Re: Initializing without assigning
Frederick Gotham wrote:
Victor Bazarov posted:
Aligned buf[
sizeof(string) / sizeof(Aligned)
+ !!(sizeof(string) % sizeof(Aligned)) ];
Could you elaborate what this all is for? What are you trying
to accomplish with all that?
You can't do the following, because the array might not be aligned
properly to accommodate a particular type:
char buffer[sizeof(T)];
::new(buffer) T;
A possible solution would be to use a union to ensure correct
alignment.
And how using the union you used with a 'void*', a 'long', and
a 'long double' going to accomplish "correct alignment"?
(Have you not seen this "trick" before? It's quite common.)
No, I haven't. Not to say that I've seen all the code in the world,
of course. It does strike me as strange that instead of simply
declaring a local object of type 'std::string' you declare an array
of some weird union type and then use placement new to allocate
a string. And you're saying that it's *quite common*? Indeed...
V
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