From: Douglas Gregor (gregod_at_[hidden])
Date: 2002-02-04 10:10:48
On Monday 04 February 2002 07:59 am, you wrote:
> I think that if we add another template parameter to boost::function,
> Storage, with requirements that
> (1) sizeof(Storage) >= sizeof(void*),
Okay.
> (2) an object of type Storage always has the correct alignment for every
> type T such that sizeof(T) <= sizeof(Storage),
Just for reference - how is this accomplished? Portably?
> then (a) the implementation of boost::function could be simplified,
Going to have to go whip up some proof pudding on this one. I would
definately say that this small string optimization should be factored out
into its own library, because I'm sure there are many libraries that could
benefit from this. boost::any surely comes to mind, as it's been requested
before that boost::any support the small string optimization. Something like:
template<typename Storage = default_storage>
struct small_string_optimization {
template<typename T>
struct can_optimize {
BOOST_STATIC_CONSTANT(bool, value = /* whatever */);
};
template<typename T> T* storage(T* = 0 /* msvc hack */)
{ return /* pointer to internal storage */; }
};
Doug