[boost] Type traits change alert

From: John Maddock (john_at_[hidden])
Date: 2005-01-30 11:03:48

Hi folks,

Its that time of year again when type traits gets a bit of maintenance, and 
as some of you will know, almost any change is guaranteed to break 
something, so here are the changes just in case:

1) The existing traits classes have been modified to inherit from 
boost::integral_constant, as per TR1.  I've done everything I can to retain 
MPL compatibility, and tested every way I can think of, but you never know 
something may go wrong somewhere... I've also had to defer this change for 
VC6 in one case (couldn't get variant to compile unless alignment_of 
inherited from mpl::size_t; even using mpl::integral_c as a base just made 
VC6 ICE all the time).

2) The addition of true_type/false_type meant a minor change to 
boost/pending/ct_if.hpp.

3) New traits classes added:  aligned_storage, extent, 
has_virtual_destructor, is_member_object_pointer, is_signed, is_unsigned, 
rank, remove_all_extents, all as per the TR.  There is just about an outside 
chance that old and broken compilers will be unable to parse one of these 
when including boost/type_traits.hpp, but it's pretty unlikely.

4) Renamed:

remove_bounds -> remove_extent
is_base_and_derived -> is_base_of
is_float -> is_floating_point

To bring those names into line with the TR, the old names all remain as well 
for backwards compatibility.

5) Docs:  these really need rewriting (Boostbook?), will do when I get a 
chance.

Regards,

John Maddock.