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Implement Ser+De for Saturating<T>

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The serialization implementation is heavily
inspired by the existing trait implentation for
`std::num::Wrapping<T>`.

The deserializing implementation maps input values
that lie outside of the numerical range of the
output type to the `MIN` or `MAX` value of the
output type, depending on the sign of the input
value. This behaviour follows to the `Saturating`
semantics of the output type.

fix #2708
This commit is contained in:
Jörn Bethune
2024-03-04 18:56:15 +01:00
parent 5b24f88e73
commit 3d1b19ed90
6 changed files with 134 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
test_suite/tests/test_de.rs
+38 -1
View File
@@ -23,7 +23,7 @@ use std::iter;
use std::net;
use std::num::{
NonZeroI128, NonZeroI16, NonZeroI32, NonZeroI64, NonZeroI8, NonZeroIsize, NonZeroU128,
NonZeroU16, NonZeroU32, NonZeroU64, NonZeroU8, NonZeroUsize, Wrapping,
NonZeroU16, NonZeroU32, NonZeroU64, NonZeroU8, NonZeroUsize, Saturating, Wrapping,
};
use std::ops::Bound;
use std::path::{Path, PathBuf};
@@ -2065,6 +2065,43 @@ fn test_wrapping() {
test(Wrapping(1usize), &[Token::U64(1)]);
}
#[test]
fn test_saturating() {
test(Saturating(1usize), &[Token::U32(1)]);
test(Saturating(1usize), &[Token::U64(1)]);
test(Saturating(0u8), &[Token::I8(0)]);
test(Saturating(0u16), &[Token::I16(0)]);
// saturate input values at the minimum or maximum value
test(Saturating(u8::MAX), &[Token::U16(u16::MAX)]);
test(Saturating(u8::MAX), &[Token::U16(u8::MAX as u16 + 1)]);
test(Saturating(u16::MAX), &[Token::U32(u32::MAX)]);
test(Saturating(u32::MAX), &[Token::U64(u64::MAX)]);
test(Saturating(u8::MIN), &[Token::I8(i8::MIN)]);
test(Saturating(u16::MIN), &[Token::I16(i16::MIN)]);
test(Saturating(u32::MIN), &[Token::I32(i32::MIN)]);
test(Saturating(i8::MIN), &[Token::I16(i16::MIN)]);
test(Saturating(i16::MIN), &[Token::I32(i32::MIN)]);
test(Saturating(i32::MIN), &[Token::I64(i64::MIN)]);
test(Saturating(u8::MIN), &[Token::I8(-1)]);
test(Saturating(u16::MIN), &[Token::I16(-1)]);
#[cfg(target_pointer_width = "64")]
{
test(Saturating(usize::MIN), &[Token::U64(u64::MIN)]);
test(Saturating(usize::MAX), &[Token::U64(u64::MAX)]);
test(Saturating(isize::MIN), &[Token::I64(i64::MIN)]);
test(Saturating(isize::MAX), &[Token::I64(i64::MAX)]);
test(Saturating(0usize), &[Token::I64(i64::MIN)]);
test(
Saturating(9_223_372_036_854_775_807usize),
&[Token::I64(i64::MAX)],
);
}
}
#[test]
fn test_rc_dst() {
test(Rc::<str>::from("s"), &[Token::Str("s")]);
test_suite/tests/test_ser.rs
+6 -1
View File
@@ -8,7 +8,7 @@ use std::cell::RefCell;
use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
use std::ffi::CString;
use std::net;
use std::num::Wrapping;
use std::num::{Saturating, Wrapping};
use std::ops::Bound;
use std::path::{Path, PathBuf};
use std::rc::{Rc, Weak as RcWeak};
@@ -624,6 +624,11 @@ fn test_wrapping() {
assert_ser_tokens(&Wrapping(1usize), &[Token::U64(1)]);
}
#[test]
fn test_saturating() {
assert_ser_tokens(&Saturating(1usize), &[Token::U64(1)]);
}
#[test]
fn test_rc_dst() {
assert_ser_tokens(&Rc::<str>::from("s"), &[Token::Str("s")]);