3 #![feature(const_int_pow)]
4 #![feature(wrapping_next_power_of_two)]
6 const IS_POWER_OF_TWO_A: bool = 0u32.is_power_of_two();
7 const IS_POWER_OF_TWO_B: bool = 32u32.is_power_of_two();
8 const IS_POWER_OF_TWO_C: bool = 33u32.is_power_of_two();
10 const POW: u8 = 3u8.pow(5);
12 const CHECKED_POW_OK: Option<u8> = 3u8.checked_pow(5);
13 const CHECKED_POW_OVERFLOW: Option<u8> = 3u8.checked_pow(6);
15 const WRAPPING_POW: u8 = 3u8.wrapping_pow(6);
16 const OVERFLOWING_POW: (u8, bool) = 3u8.overflowing_pow(6);
17 const SATURATING_POW: u8 = 3u8.saturating_pow(6);
19 const NEXT_POWER_OF_TWO: u32 = 3u32.next_power_of_two();
21 const CHECKED_NEXT_POWER_OF_TWO_OK: Option<u32> = 3u32.checked_next_power_of_two();
22 const CHECKED_NEXT_POWER_OF_TWO_OVERFLOW: Option<u32> =
23 u32::MAX.checked_next_power_of_two();
25 const WRAPPING_NEXT_POWER_OF_TWO: u32 =
26 u32::MAX.wrapping_next_power_of_two();
29 assert!(!IS_POWER_OF_TWO_A);
30 assert!(IS_POWER_OF_TWO_B);
31 assert!(!IS_POWER_OF_TWO_C);
35 assert_eq!(CHECKED_POW_OK, Some(243));
36 assert_eq!(CHECKED_POW_OVERFLOW, None);
38 assert_eq!(WRAPPING_POW, 217);
39 assert_eq!(OVERFLOWING_POW, (217, true));
40 assert_eq!(SATURATING_POW, u8::MAX);
42 assert_eq!(NEXT_POWER_OF_TWO, 4);
44 assert_eq!(CHECKED_NEXT_POWER_OF_TWO_OK, Some(4));
45 assert_eq!(CHECKED_NEXT_POWER_OF_TWO_OVERFLOW, None);
47 assert_eq!(WRAPPING_NEXT_POWER_OF_TWO, 0);