forked from rust-lang/rust
-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Test integer exponentiation in a const context
- Loading branch information
1 parent
269bf89
commit 7fe5eaf
Showing
1 changed file
with
37 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -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); | ||
} |