/*

 *

 * Copyright (c) 1994

 * Hewlett-Packard Company

 *

 * Copyright (c) 1996-1998

 * Silicon Graphics Computer Systems, Inc.

 *

 * Copyright (c) 1997

 * Moscow Center for SPARC Technology

 *

 * Copyright (c) 1999 

 * Boris Fomitchev

 *

 * This material is provided "as is", with absolutely no warranty expressed

 * or implied. Any use is at your own risk.

 *

 * Permission to use or copy this software for any purpose is hereby granted 

 * without fee, provided the above notices are retained on all copies.

 * Permission to modify the code and to distribute modified code is granted,

 * provided the above notices are retained, and a notice that the code was

 * modified is included with the above copyright notice.

 *

 */

/* NOTE: This is an internal header file, included by other STL headers.

 *   You should not attempt to use it directly.

 */

#ifndef _STLP_INTERNAL_FUNCTION_BASE_H

#define _STLP_INTERNAL_FUNCTION_BASE_H

#ifndef _STLP_CONFIG_H

#include <stl/_config.h>

#endif

_STLP_BEGIN_NAMESPACE

template <class _Arg, class _Result>

struct unary_function {

  typedef _Arg argument_type;

  typedef _Result result_type;

};

template <class _Arg1, class _Arg2, class _Result>

struct binary_function {

  typedef _Arg1 first_argument_type;

  typedef _Arg2 second_argument_type;

  typedef _Result result_type;

};      

template <class _Tp>

struct equal_to : public binary_function<_Tp,_Tp,bool> 

{

  bool operator()(const _Tp& __x, const _Tp& __y) const { return __x == __y; }

};

template <class _Tp>

struct not_equal_to : public binary_function<_Tp,_Tp,bool> 

{

  bool operator()(const _Tp& __x, const _Tp& __y) const { return __x != __y; }

};

template <class _Tp>

struct greater : public binary_function<_Tp,_Tp,bool> 

{

  bool operator()(const _Tp& __x, const _Tp& __y) const { return __x > __y; }

};

template <class _Tp>

struct less : public binary_function<_Tp,_Tp,bool> 

{

  bool operator()(const _Tp& __x, const _Tp& __y) const { return __x < __y; }

};

template <class _Tp>

struct greater_equal : public binary_function<_Tp,_Tp,bool>

{

  bool operator()(const _Tp& __x, const _Tp& __y) const { return __x >= __y; }

};

template <class _Tp>

struct less_equal : public binary_function<_Tp,_Tp,bool> 

{

  bool operator()(const _Tp& __x, const _Tp& __y) const { return __x <= __y; }

};

template <class _Tp>

less<_Tp> __less(_Tp* ) { return less<_Tp>(); }

template <class _Tp>

equal_to<_Tp> __equal_to(_Tp* ) { return equal_to<_Tp>(); }

template <class _Tp>

struct plus : public binary_function<_Tp,_Tp,_Tp> {

  _Tp operator()(const _Tp& __x, const _Tp& __y) const { return __x + __y; }

};

template <class _Tp>

struct minus : public binary_function<_Tp,_Tp,_Tp> {

  _Tp operator()(const _Tp& __x, const _Tp& __y) const { return __x - __y; }

};

template <class _Tp>

plus<_Tp> __plus(_Tp* ) { return plus<_Tp>(); }

template <class _Tp>

minus<_Tp> __minus(_Tp* ) { return minus<_Tp>(); }

template <class _Tp>

struct multiplies : public binary_function<_Tp,_Tp,_Tp> {

  _Tp operator()(const _Tp& __x, const _Tp& __y) const { return __x * __y; }

};

template <class _Tp>

struct divides : public binary_function<_Tp,_Tp,_Tp> {

  _Tp operator()(const _Tp& __x, const _Tp& __y) const { return __x / __y; }

};

template <class _Tp>

struct modulus : public binary_function<_Tp,_Tp,_Tp> 

{

  _Tp operator()(const _Tp& __x, const _Tp& __y) const { return __x % __y; }

};

template <class _Tp>

struct negate : public unary_function<_Tp,_Tp> 

{

  _Tp operator()(const _Tp& __x) const { return -__x; }

};

template <class _Tp>

struct logical_and : public binary_function<_Tp,_Tp,bool>

{

  bool operator()(const _Tp& __x, const _Tp& __y) const { return __x && __y; }

};

template <class _Tp>

struct logical_or : public binary_function<_Tp,_Tp,bool>

{

  bool operator()(const _Tp& __x, const _Tp& __y) const { return __x || __y; }

};

template <class _Tp>

struct logical_not : public unary_function<_Tp,bool>

{

  bool operator()(const _Tp& __x) const { return !__x; }

};

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;

  }

};

// project1st and project2nd are extensions: they are not part of the standard

template <class _Arg1, class _Arg2>

struct _Project1st : public binary_function<_Arg1, _Arg2, _Arg1> {

  _Arg1 operator()(const _Arg1& __x, const _Arg2&) const { return __x; }

};

template <class _Arg1, class _Arg2>

struct _Project2nd : public binary_function<_Arg1, _Arg2, _Arg2> {

  _Arg2 operator()(const _Arg1&, const _Arg2& __y) const { return __y; }

};

#ifdef _STLP_MULTI_CONST_TEMPLATE_ARG_BUG

// fbp : sort of select1st just for maps

template <class _Pair, class _Whatever>		

// JDJ (CW Pro1 doesn't like const when first_type is also const)

struct __Select1st_hint : public unary_function<_Pair, _Whatever> {

    const _Whatever& operator () (const _Pair& __x) const { return __x.first; }

};

# define  _STLP_SELECT1ST(__x,__y) __Select1st_hint< __x, __y >

# else

# define  _STLP_SELECT1ST(__x, __y) _Select1st< __x >

# endif

template <class _Tp>

struct _Identity : public unary_function<_Tp,_Tp> {

  const _Tp& operator()(const _Tp& __x) const { return __x; }

};

template <class _Result, class _Argument>

struct _Constant_unary_fun {

  typedef _Argument argument_type;

  typedef  _Result  result_type;

  result_type _M_val;

  _Constant_unary_fun(const result_type& __v) : _M_val(__v) {}

  const result_type& operator()(const _Argument&) const { return _M_val; }

};

template <class _Result, class _Arg1, class _Arg2>

struct _Constant_binary_fun {

  typedef  _Arg1   first_argument_type;

  typedef  _Arg2   second_argument_type;

  typedef  _Result result_type;

  _Result _M_val;

  _Constant_binary_fun(const _Result& __v) : _M_val(__v) {}

  const result_type& operator()(const _Arg1&, const _Arg2&) const {

    return _M_val;

  }

};

// identity_element (not part of the C++ standard).

template <class _Tp> inline _Tp __identity_element(plus<_Tp>) {  return _Tp(0); }

template <class _Tp> inline _Tp __identity_element(multiplies<_Tp>) { return _Tp(1); }

_STLP_END_NAMESPACE

#endif /* _STLP_INTERNAL_FUNCTION_BASE_H */

// Local Variables:

// mode:C++

// End: