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Auto merge of #58246 - pmccarter:master, r=oli-obk

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Make `saturating_add` and `saturating_sub` `const` functions

Fixes #58030
This commit is contained in:
bors 2019-02-12 03:20:16 +00:00
commit ba2853b6d3
5 changed files with 177 additions and 21 deletions
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34
src/test/run-pass/const-int-saturating-arith.rs Normal file
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@ -0,0 +1,34 @@
// ignore-emscripten no i128 support
#![feature(const_saturating_int_methods)]
const INT_U32_NO: u32 = (42 as u32).saturating_add(2);
const INT_U32: u32 = u32::max_value().saturating_add(1);
const INT_U128: u128 = u128::max_value().saturating_add(1);
const INT_I128: i128 = i128::max_value().saturating_add(1);
const INT_I128_NEG: i128 = i128::min_value().saturating_add(-1);
const INT_U32_NO_SUB: u32 = (42 as u32).saturating_sub(2);
const INT_U32_SUB: u32 = (1 as u32).saturating_sub(2);
const INT_I32_NO_SUB: i32 = (-42 as i32).saturating_sub(2);
const INT_I32_NEG_SUB: i32 = i32::min_value().saturating_sub(1);
const INT_I32_POS_SUB: i32 = i32::max_value().saturating_sub(-1);
const INT_U128_SUB: u128 = (0 as u128).saturating_sub(1);
const INT_I128_NEG_SUB: i128 = i128::min_value().saturating_sub(1);
const INT_I128_POS_SUB: i128 = i128::max_value().saturating_sub(-1);
fn main() {
assert_eq!(INT_U32_NO, 44);
assert_eq!(INT_U32, u32::max_value());
assert_eq!(INT_U128, u128::max_value());
assert_eq!(INT_I128, i128::max_value());
assert_eq!(INT_I128_NEG, i128::min_value());
assert_eq!(INT_U32_NO_SUB, 40);
assert_eq!(INT_U32_SUB, 0);
assert_eq!(INT_I32_NO_SUB, -44);
assert_eq!(INT_I32_NEG_SUB, i32::min_value());
assert_eq!(INT_I32_POS_SUB, i32::max_value());
assert_eq!(INT_U128_SUB, 0);
assert_eq!(INT_I128_NEG_SUB, i128::min_value());
assert_eq!(INT_I128_POS_SUB, i128::max_value());
}