Re: [boost] Text_archives don't support integer types?

From: Marcin Tustin (mt_at_[hidden])
Date: 2005-06-14 04:37:16

Robert Ramey <ramey <at> rrsd.com> writes:

> 
> As the library implemenation is based on templates, there is no need to
> specify all types.  Any type not specifically mentioned, is checked to see
> if its a prmitive, ie int, long etc.  If so, there is code to handle it.
> This is almost necessary because every platform has different types for
> things like 64 bit integers, etc.
> 
> Note that std::string is special in that it is treated as a primitive.  This
> is the only such special case.
> 
> ar << rhs
> 
> will not work for all right hand sides.  If rhs is the return from a
> function call, then it is a temporary variable with only a temporary
> address.  In such a case, ask yourself what ar >> rhs would mean?  If rhs is
> a function call returning a reference to a const obect the above will work -
> but you might have to do some tweaking wiht ar >> rhs.

  I'm probably being dense, but what is the connection between ar >> rhs not
working because rhs is a function call, and ar << rhs where rhs is a function
call, in the case that load and save are split? If it's a temporary int on the
stack, what's the complexity?

  Also, how is the library "detecting" that I'm doing ar << foo();, and then
failing during compilation, rather than ar << x;?