[Bug libstdc++/52591] [C++0x] [4.7 Regression] moving std::vector relies on movable elements

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52591

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-03-15 00:36:22 UTC ---
(In reply to comment #1)
> Jon, can you have a look? I suspect it's just matter of telling apart cases in
> the move-assignment operator at compile time with templates instead of a normal
> conditional.

Oh I see what you mean, the untaken branch is instantiated anyway.

It's not possible to tell if the allocators are equal at compile-time and until
we implement DR 2103 (I have a patch) propagate_on_container_move_assignment is
false for std::allocator, so that branch will be taken in general.

Anyway, I'll look into it...