Base 10 and 2 logarithm functions for integer types.
The IntLog trait defines the following methods:
rust
fn log10(self) -> usize
fn log2(self) -> usize
fn checked_log10(self) -> Option<usize>
fn checked_log2(self) -> Option<usize>
The log2 and log10 methods are optimized for the integer width and are
[inline] as long as the code remains small enough. They typically use constant tables
that are only stored once, even if the methods using them are inlined multiple times.
The checked versions of the methods, checked_log2 and checked_log10,
return None if the logarithm is undefined for the parameter value, whereas the unchecked
methods mentioned above simply panic. A default implementation is provided in the trait, and in
most cases they needn't be overidden.
```rust use ilog::IntLog;
let hundred: u32 = 100; asserteq!(hundred.log10(), 2); asserteq!(u32::log10(99), 1);
let value: u64 = 256; asserteq!(value.log2(), 8); asserteq!(u64::log2(255), 7);
asserteq!(u32::checkedlog2(63), Some(5)); asserteq!(0u32.checked_log2(), None); ```
Add this dependency to your Cargo.toml file:
toml
[dependencies]
ilog = "0"
The ilog crate is tested for rustc 1.65 and greater.
Licensed under MIT license.