mirror of
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218 lines
6.5 KiB
C++
218 lines
6.5 KiB
C++
/*
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*
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* Copyright (c) 1994
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* Hewlett-Packard Company
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*
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* Copyright (c) 1996-1998
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* Silicon Graphics Computer Systems, Inc.
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*
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* Copyright (c) 1997
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* Moscow Center for SPARC Technology
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*
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* Copyright (c) 1999
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* Boris Fomitchev
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*
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* This material is provided "as is", with absolutely no warranty expressed
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* or implied. Any use is at your own risk.
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*
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* Permission to use or copy this software for any purpose is hereby granted
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* without fee, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*
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*/
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/* NOTE: This is an internal header file, included by other STL headers.
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* You should not attempt to use it directly.
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*/
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#ifndef _STLP_INTERNAL_FUNCTION_BASE_H
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#define _STLP_INTERNAL_FUNCTION_BASE_H
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#if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION) && !defined (_STLP_TYPE_TRAITS_H)
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# include <stl/type_traits.h>
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#endif
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_STLP_BEGIN_NAMESPACE
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template <class _Arg, class _Result>
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struct unary_function {
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typedef _Arg argument_type;
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typedef _Result result_type;
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#if !defined (__BORLANDC__) || (__BORLANDC__ < 0x580)
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protected:
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/* This class purpose is to be derived but it is not polymorphic so users should never try
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* to destroy an instance of it directly. The protected non-virtual destructor make this
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* fact obvious at compilation time. */
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~unary_function() {}
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#endif
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};
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template <class _Arg1, class _Arg2, class _Result>
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struct binary_function {
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typedef _Arg1 first_argument_type;
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typedef _Arg2 second_argument_type;
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typedef _Result result_type;
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#if !defined (__BORLANDC__) || (__BORLANDC__ < 0x580)
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protected:
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/* See unary_function comment. */
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~binary_function() {}
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#endif
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};
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template <class _Tp>
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struct equal_to : public binary_function<_Tp, _Tp, bool> {
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bool operator()(const _Tp& __x, const _Tp& __y) const { return __x == __y; }
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};
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template <class _Tp>
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struct less : public binary_function<_Tp,_Tp,bool>
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#if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION)
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/* less is the default template parameter for many STL containers, to fully use
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* the move constructor feature we need to know that the default less is just a
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* functor.
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*/
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, public __stlport_class<less<_Tp> >
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#endif
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{
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bool operator()(const _Tp& __x, const _Tp& __y) const { return __x < __y; }
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#if defined (_STLP_USE_PARTIAL_SPEC_WORKAROUND) && !defined (_STLP_FUNCTION_TMPL_PARTIAL_ORDER)
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void _M_swap_workaround(less<_Tp>& __x) {}
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#endif
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};
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#if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION)
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template <class _Tp>
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struct __type_traits<less<_Tp> > {
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#if !defined (__BORLANDC__)
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typedef typename _IsSTLportClass<less<_Tp> >::_Ret _STLportLess;
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#else
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enum { _Is = _IsSTLportClass<less<_Tp> >::_Is };
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typedef typename __bool2type<_Is>::_Ret _STLportLess;
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#endif
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typedef _STLportLess has_trivial_default_constructor;
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typedef _STLportLess has_trivial_copy_constructor;
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typedef _STLportLess has_trivial_assignment_operator;
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typedef _STLportLess has_trivial_destructor;
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typedef _STLportLess is_POD_type;
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};
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#endif
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_STLP_MOVE_TO_PRIV_NAMESPACE
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template <class _Tp>
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less<_Tp> __less(_Tp* ) { return less<_Tp>(); }
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template <class _Tp>
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equal_to<_Tp> __equal_to(_Tp* ) { return equal_to<_Tp>(); }
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_STLP_MOVE_TO_STD_NAMESPACE
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template <class _Tp>
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struct plus : public binary_function<_Tp, _Tp, _Tp> {
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_Tp operator()(const _Tp& __x, const _Tp& __y) const { return __x + __y; }
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};
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template <class _Tp>
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struct minus : public binary_function<_Tp, _Tp, _Tp> {
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_Tp operator()(const _Tp& __x, const _Tp& __y) const { return __x - __y; }
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};
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_STLP_MOVE_TO_PRIV_NAMESPACE
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template <class _Tp>
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plus<_Tp> __plus(_Tp* ) { return plus<_Tp>(); }
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template <class _Tp>
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minus<_Tp> __minus(_Tp* ) { return minus<_Tp>(); }
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_STLP_MOVE_TO_STD_NAMESPACE
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template <class _Tp>
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struct multiplies : public binary_function<_Tp, _Tp, _Tp> {
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_Tp operator()(const _Tp& __x, const _Tp& __y) const { return __x * __y; }
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};
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_STLP_MOVE_TO_PRIV_NAMESPACE
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template <class _Pair>
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struct _Select1st : public unary_function<_Pair, typename _Pair::first_type> {
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const typename _Pair::first_type& operator()(const _Pair& __x) const {
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return __x.first;
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}
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};
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template <class _Pair>
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struct _Select2nd : public unary_function<_Pair, typename _Pair::second_type> {
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const typename _Pair::second_type& operator()(const _Pair& __x) const {
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return __x.second;
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}
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};
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// project1st and project2nd are extensions: they are not part of the standard
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template <class _Arg1, class _Arg2>
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struct _Project1st : public binary_function<_Arg1, _Arg2, _Arg1> {
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_Arg1 operator()(const _Arg1& __x, const _Arg2&) const { return __x; }
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};
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template <class _Arg1, class _Arg2>
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struct _Project2nd : public binary_function<_Arg1, _Arg2, _Arg2> {
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_Arg2 operator()(const _Arg1&, const _Arg2& __y) const { return __y; }
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};
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#if defined (_STLP_MULTI_CONST_TEMPLATE_ARG_BUG)
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// fbp : sort of select1st just for maps
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template <class _Pair, class _Whatever>
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// JDJ (CW Pro1 doesn't like const when first_type is also const)
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struct __Select1st_hint : public unary_function<_Pair, _Whatever> {
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const _Whatever& operator () (const _Pair& __x) const { return __x.first; }
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};
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# define _STLP_SELECT1ST(__x,__y) _STLP_PRIV __Select1st_hint< __x, __y >
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#else
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# define _STLP_SELECT1ST(__x, __y) _STLP_PRIV _Select1st< __x >
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#endif
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template <class _Tp>
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struct _Identity : public unary_function<_Tp,_Tp> {
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const _Tp& operator()(const _Tp& __x) const { return __x; }
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};
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template <class _Result, class _Argument>
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struct _Constant_unary_fun {
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typedef _Argument argument_type;
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typedef _Result result_type;
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result_type _M_val;
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_Constant_unary_fun(const result_type& __v) : _M_val(__v) {}
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const result_type& operator()(const _Argument&) const { return _M_val; }
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};
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template <class _Result, class _Arg1, class _Arg2>
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struct _Constant_binary_fun {
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typedef _Arg1 first_argument_type;
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typedef _Arg2 second_argument_type;
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typedef _Result result_type;
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_Result _M_val;
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_Constant_binary_fun(const _Result& __v) : _M_val(__v) {}
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const result_type& operator()(const _Arg1&, const _Arg2&) const {
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return _M_val;
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}
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};
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// identity_element (not part of the C++ standard).
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template <class _Tp> inline _Tp __identity_element(plus<_Tp>) { return _Tp(0); }
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template <class _Tp> inline _Tp __identity_element(multiplies<_Tp>) { return _Tp(1); }
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_STLP_MOVE_TO_STD_NAMESPACE
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_STLP_END_NAMESPACE
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#endif /* _STLP_INTERNAL_FUNCTION_BASE_H */
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// Local Variables:
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// mode:C++
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// End:
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