Re: [boost] Re: New version of valunion and stack_allocator uploaded

From: Douglas Gregor (gregod_at_[hidden])
Date: 2002-03-01 10:31:18

On Friday 01 March 2002 10:16 am, you wrote:
> >         template<typename T, size_t sz, size_t align>
> >         struct member {
> >           typedef typename ct_if<sizeof(T) <= sz && sizeof(U) <= align,
>
> What is 'U'?

My typo :(. It was supposed to be T.

> >                                   T,
> >                                   char>::type type;
> >         };
> >
> >         template<size_t sz, size_t align>
> > union force_align {
>
> What are 'sz' and 'align'?

The size and alignment of the type for which we want an alignment type. E.g., 
if we need to create aligned storage for std::string, we could use:

union std_string_raw_storage {
  force_align<sizeof(std::string), alignment_of<std::string>::value>::type 
align1;
  
  char buffer[sizeof(std::string)];
};

        Doug