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