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| author | bors <bors@rust-lang.org> | 2014-12-20 01:12:19 +0000 |
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| committer | bors <bors@rust-lang.org> | 2014-12-20 01:12:19 +0000 |
| commit | 1c2df5cc3cfc0c9e80adf9fa6504d55056741c5a (patch) | |
| tree | d9d1841b7f7a7f562a1d3288b98ceba78915a39b /src/libstd/sys/unix/stack_overflow.rs | |
| parent | cbe9fb45bc705a89f23b434c686544d490923596 (diff) | |
| parent | f6328b60da4c506f0f15dc0194f9b9a89aa61a79 (diff) | |
| download | rust-1c2df5cc3cfc0c9e80adf9fa6504d55056741c5a.tar.gz rust-1c2df5cc3cfc0c9e80adf9fa6504d55056741c5a.zip | |
auto merge of #19640 : aliblong/rust/power_of_two_reform, r=Gankro
The `is_power_of_two()` method of the `UnsignedInt` trait currently returns `true` for `self == 0`. Zero is not a power of two, assuming an integral exponent `k >= 0`. I've therefore moved this functionality to the new method `is_power_of_two_or_zero()` and reformed `is_power_of_two()` to return false for `self == 0`. To illustrate the usefulness of the existence of both functions, consider `HashMap`. Its capacity must be zero or a power of two; conversely, it also requires a (non-zero) power of two for key and val alignment. Also, added a small amount of documentation regarding #18604.
Diffstat (limited to 'src/libstd/sys/unix/stack_overflow.rs')
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