-bit integers, do not need to</span> |
| <span class="doccomment">/// bother with this macro and may assume support for 128-bit integers.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```edition2018</span> |
| <span class="doccomment">/// # use serde::__private::doc::Error;</span> |
| <span class="doccomment">/// #</span> |
| <span class="doccomment">/// # struct MySerializer;</span> |
| <span class="doccomment">/// #</span> |
| <span class="doccomment">/// use serde::{serde_if_integer128, Serializer};</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// impl Serializer for MySerializer {</span> |
| <span class="doccomment">/// type Ok = ();</span> |
| <span class="doccomment">/// type Error = Error;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// fn serialize_i64(self, v: i64) -> Result<Self::Ok, Self::Error> {</span> |
| <span class="doccomment">/// /* ... */</span> |
| <span class="doccomment">/// # unimplemented!()</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// /* ... */</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// serde_if_integer128! {</span> |
| <span class="doccomment">/// fn serialize_i128(self, v: i128) -> Result<Self::Ok, Self::Error> {</span> |
| <span class="doccomment">/// /* ... */</span> |
| <span class="doccomment">/// # unimplemented!()</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// fn serialize_u128(self, v: u128) -> Result<Self::Ok, Self::Error> {</span> |
| <span class="doccomment">/// /* ... */</span> |
| <span class="doccomment">/// # unimplemented!()</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// #</span> |
| <span class="doccomment">/// # serde::__serialize_unimplemented! {</span> |
| <span class="doccomment">/// # bool i8 i16 i32 u8 u16 u32 u64 f32 f64 char str bytes none some</span> |
| <span class="doccomment">/// # unit unit_struct unit_variant newtype_struct newtype_variant seq</span> |
| <span class="doccomment">/// # tuple tuple_struct tuple_variant map struct struct_variant</span> |
| <span class="doccomment">/// # }</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// When Serde is built with support for 128-bit integers, this macro expands</span> |
| <span class="doccomment">/// transparently into just the input tokens.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```edition2018</span> |
| <span class="doccomment">/// macro_rules! serde_if_integer128 {</span> |
| <span class="doccomment">/// ($($tt:tt)*) => {</span> |
| <span class="doccomment">/// $($tt)*</span> |
| <span class="doccomment">/// };</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// When built without support for 128-bit integers, this macro expands to</span> |
| <span class="doccomment">/// nothing.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// ```edition2018</span> |
| <span class="doccomment">/// macro_rules! serde_if_integer128 {</span> |
| <span class="doccomment">/// ($($tt:tt)*) => {};</span> |
| <span class="doccomment">/// }</span> |
| <span class="doccomment">/// ```</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">integer128</span>)]</span> |
| <span class="attribute">#[<span class="ident">macro_export</span>]</span> |
| <span class="macro">macro_rules!</span> <span class="ident">serde_if_integer128</span> { |
| ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) => { |
| $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>)<span class="op">*</span> |
| }; |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">integer128</span>))]</span> |
| <span class="attribute">#[<span class="ident">macro_export</span>]</span> |
| <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> |
| <span class="macro">macro_rules!</span> <span class="ident">serde_if_integer128</span> { |
| ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) => {}; |
| } |
| </code></pre></div> |
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