I added specializations for member function pointers, and for those specializations, a typedef class_type which is the class type of the pointer. For no-PTS compilers I added a set of template functions for function pointers.
Unfortunely when I tried to test this by doing:
cout << boost::function<void (A::*)()>::arity << endl;
The following errors occured:
main.cpp: In instantiation of `boost::function_traits<void (A::*)()>':
main.cpp:33: instantiated from here
main.cpp:33: base class `boost::detail::function_traits_helper<void (A::**)()>'
has incomplete type
It looks like the add_pointer doesn't know what to do with member function pointers.
This may affect many things, so I didn't touch anything else :)
Would this affect boost::function? (from what I know it has some kind of member function pointer adaptor?)
Lin Xu
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// Copyright (C) 2000 John Maddock ([EMAIL PROTECTED])
//
// Permission to copy and use this software is granted,
// provided this copyright notice appears in all copies.
// Permission to modify the code and to distribute modified code is granted,
// provided this copyright notice appears in all copies, and a notice
// that the code was modified is included with the copyright notice.
//
// This software is provided "as is" without express or implied warranty,
// and with no claim as to its suitability for any purpose.
#ifndef BOOST_TT_FUNCTION_TRAITS_HPP_INCLUDED
#define BOOST_TT_FUNCTION_TRAITS_HPP_INCLUDED
#include <boost/config.hpp>
#include <boost/type_traits/is_function.hpp>
#include <boost/type_traits/add_pointer.hpp>
namespace boost {
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
namespace detail {
template<typename Function> struct function_traits_helper;
template<typename R>
struct function_traits_helper<R (*)(void)>
{
BOOST_STATIC_CONSTANT(int, arity = 0);
typedef R result_type;
};
template<typename R, typename T1>
struct function_traits_helper<R (*)(T1)>
{
BOOST_STATIC_CONSTANT(int, arity = 1);
typedef R result_type;
typedef T1 arg1_type;
};
template<typename R, typename T1, typename T2>
struct function_traits_helper<R (*)(T1, T2)>
{
BOOST_STATIC_CONSTANT(int, arity = 2);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
};
template<typename R, typename T1, typename T2, typename T3>
struct function_traits_helper<R (*)(T1, T2, T3)>
{
BOOST_STATIC_CONSTANT(int, arity = 3);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4>
struct function_traits_helper<R (*)(T1, T2, T3, T4)>
{
BOOST_STATIC_CONSTANT(int, arity = 4);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5>
struct function_traits_helper<R (*)(T1, T2, T3, T4, T5)>
{
BOOST_STATIC_CONSTANT(int, arity = 5);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6>
struct function_traits_helper<R (*)(T1, T2, T3, T4, T5, T6)>
{
BOOST_STATIC_CONSTANT(int, arity = 6);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
typedef T6 arg6_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7>
struct function_traits_helper<R (*)(T1, T2, T3, T4, T5, T6, T7)>
{
BOOST_STATIC_CONSTANT(int, arity = 7);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
typedef T6 arg6_type;
typedef T7 arg7_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename T8>
struct function_traits_helper<R (*)(T1, T2, T3, T4, T5, T6, T7, T8)>
{
BOOST_STATIC_CONSTANT(int, arity = 8);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
typedef T6 arg6_type;
typedef T7 arg7_type;
typedef T8 arg8_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename T8, typename T9>
struct function_traits_helper<R (*)(T1, T2, T3, T4, T5, T6, T7, T8, T9)>
{
BOOST_STATIC_CONSTANT(int, arity = 9);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
typedef T6 arg6_type;
typedef T7 arg7_type;
typedef T8 arg8_type;
typedef T9 arg9_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename T8, typename T9,
typename T10>
struct function_traits_helper<R (*)(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10)>
{
BOOST_STATIC_CONSTANT(int, arity = 10);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
typedef T6 arg6_type;
typedef T7 arg7_type;
typedef T8 arg8_type;
typedef T9 arg9_type;
typedef T10 arg10_type;
};
template<typename R, typename Class>
struct function_traits_helper<R (Class::*)(void)>
{
BOOST_STATIC_CONSTANT(int, arity = 0);
typedef Class class_type;
typedef R result_type;
};
template<typename R, typename T1, typename Class>
struct function_traits_helper<R (Class::*)(T1)>
{
BOOST_STATIC_CONSTANT(int, arity = 1);
typedef Class class_type;
typedef R result_type;
typedef T1 arg1_type;
};
template<typename R, typename T1, typename T2, typename Class>
struct function_traits_helper<R (Class::*)(T1, T2)>
{
BOOST_STATIC_CONSTANT(int, arity = 2);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef Class class_type;
};
template<typename R, typename T1, typename T2, typename T3, typename Class>
struct function_traits_helper<R (Class::*)(T1, T2, T3)>
{
BOOST_STATIC_CONSTANT(int, arity = 3);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef Class class_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename Class>
struct function_traits_helper<R (Class::*)(T1, T2, T3, T4)>
{
BOOST_STATIC_CONSTANT(int, arity = 4);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef Class class_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename Class>
struct function_traits_helper<R (Class::*)(T1, T2, T3, T4, T5)>
{
BOOST_STATIC_CONSTANT(int, arity = 5);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
typedef Class class_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename Class>
struct function_traits_helper<R (Class::*)(T1, T2, T3, T4, T5, T6)>
{
BOOST_STATIC_CONSTANT(int, arity = 6);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
typedef T6 arg6_type;
typedef Class class_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename Class>
struct function_traits_helper<R (Class::*)(T1, T2, T3, T4, T5, T6, T7)>
{
BOOST_STATIC_CONSTANT(int, arity = 7);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
typedef T6 arg6_type;
typedef T7 arg7_type;
typedef Class class_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename T8, typename Class>
struct function_traits_helper<R (Class::*)(T1, T2, T3, T4, T5, T6, T7, T8)>
{
BOOST_STATIC_CONSTANT(int, arity = 8);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
typedef T6 arg6_type;
typedef T7 arg7_type;
typedef T8 arg8_type;
typedef Class class_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename T8, typename T9,
typename Class>
struct function_traits_helper
<R (Class::*)(T1, T2, T3, T4, T5, T6, T7, T8, T9)>
{
BOOST_STATIC_CONSTANT(int, arity = 9);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
typedef T6 arg6_type;
typedef T7 arg7_type;
typedef T8 arg8_type;
typedef T9 arg9_type;
typedef Class class_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename T8, typename T9,
typename T10, typename Class>
struct function_traits_helper
<R (Class::*)(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10)>
{
BOOST_STATIC_CONSTANT(int, arity = 10);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
typedef T6 arg6_type;
typedef T7 arg7_type;
typedef T8 arg8_type;
typedef T9 arg9_type;
typedef T10 arg10_type;
typedef Class class_type;
};
} // end namespace detail
template<typename Function>
struct function_traits :
public detail::function_traits_helper<typename add_pointer<Function>::type>
{
};
#else
namespace detail {
template<int N>
struct type_of_size
{
char elements[N];
};
template<typename R>
type_of_size<1> function_arity_helper(R (*f)());
template<typename R, typename T1>
type_of_size<2> function_arity_helper(R (*f)(T1));
template<typename R, typename T1, typename T2>
type_of_size<3> function_arity_helper(R (*f)(T1, T2));
template<typename R, typename T1, typename T2, typename T3>
type_of_size<4> function_arity_helper(R (*f)(T1, T2, T3));
template<typename R, typename T1, typename T2, typename T3, typename T4>
type_of_size<5> function_arity_helper(R (*f)(T1, T2, T3, T4));
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5>
type_of_size<6> function_arity_helper(R (*f)(T1, T2, T3, T4, T5));
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6>
type_of_size<7> function_arity_helper(R (*f)(T1, T2, T3, T4, T5, T6));
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7>
type_of_size<8> function_arity_helper(R (*f)(T1, T2, T3, T4, T5, T6, T7));
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename T8>
type_of_size<9> function_arity_helper(R (*f)(T1, T2, T3, T4, T5, T6, T7, T8));
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename T8, typename T9>
type_of_size<10> function_arity_helper(R (*f)(T1, T2, T3, T4, T5, T6, T7, T8,
T9));
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename T8, typename T9,
typename T10>
type_of_size<11> function_arity_helper(R (*f)(T1, T2, T3, T4, T5, T6, T7, T8,
T9, T10));
template<typename R, typename Class>
type_of_size<1> function_arity_helper(R (Class::*f)());
template<typename R, typename T1, typename Class>
type_of_size<2> function_arity_helper(R (Class::*f)(T1));
template<typename R, typename T1, typename T2, typename Class>
type_of_size<3> function_arity_helper(R (Class::*f)(T1, T2));
template<typename R, typename T1, typename T2, typename T3, typename Class>
type_of_size<4> function_arity_helper(R (Class::*f)(T1, T2, T3));
template<typename R, typename T1, typename T2, typename T3, typename T4
typename Class>
type_of_size<5> function_arity_helper(R (Class::*f)(T1, T2, T3, T4));
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename Class>
type_of_size<6> function_arity_helper(R (Class::*f)(T1, T2, T3, T4, T5));
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename Class>
type_of_size<7> function_arity_helper(R (Class::*f)(T1, T2, T3, T4, T5, T6));
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename Class>
type_of_size<8> function_arity_helper(R (Class::*f)(T1, T2, T3, T4, T5, T6,
T7));
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename T8, typename Class>
type_of_size<9> function_arity_helper(R (Class::*f)(T1, T2, T3, T4, T5, T6, T7,
T8));
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename T8, typename T9
typename Class>
type_of_size<10> function_arity_helper(R (Class::*f)(T1, T2, T3, T4, T5, T6, T7,
T8, T9));
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename T8, typename T9,
typename T10, typename Class>
type_of_size<11> function_arity_helper(R (Class::*f)(T1, T2, T3, T4, T5, T6, T7,
T8, T9, T10));
} // end namespace detail
// Won't work with references
template<typename Function>
struct function_traits
{
BOOST_STATIC_CONSTANT(int, arity = (sizeof(detail::function_arity_helper((Function*)0))-1));
};
#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
}
#endif // BOOST_TT_FUNCTION_TRAITS_HPP_INCLUDED
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