Re: [boost] Allocators in VC 8.0?

From: John Maddock (john_at_[hidden])
Date: 2005-05-10 06:29:16

> Does anyone know of any weird behavior from allocators in VC 8.0? The 
> Function library uses allocators when available, but the two tests of 
> allocators (allocator_test and function_test) are failing on VC 8.0 (but 
> not 7.1). From the config info, I see that BOOST_HAS_PARTIAL_STD_ALLOCATOR 
> is defined but BOOST_NO_STD_ALLOCATOR is not (boost::function uses the 
> latter).
>
> The actual failure is here: http://tinyurl.com/dq3lh
> Could someone with access to VC 8.0 (beta 2, I guess) check to see what is 
> happening here?

It's the first fallout from the recent type_traits changes, but it's a bug 
in the test case that's being exposed:

Boost::function doesn't allocate any storage if the function object is 
stateless, and VC8 is now the first compiler to automatically detect 
stateless user-defined types via is_stateless, so Boost.Function assignment 
goes via:

template<typename FunctionObj>
void assign_to(FunctionObj, detail::function::stateless_function_obj_tag)

which doesn't use an allocator at all, hence the failed tests.

I think the solution is to fix the tests to use function objects that do 
have state.

HTH,

John.