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/*
* Copyright 2002, The libsigc++ Development Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef _SIGC_TYPE_TRAIT_H_
#define _SIGC_TYPE_TRAIT_H_
#include <sigc++/reference_wrapper.h>
namespace sigc {
template <class T_type>
struct type_trait
{
typedef T_type type;
typedef T_type& pass;
typedef const T_type& take;
typedef T_type* pointer;
};
template <class T_type, int N>
struct type_trait<T_type[N]>
{
typedef T_type* type;
typedef T_type*& pass;
typedef const T_type*& take;
typedef T_type** pointer;
};
template <class T_type>
struct type_trait<T_type&>
{
typedef T_type type;
typedef T_type& pass;
typedef T_type& take;
typedef T_type* pointer;
};
template <class T_type>
struct type_trait<const T_type&>
{
typedef const T_type type;
typedef const T_type& pass;
typedef const T_type& take;
typedef const T_type* pointer;
};
template <class T_type>
struct type_trait<reference_wrapper<T_type> >
{
typedef T_type type;
typedef T_type& pass;
typedef T_type& take;
typedef T_type* pointer;
};
template <class T_type>
struct type_trait<const_reference_wrapper<T_type> >
{
typedef T_type type;
typedef T_type& pass;
typedef const T_type& take;
typedef T_type* pointer;
};
template<>
struct type_trait<void>
{
typedef void type;
typedef void pass;
typedef void take;
typedef void* pointer;
};
/** From Esa Pulkkin:
* Compile-time determination of base-class relationship in C++
* (adapted to match the syntax of boost's type_traits library).
*/
template <class T_base, class T_derived>
struct is_base_and_derived
{
private:
struct big {
char memory[64];
};
struct test {
static big is_base_class_(...);
static char is_base_class_(typename type_trait<T_base>::pointer);
};
public:
static const bool value =
sizeof(test::is_base_class_((typename type_trait<T_derived>::pointer)0)) ==
sizeof(char);
};
template <class T_base>
struct is_base_and_derived<T_base, T_base>
{
static const bool value = true;
};
} /* namespace sigc */
#endif /* _SIGC_TYPE_TRAIT_H_ */
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