_iterator.h

A port of the original STL to many platforms.可以配合多种编译器使用,特别是在使用intel编译器时可以很好的优化代码性能.

/*
 *
 * 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.
 *
 */

#ifndef _STLP_DBG_ITERATOR_H
#define _STLP_DBG_ITERATOR_H

#ifndef _STLP_INTERNAL_PAIR_H
#  include <stl/_pair.h>
#endif

#ifndef _STLP_INTERNAL_ALLOC_H
#  include <stl/_alloc.h>
#endif

#define _STLP_DBG_ALLOCATOR_SELECT( _Tp ) _STLP_DEFAULT_ALLOCATOR_SELECT( _Tp )

_STLP_BEGIN_NAMESPACE

_STLP_MOVE_TO_PRIV_NAMESPACE

//============================================================

template <class _Iterator>
void _Decrement(_Iterator& __it, const bidirectional_iterator_tag &)
{ --__it; }

template <class _Iterator>
void _Decrement(_Iterator& __it, const random_access_iterator_tag &)
{ --__it; }

template <class _Iterator>
void _Decrement(_Iterator& __it, const forward_iterator_tag &)
{ _STLP_ASSERT(0) }

template <class _Iterator>
void _Advance(_Iterator&, ptrdiff_t, const forward_iterator_tag &)
{ _STLP_ASSERT(0) }

template <class _Iterator>
void _Advance(_Iterator& __it, ptrdiff_t, const bidirectional_iterator_tag &)
{ _STLP_ASSERT(0) }

template <class _Iterator>
void _Advance(_Iterator& __it, ptrdiff_t __n, const random_access_iterator_tag &)
{ __it += __n; }

template <class _Iterator>
ptrdiff_t _DBG_distance(const _Iterator& __x, const _Iterator& __y, const random_access_iterator_tag &)
{ return __x - __y; }

template <class _Iterator>
ptrdiff_t _DBG_distance(const _Iterator&, const _Iterator&, const forward_iterator_tag &) {
  _STLP_ASSERT(0)
  return 0;
}

template <class _Iterator>
ptrdiff_t _DBG_distance(const _Iterator&, const _Iterator&, const bidirectional_iterator_tag &) {
  _STLP_ASSERT(0)
  return 0;
}

template <class _Iterator>
bool _CompareIt(const _Iterator&, const _Iterator&, const forward_iterator_tag &) {
  _STLP_ASSERT(0)
  return false;
}

template <class _Iterator>
bool _CompareIt(const _Iterator&, const _Iterator&, const bidirectional_iterator_tag &) {
  _STLP_ASSERT(0)
  return false;
}

template <class _Iterator>
bool _CompareIt(const _Iterator& __x, const _Iterator& __y, const random_access_iterator_tag &)
{ return __x < __y; }

template <class _Iterator>
bool _Dereferenceable(const _Iterator& __it)
{ return (__it._Get_container_ptr() != 0) && !(__it._M_iterator == (__it._Get_container_ptr())->end()); }

template <class _Iterator>
bool _Incrementable(const _Iterator& __it, ptrdiff_t __n, const forward_iterator_tag &)
{ return (__n == 1) && _Dereferenceable(__it); }

template <class _Iterator>
bool _Incrementable(const _Iterator& __it, ptrdiff_t __n, const bidirectional_iterator_tag &) {
  typedef typename _Iterator::_Container_type __container_type;
  __container_type* __c = __it._Get_container_ptr();
  return (__c != 0) && ((__n == 1 && __it._M_iterator != __c->end() ) ||
                        (__n == -1 && __it._M_iterator != __c->begin()));
}

template <class _Iterator>
bool _Incrementable(const _Iterator& __it, ptrdiff_t __n, const random_access_iterator_tag &) {
  typedef typename _Iterator::_Container_type __container_type;
  __container_type* __c = __it._Get_container_ptr();
  if (__c == 0) return false;
  ptrdiff_t __new_pos = (__it._M_iterator - __c->begin()) + __n;
  return  (__new_pos >= 0) && (__STATIC_CAST(typename __container_type::size_type, __new_pos) <= __c->size());
}


template <class _Container>
struct _DBG_iter_base : public __owned_link {
public:
  typedef typename _Container::value_type value_type;
  typedef typename _Container::reference  reference;
  typedef typename _Container::pointer    pointer;
  typedef ptrdiff_t difference_type;
  //private:
  typedef typename _Container::iterator        _Nonconst_iterator;
  typedef typename _Container::const_iterator  _Const_iterator;
  typedef _Container                     _Container_type;

#ifdef _STLP_CLASS_PARTIAL_SPECIALIZATION
  typedef typename iterator_traits<_Const_iterator>::iterator_category _Iterator_category;
#else
  typedef typename _Container::_Iterator_category  _Iterator_category;
#endif
  typedef _Iterator_category iterator_category;

  _DBG_iter_base() : __owned_link(0)  {}
  _DBG_iter_base(const __owned_list* __c, const _Const_iterator& __it) :
#if defined(__HP_aCC) && (__HP_aCC < 60000)
  __owned_link(__c), _M_iterator(*__REINTERPRET_CAST(const _Nonconst_iterator *, &__it)) {}
#else
    __owned_link(__c), _M_iterator(*(const _Nonconst_iterator*)&__it) {}
#endif
  _Container* _Get_container_ptr() const {
    return (_Container*)__stl_debugger::_Get_container_ptr(this);
  }

  void __increment();
  void __decrement();
  void __advance(ptrdiff_t __n);

// protected:
  _Nonconst_iterator _M_iterator;
};

template <class _Container>
inline void _DBG_iter_base<_Container>::__increment() {
  _STLP_DEBUG_CHECK(_Incrementable(*this, 1, _Iterator_category()))
  ++_M_iterator;
}

template <class _Container>
inline void _DBG_iter_base<_Container>::__decrement() {
  _STLP_DEBUG_CHECK(_Incrementable(*this, -1, _Iterator_category()))
  _Decrement(_M_iterator, _Iterator_category());
}

template <class _Container>
inline void _DBG_iter_base<_Container>::__advance(ptrdiff_t __n) {
  _STLP_DEBUG_CHECK(_Incrementable(*this, __n, _Iterator_category()))
  _Advance(_M_iterator, __n, _Iterator_category());
}

template <class _Container>
ptrdiff_t operator-(const _DBG_iter_base<_Container>& __x,
                    const _DBG_iter_base<_Container>& __y ) {
  typedef typename _DBG_iter_base<_Container>::_Iterator_category  _Iterator_category;
  _STLP_DEBUG_CHECK(__check_same_owner(__x, __y))
  return _DBG_distance(__x._M_iterator,__y._M_iterator, _Iterator_category());
}

template <class _Container, class _Traits>
struct _DBG_iter_mid : public _DBG_iter_base<_Container> {
  typedef _DBG_iter_mid<_Container, typename _Traits::_NonConstTraits> _Nonconst_self;
  typedef typename _Container::iterator        _Nonconst_iterator;
  typedef typename _Container::const_iterator  _Const_iterator;

  _DBG_iter_mid() {}

  explicit _DBG_iter_mid(const _Nonconst_self& __it) :
      _DBG_iter_base<_Container>(__it) {}

  _DBG_iter_mid(const __owned_list* __c, const _Const_iterator& __it) :
      _DBG_iter_base<_Container>(__c, __it) {}
};

template <class _Container, class _Traits>
struct _DBG_iter : public _DBG_iter_mid<_Container, _Traits> {
  typedef _DBG_iter_base<_Container>          _Base;
public:
  typedef typename _Base::value_type value_type;
  typedef typename _Base::difference_type difference_type;
  typedef typename _Traits::reference  reference;
  typedef typename _Traits::pointer    pointer;

  typedef typename _Base::_Nonconst_iterator _Nonconst_iterator;
  typedef typename _Base::_Const_iterator _Const_iterator;

private:
  typedef _DBG_iter<_Container, _Traits>     _Self;
  typedef _DBG_iter_mid<_Container, typename _Traits::_NonConstTraits> _Nonconst_mid;

public:

#ifdef _STLP_CLASS_PARTIAL_SPECIALIZATION
  typedef typename _Base::iterator_category iterator_category;
#endif
  typedef typename _Base::_Iterator_category  _Iterator_category;

public:
  _DBG_iter() {}
    // boris : real type of iter would be nice
  _DBG_iter(const __owned_list* __c, const _Const_iterator& __it) :
    _DBG_iter_mid<_Container, _Traits>(__c, __it) {}

  // This allows conversions from iterator to const_iterator without being
  // redundant with the copy constructor below.
  _DBG_iter(const _Nonconst_mid& __rhs) :
    _DBG_iter_mid<_Container, _Traits>(__rhs) {}

  _DBG_iter(const  _Self& __rhs) :
    _DBG_iter_mid<_Container, _Traits>(__rhs) {}

  // This allows conversions from iterator to const_iterator without being
  // redundant with the copy assignment operator below.
  _Self& operator=(const _Nonconst_mid& __rhs) {
    (_Base&)*this = __rhs;
    return *this;
  }

  _Self& operator=(const  _Self& __rhs) {
    (_Base&)*this = __rhs;
    return *this;
  }

  reference operator*() const;

  _STLP_DEFINE_ARROW_OPERATOR

  _Self& operator++() {
    this->__increment();
    return *this;
  }
  _Self operator++(int) {
    _Self __tmp = *this;
    this->__increment();
    return __tmp;
  }
  _Self& operator--() {
    this->__decrement();
    return *this;
  }
  _Self operator--(int) {
    _Self __tmp = *this;
    this->__decrement();
    return __tmp;
  }

  _Self& operator+=(difference_type __n) {
    this->__advance(__n);
    return *this;
  }

  _Self& operator-=(difference_type __n) {
    this->__advance(-__n);
    return *this;
  }
  _Self operator+(difference_type __n) const {
    _Self __tmp(*this);
    __tmp.__advance(__n);
    return __tmp;
  }
  _Self operator-(difference_type __n) const {
    _Self __tmp(*this);
    __tmp.__advance(-__n);
    return __tmp;
  }
  reference operator[](difference_type __n) const { return *(*this + __n); }
};

template <class _Container, class _Traits>
inline
#if defined (_STLP_NESTED_TYPE_PARAM_BUG)
_STLP_TYPENAME_ON_RETURN_TYPE _Traits::reference
#else
_STLP_TYPENAME_ON_RETURN_TYPE _DBG_iter<_Container, _Traits>::reference
#endif
_DBG_iter<_Container, _Traits>::operator*() const {
  _STLP_DEBUG_CHECK(_Dereferenceable(*this))
  _STLP_DEBUG_CHECK(_Traits::_Check(*this))
  return *this->_M_iterator;
}

template <class _Container>
inline bool
operator==(const _DBG_iter_base<_Container>& __x, const _DBG_iter_base<_Container>& __y) {
  _STLP_DEBUG_CHECK(__check_same_or_null_owner(__x, __y))
  return __x._M_iterator == __y._M_iterator;
}

template <class _Container>
inline bool
operator<(const _DBG_iter_base<_Container>& __x, const _DBG_iter_base<_Container>& __y) {
  _STLP_DEBUG_CHECK(__check_same_or_null_owner(__x, __y))
  typedef typename _DBG_iter_base<_Container>::_Iterator_category _Category;
  return _CompareIt(__x._M_iterator , __y._M_iterator, _Category());
}

template <class _Container>
inline bool
operator>(const _DBG_iter_base<_Container>& __x,
       const _DBG_iter_base<_Container>& __y) {
  typedef typename _DBG_iter_base<_Container>::_Iterator_category _Category;
  return _CompareIt(__y._M_iterator , __x._M_iterator, _Category());
}

template <class _Container>
inline bool
operator>=(const _DBG_iter_base<_Container>& __x, const _DBG_iter_base<_Container>& __y) {
  _STLP_DEBUG_CHECK(__check_same_or_null_owner(__x, __y))
  typedef typename _DBG_iter_base<_Container>::_Iterator_category _Category;
  return !_CompareIt(__x._M_iterator , __y._M_iterator, _Category());
}

template <class _Container>
inline bool
operator<=(const _DBG_iter_base<_Container>& __x,
       const _DBG_iter_base<_Container>& __y) {
  typedef typename _DBG_iter_base<_Container>::_Iterator_category _Category;
  return !_CompareIt(__y._M_iterator , __x._M_iterator, _Category());
}

template <class _Container>
inline bool
operator!=(const _DBG_iter_base<_Container>& __x,
        const _DBG_iter_base<_Container>& __y) {
  _STLP_DEBUG_CHECK(__check_same_or_null_owner(__x, __y))
  return __x._M_iterator != __y._M_iterator;
}

//------------------------------------------

template <class _Container, class _Traits>
inline _DBG_iter<_Container, _Traits>
operator+(ptrdiff_t __n, const _DBG_iter<_Container, _Traits>& __it) {
  _DBG_iter<_Container, _Traits> __tmp(__it);
  return __tmp += __n;
}


template <class _Iterator>
inline _Iterator _Non_Dbg_iter(_Iterator __it)
{ return __it; }

#if defined (_STLP_FUNCTION_TMPL_PARTIAL_ORDER)
template <class _Container, class _Traits>
inline typename _DBG_iter<_Container, _Traits>::_Nonconst_iterator
_Non_Dbg_iter(_DBG_iter<_Container, _Traits> __it)
{ return __it._M_iterator; }
#endif

/*
 * Helper classes to check iterator range or pointer validity
 * at construction time.
 */
template <class _Container>
class __construct_checker {
  typedef typename _Container::value_type value_type;
protected:
  __construct_checker() {}

  __construct_checker(const value_type* __p) {
    _STLP_VERBOSE_ASSERT((__p != 0), _StlMsg_INVALID_ARGUMENT)
  }

#if defined (_STLP_MEMBER_TEMPLATES)
  template <class _InputIter>
  __construct_checker(const _InputIter& __f, const _InputIter& __l) {
    typedef typename _IsIntegral<_InputIter>::_Ret _Integral;
    _M_check_dispatch(__f, __l, _Integral());
  }

  template <class _Integer>
  void _M_check_dispatch(_Integer , _Integer, const __true_type& /*IsIntegral*/) {}

  template <class _InputIter>
  void _M_check_dispatch(const _InputIter& __f, const _InputIter& __l, const __false_type& /*IsIntegral*/) {
    _STLP_DEBUG_CHECK(__check_range(__f,__l))
  }
#endif

#if !defined (_STLP_MEMBER_TEMPLATES) || !defined (_STLP_NO_METHOD_SPECIALIZATION)
  __construct_checker(const value_type* __f, const value_type* __l) {
    _STLP_DEBUG_CHECK(__check_ptr_range(__f,__l))
  }

  typedef _DBG_iter_base<_Container> _IteType;
  __construct_checker(const _IteType& __f, const _IteType& __l) {
    _STLP_DEBUG_CHECK(__check_range(__f,__l))
  }
#endif
};

#if defined (_STLP_USE_OLD_HP_ITERATOR_QUERIES)
#  if defined (_STLP_NESTED_TYPE_PARAM_BUG) ||\
     (defined (__SUNPRO_CC) && __SUNPRO_CC < 0x600) ||\
     (defined (_STLP_MSVC) && (_STLP_MSVC < 1100))
#    define _STLP_DEBUG_USE_DISTINCT_VALUE_TYPE_HELPERS 1
#  endif

_STLP_MOVE_TO_STD_NAMESPACE

template <class _Container>
inline ptrdiff_t*
distance_type(const _STLP_PRIV _DBG_iter_base<_Container>&) { return (ptrdiff_t*) 0; }

#  if !defined (_STLP_DEBUG_USE_DISTINCT_VALUE_TYPE_HELPERS)
template <class _Container>
inline _STLP_TYPENAME_ON_RETURN_TYPE _STLP_PRIV _DBG_iter_base<_Container>::value_type*
value_type(const _STLP_PRIV _DBG_iter_base<_Container>&) {
  typedef typename _STLP_PRIV _DBG_iter_base<_Container>::value_type _Val;
  return (_Val*)0;
}

template <class _Container>
inline _STLP_TYPENAME_ON_RETURN_TYPE _STLP_PRIV _DBG_iter_base<_Container>::_Iterator_category
iterator_category(const _STLP_PRIV _DBG_iter_base<_Container>&) {
  typedef typename _STLP_PRIV _DBG_iter_base<_Container>::_Iterator_category _Category;
  return _Category();
}
#  endif

_STLP_MOVE_TO_PRIV_NAMESPACE

#endif /* _STLP_USE_OLD_HP_ITERATOR_QUERIES */

_STLP_MOVE_TO_STD_NAMESPACE

_STLP_END_NAMESPACE

#endif /* INTERNAL_H */

// Local Variables:
// mode:C++
// End: