/* Metrowerks Standard Library
 * Copyright  1995-2004 Metrowerks Corporation.  All rights reserved.
 *
 * $Date: 2004/06/15 14:11:43 $
 * $Revision: 1.11.2.1 $
 */

// functional_ext

/*
 *
 * Copyright (c) 1994
 * Hewlett-Packard Company
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Hewlett-Packard Company makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 *
 * Copyright (c) 1996,1997
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 */

#ifndef _FUNCTIONAL_EXT
#define _FUNCTIONAL_EXT

#include <mslconfig>
#include <functional>

#ifndef RC_INVOKED

#ifdef __MWERKS__
#pragma options align=native
#endif

#ifdef _MSL_FORCE_ENUMS_ALWAYS_INT
	#if _MSL_FORCE_ENUMS_ALWAYS_INT
		#pragma enumsalwaysint on
	#else
		#pragma enumsalwaysint off
	#endif
#endif  // _MSL_FORCE_ENUMS_ALWAYS_INT

#ifdef _MSL_FORCE_ENABLE_BOOL_SUPPORT
	#if _MSL_FORCE_ENABLE_BOOL_SUPPORT
		#pragma bool on
	#else
		#pragma bool off
	#endif
#endif  // _MSL_FORCE_ENABLE_BOOL_SUPPORT

#ifndef _MSL_NO_CPP_NAMESPACE
	namespace std {
#endif

// identity is an extensions: it is not part of the standard.
template <class _Tp>
struct _Identity : public unary_function<_Tp,_Tp> {
  const _Tp& operator()(const _Tp& __x) const { return __x; }
};

template <class _Tp> struct identity : public _Identity<_Tp> {};

// select1st and select2nd are extensions: they are not part of the standard.
template <class _Pair>
struct _Select1st : public unary_function<_Pair, typename _Pair::first_type> {
  const typename _Pair::first_type& operator()(const _Pair& __x) const {
    return __x.first;
  }
};

template <class _Pair>
struct _Select2nd : public unary_function<_Pair, typename _Pair::second_type>
{
  const typename _Pair::second_type& operator()(const _Pair& __x) const {
    return __x.second;
  }
};

template <class _Pair> struct select1st : public _Select1st<_Pair> {};
template <class _Pair> struct select2nd : public _Select2nd<_Pair> {};

// unary_compose and binary_compose (extensions, not part of the standard).

template <class _Operation1, class _Operation2>
class unary_compose
  : public unary_function<typename _Operation2::argument_type,
                          typename _Operation1::result_type>
{
protected:
  _Operation1 _M_fn1;
  _Operation2 _M_fn2;
public:
  unary_compose(const _Operation1& __x, const _Operation2& __y)
    : _M_fn1(__x), _M_fn2(__y) {}
  typename _Operation1::result_type
  operator()(const typename _Operation2::argument_type& __x) const {
    return _M_fn1(_M_fn2(__x));
  }
};

template <class _Operation1, class _Operation2>
inline unary_compose<_Operation1,_Operation2>
compose1(const _Operation1& __fn1, const _Operation2& __fn2)
{
  return unary_compose<_Operation1,_Operation2>(__fn1, __fn2);
}

template <class _Operation1, class _Operation2, class _Operation3>
class binary_compose
  : public unary_function<typename _Operation2::argument_type,
                          typename _Operation1::result_type> {
protected:
  _Operation1 _M_fn1;
  _Operation2 _M_fn2;
  _Operation3 _M_fn3;
public:
  binary_compose(const _Operation1& __x, const _Operation2& __y,
                 const _Operation3& __z)
    : _M_fn1(__x), _M_fn2(__y), _M_fn3(__z) { }
  typename _Operation1::result_type
  operator()(const typename _Operation2::argument_type& __x) const {
    return _M_fn1(_M_fn2(__x), _M_fn3(__x));
  }
};

template <class _Operation1, class _Operation2, class _Operation3>
inline binary_compose<_Operation1, _Operation2, _Operation3>
compose2(const _Operation1& __fn1, const _Operation2& __fn2,
         const _Operation3& __fn3)
{
  return binary_compose<_Operation1,_Operation2,_Operation3>
    (__fn1, __fn2, __fn3);
}

#ifndef _MSL_NO_CPP_NAMESPACE
	} // namespace std
#endif

#ifdef _MSL_FORCE_ENUMS_ALWAYS_INT
	#pragma enumsalwaysint reset
#endif

#ifdef _MSL_FORCE_ENABLE_BOOL_SUPPORT
	#pragma bool reset
#endif

#ifdef __MWERKS__
#pragma options align=reset
#endif

#endif // RC_INVOKED

#endif // _FUNCTIONAL_EXT

// hh 990723 Created
// hh 010402 Removed 68K CMF support
