Macro serde::serde_if_integer128 [−][src]
macro_rules! serde_if_integer128 {
($($tt : tt) *) => { ... };
}
Expand description
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.
ⓘ
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> {
/* ... */
}
/* ... */
serde_if_integer128! {
fn serialize_i128(self, v: i128) -> Result<Self::Ok, Self::Error> {
/* ... */
}
fn serialize_u128(self, v: u128) -> Result<Self::Ok, Self::Error> {
/* ... */
}
}
}
When Serde is built with support for 128-bit integers, this macro expands transparently into just the input tokens.
ⓘ
macro_rules! serde_if_integer128 {
($($tt:tt)*) => {
$($tt)*
};
}
When built without support for 128-bit integers, this macro expands to nothing.
ⓘ
macro_rules! serde_if_integer128 {
($($tt:tt)*) => {};
}