[boost] Fw: Function pointers, result_of<> and function_traits<>

From: Peter Dimov (pdimov_at_[hidden])
Date: 2005-04-27 18:08:12

This post to boost-users describes what sounds like a bug in result_of.

Delfin Rojas wrote:
> Hello all,
> 
> I am trying to get the return type of a member function given its
> signature. Consider the following example from the boost result_of
> test: 
> 
> struct X {};
> 
> int main
> {
> using namespace boost;
>      typedef int (X::*mem_func_ptr)(float);
> 
> BOOST_STATIC_ASSERT((is_same<result_of<mem_func_ptr(X,char)>::type,
> int>::value));
> }
> 
> This test compiles/runs with no problems. Now, what I want is the
> return type of a function with signature "int (X::*)()"
> 
> I added the following to the test:
> 
> typedef int (X::*empty_mem_func_ptr)();
> 
> BOOST_STATIC_ASSERT((is_same<result_of<empty_mem_func_ptr(X)>::type,
> int>::value));
> 
> This does not compile. I get an error
> boost_1_32_0\boost\utility\result_of.hpp(43) : error C2825:
> 'F::template': cannot form a qualified name.
> 
> I tried to do this same thing with function_traits but it seems
> function traits does not support member function pointers at all.
> 
> So this is all I have. If somebody can help me I would appreciate it.
> 
> Thanks
> 
> -delfin
> 
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