[Boost-users] function_traits<> help, ASAP please!

From: Hossein Haeri (powerprogman_at_[hidden])
Date: 2004-12-25 08:02:15

Dear all,

According to the Boost.Type_Traits I guess that
function_traits<> is supposed to be of the most docile
ones. After all it's got a few lines of comment...

Don't know how, and why, but the following plain-jane
programme

#include <iostream>
#include "boost\type_traits\function_traits.hpp"

int main()
{
  typedef void (*FType) ();
  typedef 
    typename 
      boost::function_traits<FType>
        ::result_type return_type;

  cin.get();
  return 0;
}

Gives me the following error under GCC 3.3.1 (which
I'm sure supports partial template specialisation):

Compiler: Default compiler
Building Makefile: "C:\Documents and
Settings\Hossein\My Documents\My
Programmes\Probability
I\Distributions\7.2.1\Makefile.win"
Executing  make...
make.exe -f "C:\Documents and Settings\Hossein\My
Documents\My Programmes\Probability
I\Distributions\7.2.1\Makefile.win" all
g++.exe -D__DEBUG__ -c 7_2_1Main.cpp -o 7_2_1Main.o
-I"C:/Dev-Cpp/include/c++/3.3.1" 
-I"C:/Dev-Cpp/include/c++/3.3.1/mingw32" 
-I"C:/Dev-Cpp/include/c++/3.3.1/backward" 
-I"C:/Dev-Cpp/lib/gcc-lib/mingw32/3.3.1/include" 
-I"C:/Dev-Cpp/include"    -pg -g3

7_2_1Main.cpp: In instantiation of
`boost::function_traits<void (*)()>':
7_2_1Main.cpp:57:   instantiated from here
7_2_1Main.cpp:57: error: base class
`boost::detail::function_traits_helper<void 
   (**)()>' has incomplete type
7_2_1Main.cpp: In function `int main()':
7_2_1Main.cpp:57: error: no type named `result_type'
in `struct 
   boost::function_traits<void (*)()>'
7_2_1Main.cpp:57: error: using `typename' outside of
template
7_2_1Main.cpp:57: error: ISO C++ forbids declaration
of `return_type' with no 
   type
make.exe: *** [7_2_1Main.o] Error 1

Execution terminated

Is he right? Is there anything particular I should had
done, and I've not?

TIA,
--Hossein

                
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