Boost C++ Libraries: Ticket #4038: hash_value(float) collision

status changed

Daniel James — Wed, 24 Mar 2010 08:28:31 GMT

status new → assigned

Because in cross platform development there's no guarantee that two floats with different binary representations will be unequal, and there's no guarantee that the binary representation will be the same size as std::size_t. I do use a binary algorithm on a limited number of platforms, and could for others, but it has to be done carefully and there are more important things to do.

Daniel James — Wed, 24 Mar 2010 08:49:02 GMT

(In [60805]) Remove optimization which causes 0.5 to hash to 0. Refs #4038.

I have an internal requirement the 0 hashes to 0, a better solution might be to remove that, put the optimization back and hash 0 to another value. Or alternatively, use the main combine function instead.

status changed; resolution set

Daniel James — Wed, 31 Mar 2010 21:39:13 GMT

status assigned → closed
resolution → fixed

(In [60980]) Merge from trunk.

Add quick_erase for unordered. erase_return_void is now deprecated. Fixes #3966
Avoid collision between 0 and 0.5. Fixes #4038