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1 | /// Conditional compilation depending on whether Serde is built with support for | |
2 | /// 128-bit integers. | |
3 | /// | |
4 | /// Data formats that wish to support Rust compiler versions older than 1.26 may | |
5 | /// place the i128 / u128 methods of their Serializer and Deserializer behind | |
6 | /// this macro. | |
7 | /// | |
8 | /// Data formats that require a minimum Rust compiler version of at least 1.26 | |
9 | /// do not need to bother with this macro and may assume support for 128-bit | |
10 | /// integers. | |
11 | /// | |
12 | /// ```rust | |
13 | /// #[macro_use] | |
14 | /// extern crate serde; | |
15 | /// | |
16 | /// use serde::Serializer; | |
17 | /// # use serde::private::ser::Error; | |
18 | /// # | |
19 | /// # struct MySerializer; | |
20 | /// | |
21 | /// impl Serializer for MySerializer { | |
22 | /// type Ok = (); | |
23 | /// type Error = Error; | |
24 | /// | |
25 | /// fn serialize_i64(self, v: i64) -> Result<Self::Ok, Self::Error> { | |
26 | /// /* ... */ | |
27 | /// # unimplemented!() | |
28 | /// } | |
29 | /// | |
30 | /// /* ... */ | |
31 | /// | |
32 | /// serde_if_integer128! { | |
33 | /// fn serialize_i128(self, v: i128) -> Result<Self::Ok, Self::Error> { | |
34 | /// /* ... */ | |
35 | /// # unimplemented!() | |
36 | /// } | |
37 | /// | |
38 | /// fn serialize_u128(self, v: u128) -> Result<Self::Ok, Self::Error> { | |
39 | /// /* ... */ | |
40 | /// # unimplemented!() | |
41 | /// } | |
42 | /// } | |
43 | /// # | |
44 | /// # __serialize_unimplemented! { | |
45 | /// # bool i8 i16 i32 u8 u16 u32 u64 f32 f64 char str bytes none some | |
46 | /// # unit unit_struct unit_variant newtype_struct newtype_variant seq | |
47 | /// # tuple tuple_struct tuple_variant map struct struct_variant | |
48 | /// # } | |
49 | /// } | |
50 | /// # | |
51 | /// # fn main() {} | |
52 | /// ``` | |
53 | /// | |
54 | /// When Serde is built with support for 128-bit integers, this macro expands | |
55 | /// transparently into just the input tokens. | |
56 | /// | |
57 | /// ```rust | |
58 | /// macro_rules! serde_if_integer128 { | |
59 | /// ($($tt:tt)*) => { | |
60 | /// $($tt)* | |
61 | /// }; | |
62 | /// } | |
63 | /// ``` | |
64 | /// | |
65 | /// When built without support for 128-bit integers, this macro expands to | |
66 | /// nothing. | |
67 | /// | |
68 | /// ```rust | |
69 | /// macro_rules! serde_if_integer128 { | |
70 | /// ($($tt:tt)*) => {}; | |
71 | /// } | |
72 | /// ``` | |
73 | #[cfg(integer128)] | |
74 | #[macro_export] | |
75 | macro_rules! serde_if_integer128 { | |
76 | ($($tt:tt)*) => { | |
77 | $($tt)* | |
78 | }; | |
79 | } | |
80 | ||
81 | #[cfg(not(integer128))] | |
82 | #[macro_export] | |
83 | #[doc(hidden)] | |
84 | macro_rules! serde_if_integer128 { | |
85 | ($($tt:tt)*) => {}; | |
86 | } |