Re: [boost] safe-bool CRTP class

Subject: Re: [boost] safe-bool CRTP class
From: Stephan T. Lavavej (stl_at_[hidden])
Date: 2011-05-28 20:26:39

[Jeffrey Lee Hellrung, Jr.]
> struct _boost_explicit_operator_bool_struct { int _dummy; int member; }; \

[STL]
> You don't need two data members.

[Jeffrey Lee Hellrung, Jr.]
> According to Andrey Semashev (to whom I credit the technique to, and
> should've cited in the above post), you do need two data members, as some
> compilers interpret a pointer-to-first-member as equal to 0 (i.e.,
> convertible to false).  I honestly don't know if such compilers exist or are
> technically allowed to do that...

That would be crazy nonconformant. And depressing if true.

STL