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assert_eq!(1000_i32.ilog10(), 3); assert_eq!(10000_i32.ilog10(), 4); assert_eq!(100000_i32.ilog10(), 5); assert_eq!(0b1000_i32.ilog2(), 3); assert_eq!(0b10000_i32.ilog2(), 4); assert_eq!(0b100000_i32.ilog2(), 5); assert_eq!(0x1000_i32.ilog(16), 3); assert_eq!(0x10000_i32.ilog(16), 4); assert_eq!(0x100000_i32.ilog(16), 5);

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assert_eq!(1000_i32.ilog10(), 3); assert_eq!(10000_i32.ilog10(), 4); assert_eq!(100000_i32.ilog10(), 5); assert_eq!(0b1000_i32.ilog2(), 3); assert_eq!(0b10000_i32.ilog2(), 4); assert_eq!(0b100000_i32.ilog2(), 5); assert_eq!(0x1000_i32.ilog(16), 3); assert_eq!(0x10000_i32.ilog(16), 4); assert_eq!(0x100000_i32.ilog(16), 5);
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Mara (mara@hachyderm.io)'s status on Tuesday, 14-Mar-2023 22:52:19 JST Mara
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The integer types now have (integer) logarithm methods: ilog, ilog10, ilog2. (And zero-checking versions: checked_ilog, checked_ilog10, and checked_ilog2.)
ilog2 is implemented using leading_zeros(), so is very efficient.
All of these methods usable in const context too.
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In conversation Tuesday, 14-Mar-2023 22:52:19 JST from hachyderm.io permalink