Re: [boost] [1.35][functional] gcc-4.2:dereferencing type-punned pointer will break strict-aliasing rules

18 Apr 2008


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On Friday 18 April 2008 17:45 pm, Teemu Torma wrote:
...
Wouldn't casting using union be safe and efficient in all cases?
Something like:
inline std::size_t float_hash_impl(float v)
       {
              union { float v; std::size_t seed; } u;
              u.v = v;
              return u.seed;
       }
It's safe with gcc, but that is a gnu extension.  The standard only allows 
aliasing through char*.

- -- 
Frank
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Re: [boost] [1.35][functional] gcc-4.2:dereferencing type-punned pointer will break strict-aliasing rules

Frank Mori Hess