有没有大佬解释一下这是什么？
2024-07-24 20:29:00
发布于：浙江
// Default predicates for internal use -- C++ --
// Copyright (C) 2013-2014 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, 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 General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// http://www.gnu.org/licenses/.
/** @file predefined_ops.h
- This is an internal header file, included by other library headers.
- You should not attempt to use it directly.
*/
#ifndef _GLIBCXX_PREDEFINED_OPS_H
#define _GLIBCXX_PREDEFINED_OPS_H 1
namespace __gnu_cxx
{
namespace __ops
{
struct _Iter_less_iter
{
template<typename _Iterator1, typename _Iterator2>
bool
operator()(_Iterator1 __it1, _Iterator2 __it2) const
{ return *__it1 < *__it2; }
};
inline _Iter_less_iter
__iter_less_iter()
{ return _Iter_less_iter(); }
struct _Iter_less_val
{
template<typename _Iterator, typename _Value>
bool
operator()(_Iterator __it, _Value& __val) const
{ return *__it < __val; }
};
inline _Iter_less_val
__iter_less_val()
{ return _Iter_less_val(); }
inline _Iter_less_val
__iter_comp_val(_Iter_less_iter)
{ return _Iter_less_val(); }
struct _Val_less_iter
{
template<typename _Value, typename _Iterator>
bool
operator()(_Value& __val, _Iterator __it) const
{ return __val < *__it; }
};
inline _Val_less_iter
__val_less_iter()
{ return _Val_less_iter(); }
inline _Val_less_iter
__val_comp_iter(_Iter_less_iter)
{ return _Val_less_iter(); }
struct _Iter_equal_to_iter
{
template<typename _Iterator1, typename _Iterator2>
bool
operator()(_Iterator1 __it1, _Iterator2 __it2) const
{ return *__it1 == *__it2; }
};
inline _Iter_equal_to_iter
__iter_equal_to_iter()
{ return _Iter_equal_to_iter(); }
struct _Iter_equal_to_val
{
template<typename _Iterator, typename _Value>
bool
operator()(_Iterator __it, _Value& __val) const
{ return *__it == __val; }
};
inline _Iter_equal_to_val
__iter_equal_to_val()
{ return _Iter_equal_to_val(); }
inline _Iter_equal_to_val
__iter_comp_val(_Iter_equal_to_iter)
{ return _Iter_equal_to_val(); }
template<typename _Compare>
struct _Iter_comp_iter
{
_Compare _M_comp;
_Iter_comp_iter(_Compare __comp)
: _M_comp(__comp)
{ }
template<typename _Iterator1, typename _Iterator2>
bool
operator()(_Iterator1 __it1, _Iterator2 __it2)
{ return bool(_M_comp(*__it1, *__it2)); }
};
template<typename _Compare>
inline _Iter_comp_iter<_Compare>
__iter_comp_iter(_Compare __comp)
{ return _Iter_comp_iter<_Compare>(__comp); }
template<typename _Compare>
struct _Iter_comp_val
{
_Compare _M_comp;
_Iter_comp_val(_Compare __comp)
: _M_comp(__comp)
{ }
template<typename _Iterator, typename _Value>
bool
operator()(_Iterator __it, _Value& __val)
{ return bool(_M_comp(*__it, __val)); }
};
template<typename _Compare>
inline _Iter_comp_val<_Compare>
__iter_comp_val(_Compare __comp)
{ return _Iter_comp_val<_Compare>(__comp); }
template<typename _Compare>
inline _Iter_comp_val<_Compare>
__iter_comp_val(_Iter_comp_iter<_Compare> __comp)
{ return _Iter_comp_val<_Compare>(__comp._M_comp); }
template<typename _Compare>
struct _Val_comp_iter
{
_Compare _M_comp;
_Val_comp_iter(_Compare __comp)
: _M_comp(__comp)
{ }
template<typename _Value, typename _Iterator>
bool
operator()(_Value& __val, _Iterator __it)
{ return bool(_M_comp(__val, *__it)); }
};
template<typename _Compare>
inline _Val_comp_iter<_Compare>
__val_comp_iter(_Compare __comp)
{ return _Val_comp_iter<_Compare>(__comp); }
template<typename _Compare>
inline _Val_comp_iter<_Compare>
__val_comp_iter(_Iter_comp_iter<_Compare> __comp)
{ return _Val_comp_iter<_Compare>(__comp._M_comp); }
template<typename _Value>
struct _Iter_equals_val
{
_Value& _M_value;
_Iter_equals_val(_Value& __value)
: _M_value(__value)
{ }
template<typename _Iterator>
bool
operator()(_Iterator __it)
{ return *__it == _M_value; }
};
template<typename _Value>
inline _Iter_equals_val<_Value>
__iter_equals_val(_Value& __val)
{ return _Iter_equals_val<_Value>(__val); }
template<typename _Iterator1>
struct _Iter_equals_iter
{
typename std::iterator_traits<_Iterator1>::reference _M_ref;
_Iter_equals_iter(_Iterator1 __it1)
: _M_ref(*__it1)
{ }
template<typename _Iterator2>
bool
operator()(_Iterator2 __it2)
{ return *__it2 == _M_ref; }
};
template<typename _Iterator>
inline _Iter_equals_iter<_Iterator>
__iter_comp_iter(_Iter_equal_to_iter, _Iterator __it)
{ return _Iter_equals_iter<_Iterator>(__it); }
template<typename _Predicate>
struct _Iter_pred
{
_Predicate _M_pred;
_Iter_pred(_Predicate __pred)
: _M_pred(__pred)
{ }
template<typename _Iterator>
bool
operator()(_Iterator __it)
{ return bool(_M_pred(*__it)); }
};
template<typename _Predicate>
inline _Iter_pred<_Predicate>
__pred_iter(_Predicate __pred)
{ return _Iter_pred<_Predicate>(__pred); }
template<typename _Compare, typename _Value>
struct _Iter_comp_to_val
{
_Compare _M_comp;
_Value& _M_value;
_Iter_comp_to_val(_Compare __comp, _Value& __value)
: _M_comp(__comp), _M_value(__value)
{ }
template<typename _Iterator>
bool
operator()(_Iterator __it)
{ return bool(_M_comp(*__it, _M_value)); }
};
template<typename _Compare, typename _Value>
_Iter_comp_to_val<_Compare, _Value>
__iter_comp_val(_Compare __comp, _Value &__val)
{ return _Iter_comp_to_val<_Compare, _Value>(__comp, __val); }
template<typename _Compare, typename _Iterator1>
struct _Iter_comp_to_iter
{
_Compare _M_comp;
typename std::iterator_traits<_Iterator1>::reference _M_ref;
_Iter_comp_to_iter(_Compare __comp, _Iterator1 __it1)
: _M_comp(__comp), _M_ref(*__it1)
{ }
template<typename _Iterator2>
bool
operator()(_Iterator2 __it2)
{ return bool(_M_comp(*__it2, _M_ref)); }
};
template<typename _Compare, typename _Iterator>
inline _Iter_comp_to_iter<_Compare, _Iterator>
__iter_comp_iter(_Iter_comp_iter<_Compare> __comp, _Iterator __it)
{ return _Iter_comp_to_iter<_Compare, _Iterator>(__comp._M_comp, __it); }
template<typename _Predicate>
struct _Iter_negate
{
_Predicate _M_pred;
_Iter_negate(_Predicate __pred)
: _M_pred(__pred)
{ }
template<typename _Iterator>
bool
operator()(_Iterator __it)
{ return !bool(_M_pred(*__it)); }
};
template<typename _Predicate>
inline _Iter_negate<_Predicate>
__negate(_Iter_pred<_Predicate> __pred)
{ return _Iter_negate<_Predicate>(__pred._M_pred); }
} // namespace __ops
} // namespace __gnu_cxx
#endif
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