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From: Hamish Mackenzie (hamish_at_[hidden])
Date: 2003-08-29 13:26:42

Also "swap" is often the fastest way to move an non POD. I spent some
time writing something similar to what you describe...

The idea is that you have four ways to move an object depending on
whether you need to construct the destination or destroy the source.

   move_to( destination ) = move_from( source );
   move_to_construct( destination ) = move_from( source );
   move_to_construct( destination ) = move_from_destroy( source )
   move_to( destination ) = move_from_destroy( source )

I started trying to expand on this to work with moving blocks. I am
afraid I didn't get very far before more pressing matters came up. I'll
see if I can find any more of the code.


On Mon, 2003-08-25 at 12:39, Pavel Vozenilek wrote:
> In many cases using memcpy() is faster than copying array of objects one by
> one. NTL ( claims huge performance gains over STL
> using it.
> Type traits library may be extended with:
> - memcpy_copyable<> and
> - memcpy_moveable<>
> These traits will be specialised for primitive types, pointers,
> std::complex, etc. and users will be able to define then for their own
> types. Some types may be moveable but not copyable (e.g. typical
> std::string).
> Containers and algorithms then can take advantage of memcpy() where
> possible.
> While it is possible for each individual library define such a traits,
> having them in Boost.TypeTraits would make them (pseudo)standard.
> /Pavel
> _______________________________________________
> Unsubscribe & other changes:

Hamish Mackenzie <hamish_at_[hidden]>

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