On Tue, 2005-07-05 at 20:05 +0200, Gabriel Dos Reis wrote: > Paolo Carlin > It is definitely a good thing to use the full bits of value > representation if we ever want to make all "interesting" bits part of > the hash value. For reasonable or sane representations it suffices to > get your hand on the object representation, e.g.: > > const int objsize = sizeof (double); > typedef unsigned char objrep_t[objsize]; > double x = ....; > objrep_t& p = reintepret_cast<objrep_t&>(x); > // ... > > and let frexp and friends only for less obvious value representation.
most architectures have different bit representations for +0.0 and -0.0, yet the two values compare equal.
