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

Subject: Re: [boost] [forward_declare] Interest Inquiry toward Faster Compile Times
From: Sergey Cheban (s.cheban_at_[hidden])
Date: 2012-08-02 01:59:37

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