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/*
*
* 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
#if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION) && !defined (_STLP_TYPE_TRAITS_H)
# include <stl/type_traits.h>
#endif
_STLP_BEGIN_NAMESPACE
template <class _Arg, class _Result>
struct unary_function {
typedef _Arg argument_type;
typedef _Result result_type;
#if !defined (__BORLANDC__) || (__BORLANDC__ < 0x580)
protected:
/* This class purpose is to be derived but it is not polymorphic so users should never try
* to destroy an instance of it directly. The protected non-virtual destructor make this
* fact obvious at compilation time. */
~unary_function() {}
#endif
};
template <class _Arg1, class _Arg2, class _Result>
struct binary_function {
typedef _Arg1 first_argument_type;
typedef _Arg2 second_argument_type;
typedef _Result result_type;
#if !defined (__BORLANDC__) || (__BORLANDC__ < 0x580)
protected:
/* See unary_function comment. */
~binary_function() {}
#endif
};
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 less : public binary_function<_Tp,_Tp,bool>
#if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION)
/* less is the default template parameter for many STL containers, to fully use
* the move constructor feature we need to know that the default less is just a
* functor.
*/
, public __stlport_class<less<_Tp> >
#endif
{
bool operator()(const _Tp& __x, const _Tp& __y) const { return __x < __y; }
#if defined (_STLP_USE_PARTIAL_SPEC_WORKAROUND) && !defined (_STLP_FUNCTION_TMPL_PARTIAL_ORDER)
void _M_swap_workaround(less<_Tp>& __x) {}
#endif
};
#if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION)
template <class _Tp>
struct __type_traits<less<_Tp> > {
#if !defined (__BORLANDC__)
typedef typename _IsSTLportClass<less<_Tp> >::_Ret _STLportLess;
#else
enum { _Is = _IsSTLportClass<less<_Tp> >::_Is };
typedef typename __bool2type<_Is>::_Ret _STLportLess;
#endif
typedef _STLportLess has_trivial_default_constructor;
typedef _STLportLess has_trivial_copy_constructor;
typedef _STLportLess has_trivial_assignment_operator;
typedef _STLportLess has_trivial_destructor;
typedef _STLportLess is_POD_type;
};
#endif
_STLP_MOVE_TO_PRIV_NAMESPACE
template <class _Tp>
less<_Tp> __less(_Tp* ) { return less<_Tp>(); }
template <class _Tp>
equal_to<_Tp> __equal_to(_Tp* ) { return equal_to<_Tp>(); }
_STLP_MOVE_TO_STD_NAMESPACE
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; }
};
_STLP_MOVE_TO_PRIV_NAMESPACE
template <class _Tp>
plus<_Tp> __plus(_Tp* ) { return plus<_Tp>(); }
template <class _Tp>
minus<_Tp> __minus(_Tp* ) { return minus<_Tp>(); }
_STLP_MOVE_TO_STD_NAMESPACE
template <class _Tp>
struct multiplies : public binary_function<_Tp, _Tp, _Tp> {
_Tp operator()(const _Tp& __x, const _Tp& __y) const { return __x * __y; }
};
_STLP_MOVE_TO_PRIV_NAMESPACE
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; }
};
#if defined (_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) _STLP_PRIV __Select1st_hint< __x, __y >
#else
# define _STLP_SELECT1ST(__x, __y) _STLP_PRIV _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_MOVE_TO_STD_NAMESPACE
_STLP_END_NAMESPACE
#endif /* _STLP_INTERNAL_FUNCTION_BASE_H */
// Local Variables:
// mode:C++
// End:
|
