Re: [boost] [forward_declare] Interest Inquiry toward Faster Compile Times

2 Aug 2012

      02.08.2012 8:28, Daniel Larimer пишет:
...
Yes, _store[S] has an alignment requirement of 1, but what is the alignment requirement for fwd<T,S>?
It's probably 1 because _store has an alignment of 1.
Btw, what about the following?

template<typename T, size_t S, typename Alignment1=char, typename 
Alignment2=char, typename Alignment3=char>
struct fwd {
	fwd() {
		static_assert( sizeof(*this) >= sizeof(T), "!" );
		new (this) T();
	}	
	union {
		char _store[S];
		Alignment1 _alignment1;
		Alignment2 _alignment2;
		Alignment3 _alignment3;
	};
};

MSVC compiler has also an __alignof operator.

--
Best regards,
Sergey Cheban