生命与死亡都是可以搬运的。

看清事情的全貌，往往需要更高的维度。 // 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 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 inline _Iter_comp_iter<_Compare> __iter_comp_iter(_Compare __comp) { return _Iter_comp_iter<_Compare>(__comp); }

template 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 inline _Iter_comp_val<_Compare> __iter_comp_val(_Compare __comp) { return _Iter_comp_val<_Compare>(__comp); }

template inline _Iter_comp_val<_Compare> __iter_comp_val(_Iter_comp_iter<_Compare> __comp) { return _Iter_comp_val<_Compare>(__comp._M_comp); }

template 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 inline _Val_comp_iter<_Compare> __val_comp_iter(_Compare __comp) { return _Val_comp_iter<_Compare>(__comp); }

template inline _Val_comp_iter<_Compare> __val_comp_iter(_Iter_comp_iter<_Compare> __comp) { return _Val_comp_iter<_Compare>(__comp._M_comp); }

template 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 inline _Iter_equals_val<_Value> __iter_equals_val(_Value& __val) { return _Iter_equals_val<_Value>(__val); }

template 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 inline _Iter_equals_iter<_Iterator> __iter_comp_iter(_Iter_equal_to_iter, _Iterator __it) { return _Iter_equals_iter<_Iterator>(__it); }

template 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 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 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 inline _Iter_negate<_Predicate> __negate(_Iter_pred<_Predicate> __pred) { return _Iter_negate<_Predicate>(__pred._M_pred); }

} // namespace __ops } // namespace __gnu_cxx

#endif