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Test integer exponentiation in a const context

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This commit is contained in:
Dylan MacKenzie 2020-02-08 16:50:00 -08:00
parent 269bf89865
commit 7fe5eaf7d8
1 changed files with 37 additions and 0 deletions
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37
src/test/ui/consts/const-int-pow-rpass.rs
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@ -1,11 +1,48 @@
// run-pass
#![feature(const_int_pow)]
#![feature(wrapping_next_power_of_two)]
const IS_POWER_OF_TWO_A: bool = 0u32.is_power_of_two();
const IS_POWER_OF_TWO_B: bool = 32u32.is_power_of_two();
const IS_POWER_OF_TWO_C: bool = 33u32.is_power_of_two();
const POW: u8 = 3u8.pow(5);
const CHECKED_POW_OK: Option<u8> = 3u8.checked_pow(5);
const CHECKED_POW_OVERFLOW: Option<u8> = 3u8.checked_pow(6);
const WRAPPING_POW: u8 = 3u8.wrapping_pow(6);
const OVERFLOWING_POW: (u8, bool) = 3u8.overflowing_pow(6);
const SATURATING_POW: u8 = 3u8.saturating_pow(6);
const NEXT_POWER_OF_TWO: u32 = 3u32.next_power_of_two();
const CHECKED_NEXT_POWER_OF_TWO_OK: Option<u32> = 3u32.checked_next_power_of_two();
const CHECKED_NEXT_POWER_OF_TWO_OVERFLOW: Option<u32> =
u32::max_value().checked_next_power_of_two();
const WRAPPING_NEXT_POWER_OF_TWO: u32 =
u32::max_value().wrapping_next_power_of_two();
fn main() {
assert!(!IS_POWER_OF_TWO_A);
assert!(IS_POWER_OF_TWO_B);
assert!(!IS_POWER_OF_TWO_C);
assert_eq!(POW, 243);
assert_eq!(CHECKED_POW_OK, Some(243));
assert_eq!(CHECKED_POW_OVERFLOW, None);
assert_eq!(WRAPPING_POW, 217);
assert_eq!(OVERFLOWING_POW, (217, true));
assert_eq!(SATURATING_POW, u8::max_value());
assert_eq!(NEXT_POWER_OF_TWO, 4);
assert_eq!(CHECKED_NEXT_POWER_OF_TWO_OK, Some(4));
assert_eq!(CHECKED_NEXT_POWER_OF_TWO_OVERFLOW, None);
assert_eq!(WRAPPING_NEXT_POWER_OF_TWO, 0);
}