48 lines
1.4 KiB
Rust
48 lines
1.4 KiB
Rust
//@ run-pass
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#![feature(wrapping_next_power_of_two)]
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const IS_POWER_OF_TWO_A: bool = 0u32.is_power_of_two();
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const IS_POWER_OF_TWO_B: bool = 32u32.is_power_of_two();
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const IS_POWER_OF_TWO_C: bool = 33u32.is_power_of_two();
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const POW: u8 = 3u8.pow(5);
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const CHECKED_POW_OK: Option<u8> = 3u8.checked_pow(5);
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const CHECKED_POW_OVERFLOW: Option<u8> = 3u8.checked_pow(6);
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const WRAPPING_POW: u8 = 3u8.wrapping_pow(6);
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const OVERFLOWING_POW: (u8, bool) = 3u8.overflowing_pow(6);
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const SATURATING_POW: u8 = 3u8.saturating_pow(6);
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const NEXT_POWER_OF_TWO: u32 = 3u32.next_power_of_two();
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const CHECKED_NEXT_POWER_OF_TWO_OK: Option<u32> = 3u32.checked_next_power_of_two();
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const CHECKED_NEXT_POWER_OF_TWO_OVERFLOW: Option<u32> =
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u32::MAX.checked_next_power_of_two();
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const WRAPPING_NEXT_POWER_OF_TWO: u32 =
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u32::MAX.wrapping_next_power_of_two();
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fn main() {
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assert!(!IS_POWER_OF_TWO_A);
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assert!(IS_POWER_OF_TWO_B);
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assert!(!IS_POWER_OF_TWO_C);
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assert_eq!(POW, 243);
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assert_eq!(CHECKED_POW_OK, Some(243));
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assert_eq!(CHECKED_POW_OVERFLOW, None);
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assert_eq!(WRAPPING_POW, 217);
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assert_eq!(OVERFLOWING_POW, (217, true));
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assert_eq!(SATURATING_POW, u8::MAX);
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assert_eq!(NEXT_POWER_OF_TWO, 4);
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assert_eq!(CHECKED_NEXT_POWER_OF_TWO_OK, Some(4));
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assert_eq!(CHECKED_NEXT_POWER_OF_TWO_OVERFLOW, None);
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assert_eq!(WRAPPING_NEXT_POWER_OF_TWO, 0);
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}
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