[boost] [type_traits] VC++ and vararg function/mmeber functions and varargs

Subject: [boost] [type_traits] VC++ and vararg function/mmeber functions and varargs
From: Edward Diener (eldiener_at_[hidden])
Date: 2013-10-07 18:50:15

After going back and for with Mr. Lavavej from Microsoft about how VC++ 
treats functions/member functions which have varargs parameters and 
calling conventions, I learned that VC++ always treats all these 
function types as if the calling convention is __cdecl, no matter what 
the end-user specifies.

Therefore attempting to match function and member function types taking 
varargs, with VC++ and compatibles, by having to specify __cdecl, 
__fastcall, and __stdcall calling conventions for every function/member 
function declaration with varargs, is a waste since these are not 
potential new types being tested by templates but just the same type 
redeclared. These occur in type_traits/detail files 
is_mem_fun_pointer_tester.hpp and is_mem_fun_pointer_tester.hpp when 
BOOST_TT_TEST_MS_FUNC_SIGS ( essentially _MSC_EXTENSIONS) is defined.

I would like to remove these redundant declarations from these files. I 
have made sure that my tests for VC++ pass. I will test Intel C++, if it 
also emulates VC++ in this way.

Can I make the change on trunk to these files once I ascertain that 
Intel C++ tests with type_traits also pass with this change ? Are there 
any other VC++ emulation compilers that need to be tested ?