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gcc/libstdc++/stl/stl_iterator.h
Gabriel Dos Reis f1c9d505f9 stl_iterator.h: Make it possible to use standard class `iterator'. 
2000-01-19  Gabriel Dos Reis  <dosreis@cmla.ens-cachan.fr>

        * stl_iterator.h: Make it possible to use standard class
        `iterator'.

From-SVN: r31584
2000-01-24 11:25:23 +00:00

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/*
*
* Copyright (c) 1994
* Hewlett-Packard Company
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Hewlett-Packard Company makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
*
* Copyright (c) 1996-1998
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*/
/* NOTE: This is an internal header file, included by other STL headers.
* You should not attempt to use it directly.
*/
#ifndef __SGI_STL_INTERNAL_ITERATOR_H
#define __SGI_STL_INTERNAL_ITERATOR_H
__STL_BEGIN_NAMESPACE
struct input_iterator_tag {};
struct output_iterator_tag {};
struct forward_iterator_tag : public input_iterator_tag {};
struct bidirectional_iterator_tag : public forward_iterator_tag {};
struct random_access_iterator_tag : public bidirectional_iterator_tag {};
// The base classes input_iterator, output_iterator, forward_iterator,
// bidirectional_iterator, and random_access_iterator are not part of
// the C++ standard. (they have been replaced by struct iterator.)
// They are included for backward compatibility with the HP STL.
template <class _Tp, class _Distance> struct input_iterator {
typedef input_iterator_tag iterator_category;
typedef _Tp value_type;
typedef _Distance difference_type;
typedef _Tp* pointer;
typedef _Tp& reference;
};
struct output_iterator {
typedef output_iterator_tag iterator_category;
typedef void value_type;
typedef void difference_type;
typedef void pointer;
typedef void reference;
};
template <class _Tp, class _Distance> struct forward_iterator {
typedef forward_iterator_tag iterator_category;
typedef _Tp value_type;
typedef _Distance difference_type;
typedef _Tp* pointer;
typedef _Tp& reference;
};
template <class _Tp, class _Distance> struct bidirectional_iterator {
typedef bidirectional_iterator_tag iterator_category;
typedef _Tp value_type;
typedef _Distance difference_type;
typedef _Tp* pointer;
typedef _Tp& reference;
};
template <class _Tp, class _Distance> struct random_access_iterator {
typedef random_access_iterator_tag iterator_category;
typedef _Tp value_type;
typedef _Distance difference_type;
typedef _Tp* pointer;
typedef _Tp& reference;
};
template <class _Category, class _Tp, class _Distance = ptrdiff_t,
class _Pointer = _Tp*, class _Reference = _Tp&>
struct iterator {
typedef _Category iterator_category;
typedef _Tp value_type;
typedef _Distance difference_type;
typedef _Pointer pointer;
typedef _Reference reference;
};
#ifdef __STL_CLASS_PARTIAL_SPECIALIZATION
template <class _Iterator>
struct iterator_traits {
typedef typename _Iterator::iterator_category iterator_category;
typedef typename _Iterator::value_type value_type;
typedef typename _Iterator::difference_type difference_type;
typedef typename _Iterator::pointer pointer;
typedef typename _Iterator::reference reference;
};
template <class _Tp>
struct iterator_traits<_Tp*> {
typedef random_access_iterator_tag iterator_category;
typedef _Tp value_type;
typedef ptrdiff_t difference_type;
typedef _Tp* pointer;
typedef _Tp& reference;
};
template <class _Tp>
struct iterator_traits<const _Tp*> {
typedef random_access_iterator_tag iterator_category;
typedef _Tp value_type;
typedef ptrdiff_t difference_type;
typedef const _Tp* pointer;
typedef const _Tp& reference;
};
// The overloaded functions iterator_category, distance_type, and
// value_type are not part of the C++ standard. (They have been
// replaced by struct iterator_traits.) They are included for
// backward compatibility with the HP STL.
// We introduce internal names for these functions.
template <class _Iter>
inline typename iterator_traits<_Iter>::iterator_category
__iterator_category(const _Iter&)
{
typedef typename iterator_traits<_Iter>::iterator_category _Category;
return _Category();
}
template <class _Iter>
inline typename iterator_traits<_Iter>::difference_type*
__distance_type(const _Iter&)
{
return static_cast<typename iterator_traits<_Iter>::difference_type*>(0);
}
template <class _Iter>
inline typename iterator_traits<_Iter>::value_type*
__value_type(const _Iter&)
{
return static_cast<typename iterator_traits<_Iter>::value_type*>(0);
}
template <class _Iter>
inline typename iterator_traits<_Iter>::iterator_category
iterator_category(const _Iter& __i) { return __iterator_category(__i); }
template <class _Iter>
inline typename iterator_traits<_Iter>::difference_type*
distance_type(const _Iter& __i) { return __distance_type(__i); }
template <class _Iter>
inline typename iterator_traits<_Iter>::value_type*
value_type(const _Iter& __i) { return __value_type(__i); }
#define __ITERATOR_CATEGORY(__i) __iterator_category(__i)
#define __DISTANCE_TYPE(__i) __distance_type(__i)
#define __VALUE_TYPE(__i) __value_type(__i)
#else /* __STL_CLASS_PARTIAL_SPECIALIZATION */
template <class _Tp, class _Distance>
inline input_iterator_tag
iterator_category(const input_iterator<_Tp, _Distance>&)
{ return input_iterator_tag(); }
inline output_iterator_tag iterator_category(const output_iterator&)
{ return output_iterator_tag(); }
template <class _Tp, class _Distance>
inline forward_iterator_tag
iterator_category(const forward_iterator<_Tp, _Distance>&)
{ return forward_iterator_tag(); }
template <class _Tp, class _Distance>
inline bidirectional_iterator_tag
iterator_category(const bidirectional_iterator<_Tp, _Distance>&)
{ return bidirectional_iterator_tag(); }
template <class _Tp, class _Distance>
inline random_access_iterator_tag
iterator_category(const random_access_iterator<_Tp, _Distance>&)
{ return random_access_iterator_tag(); }
template <class _Tp>
inline random_access_iterator_tag iterator_category(const _Tp*)
{ return random_access_iterator_tag(); }
template <class _Tp, class _Distance>
inline _Tp* value_type(const input_iterator<_Tp, _Distance>&)
{ return (_Tp*)(0); }
template <class _Tp, class _Distance>
inline _Tp* value_type(const forward_iterator<_Tp, _Distance>&)
{ return (_Tp*)(0); }
template <class _Tp, class _Distance>
inline _Tp* value_type(const bidirectional_iterator<_Tp, _Distance>&)
{ return (_Tp*)(0); }
template <class _Tp, class _Distance>
inline _Tp* value_type(const random_access_iterator<_Tp, _Distance>&)
{ return (_Tp*)(0); }
template <class _Tp>
inline _Tp* value_type(const _Tp*) { return (_Tp*)(0); }
template <class _Tp, class _Distance>
inline _Distance* distance_type(const input_iterator<_Tp, _Distance>&)
{
return (_Distance*)(0);
}
template <class _Tp, class _Distance>
inline _Distance* distance_type(const forward_iterator<_Tp, _Distance>&)
{
return (_Distance*)(0);
}
template <class _Tp, class _Distance>
inline _Distance*
distance_type(const bidirectional_iterator<_Tp, _Distance>&)
{
return (_Distance*)(0);
}
template <class _Tp, class _Distance>
inline _Distance*
distance_type(const random_access_iterator<_Tp, _Distance>&)
{
return (_Distance*)(0);
}
template <class _Tp>
inline ptrdiff_t* distance_type(const _Tp*) { return (ptrdiff_t*)(0); }
// Without partial specialization we can't use iterator_traits, so
// we must keep the old iterator query functions around.
#define __ITERATOR_CATEGORY(__i) iterator_category(__i)
#define __DISTANCE_TYPE(__i) distance_type(__i)
#define __VALUE_TYPE(__i) value_type(__i)
#endif /* __STL_CLASS_PARTIAL_SPECIALIZATION */
template <class _InputIterator, class _Distance>
inline void __distance(_InputIterator __first, _InputIterator __last,
_Distance& __n, input_iterator_tag)
{
while (__first != __last) { ++__first; ++__n; }
}
template <class _RandomAccessIterator, class _Distance>
inline void __distance(_RandomAccessIterator __first,
_RandomAccessIterator __last,
_Distance& __n, random_access_iterator_tag)
{
__n += __last - __first;
}
template <class _InputIterator, class _Distance>
inline void distance(_InputIterator __first,
_InputIterator __last, _Distance& __n)
{
__distance(__first, __last, __n, iterator_category(__first));
}
#ifdef __STL_CLASS_PARTIAL_SPECIALIZATION
template <class _InputIterator>
inline typename iterator_traits<_InputIterator>::difference_type
__distance(_InputIterator __first, _InputIterator __last, input_iterator_tag)
{
typename iterator_traits<_InputIterator>::difference_type __n = 0;
while (__first != __last) {
++__first; ++__n;
}
return __n;
}
template <class _RandomAccessIterator>
inline typename iterator_traits<_RandomAccessIterator>::difference_type
__distance(_RandomAccessIterator __first, _RandomAccessIterator __last,
random_access_iterator_tag) {
return __last - __first;
}
template <class _InputIterator>
inline typename iterator_traits<_InputIterator>::difference_type
distance(_InputIterator __first, _InputIterator __last) {
typedef typename iterator_traits<_InputIterator>::iterator_category
_Category;
return __distance(__first, __last, _Category());
}
#endif /* __STL_CLASS_PARTIAL_SPECIALIZATION */
template <class _InputIter, class _Distance>
inline void __advance(_InputIter& __i, _Distance __n, input_iterator_tag) {
while (__n--) ++__i;
}
#if defined(__sgi) && !defined(__GNUC__) && (_MIPS_SIM != _MIPS_SIM_ABI32)
#pragma set woff 1183
#endif
template <class _BidirectionalIterator, class _Distance>
inline void __advance(_BidirectionalIterator& __i, _Distance __n,
bidirectional_iterator_tag) {
if (__n >= 0)
while (__n--) ++__i;
else
while (__n++) --__i;
}
#if defined(__sgi) && !defined(__GNUC__) && (_MIPS_SIM != _MIPS_SIM_ABI32)
#pragma reset woff 1183
#endif
template <class _RandomAccessIterator, class _Distance>
inline void __advance(_RandomAccessIterator& __i, _Distance __n,
random_access_iterator_tag) {
__i += __n;
}
template <class _InputIterator, class _Distance>
inline void advance(_InputIterator& __i, _Distance __n) {
__advance(__i, __n, iterator_category(__i));
}
template <class _Container>
class back_insert_iterator {
protected:
_Container* container;
public:
typedef _Container container_type;
typedef output_iterator_tag iterator_category;
typedef void value_type;
typedef void difference_type;
typedef void pointer;
typedef void reference;
explicit back_insert_iterator(_Container& __x) : container(&__x) {}
back_insert_iterator<_Container>&
operator=(const typename _Container::value_type& __value) {
container->push_back(__value);
return *this;
}
back_insert_iterator<_Container>& operator*() { return *this; }
back_insert_iterator<_Container>& operator++() { return *this; }
back_insert_iterator<_Container>& operator++(int) { return *this; }
};
#ifndef __STL_CLASS_PARTIAL_SPECIALIZATION
template <class _Container>
inline output_iterator_tag
iterator_category(const back_insert_iterator<_Container>&)
{
return output_iterator_tag();
}
#endif /* __STL_CLASS_PARTIAL_SPECIALIZATION */
template <class _Container>
inline back_insert_iterator<_Container> back_inserter(_Container& __x) {
return back_insert_iterator<_Container>(__x);
}
template <class _Container>
class front_insert_iterator {
protected:
_Container* container;
public:
typedef _Container container_type;
typedef output_iterator_tag iterator_category;
typedef void value_type;
typedef void difference_type;
typedef void pointer;
typedef void reference;
explicit front_insert_iterator(_Container& __x) : container(&__x) {}
front_insert_iterator<_Container>&
operator=(const typename _Container::value_type& __value) {
container->push_front(__value);
return *this;
}
front_insert_iterator<_Container>& operator*() { return *this; }
front_insert_iterator<_Container>& operator++() { return *this; }
front_insert_iterator<_Container>& operator++(int) { return *this; }
};
#ifndef __STL_CLASS_PARTIAL_SPECIALIZATION
template <class _Container>
inline output_iterator_tag
iterator_category(const front_insert_iterator<_Container>&)
{
return output_iterator_tag();
}
#endif /* __STL_CLASS_PARTIAL_SPECIALIZATION */
template <class _Container>
inline front_insert_iterator<_Container> front_inserter(_Container& __x) {
return front_insert_iterator<_Container>(__x);
}
template <class _Container>
class insert_iterator {
protected:
_Container* container;
typename _Container::iterator iter;
public:
typedef _Container container_type;
typedef output_iterator_tag iterator_category;
typedef void value_type;
typedef void difference_type;
typedef void pointer;
typedef void reference;
insert_iterator(_Container& __x, typename _Container::iterator __i)
: container(&__x), iter(__i) {}
insert_iterator<_Container>&
operator=(const typename _Container::value_type& __value) {
iter = container->insert(iter, __value);
++iter;
return *this;
}
insert_iterator<_Container>& operator*() { return *this; }
insert_iterator<_Container>& operator++() { return *this; }
insert_iterator<_Container>& operator++(int) { return *this; }
};
#ifndef __STL_CLASS_PARTIAL_SPECIALIZATION
template <class _Container>
inline output_iterator_tag
iterator_category(const insert_iterator<_Container>&)
{
return output_iterator_tag();
}
#endif /* __STL_CLASS_PARTIAL_SPECIALIZATION */
template <class _Container, class _Iterator>
inline
insert_iterator<_Container> inserter(_Container& __x, _Iterator __i)
{
typedef typename _Container::iterator __iter;
return insert_iterator<_Container>(__x, __iter(__i));
}
#ifndef __STL_LIMITED_DEFAULT_TEMPLATES
template <class _BidirectionalIterator, class _Tp, class _Reference = _Tp&,
class _Distance = ptrdiff_t>
#else
template <class _BidirectionalIterator, class _Tp, class _Reference,
class _Distance>
#endif
class reverse_bidirectional_iterator {
typedef reverse_bidirectional_iterator<_BidirectionalIterator, _Tp,
_Reference, _Distance> _Self;
protected:
_BidirectionalIterator current;
public:
typedef bidirectional_iterator_tag iterator_category;
typedef _Tp value_type;
typedef _Distance difference_type;
typedef _Tp* pointer;
typedef _Reference reference;
reverse_bidirectional_iterator() {}
explicit reverse_bidirectional_iterator(_BidirectionalIterator __x)
: current(__x) {}
_BidirectionalIterator base() const { return current; }
_Reference operator*() const {
_BidirectionalIterator __tmp = current;
return *--__tmp;
}
#ifndef __SGI_STL_NO_ARROW_OPERATOR
pointer operator->() const { return &(operator*()); }
#endif /* __SGI_STL_NO_ARROW_OPERATOR */
_Self& operator++() {
--current;
return *this;
}
_Self operator++(int) {
_Self __tmp = *this;
--current;
return __tmp;
}
_Self& operator--() {
++current;
return *this;
}
_Self operator--(int) {
_Self __tmp = *this;
++current;
return __tmp;
}
};
#ifndef __STL_CLASS_PARTIAL_SPECIALIZATION
template <class _BidirectionalIterator, class _Tp, class _Reference,
class _Distance>
inline bidirectional_iterator_tag
iterator_category(const reverse_bidirectional_iterator<_BidirectionalIterator,
_Tp, _Reference,
_Distance>&)
{
return bidirectional_iterator_tag();
}
template <class _BidirectionalIterator, class _Tp, class _Reference,
class _Distance>
inline _Tp*
value_type(const reverse_bidirectional_iterator<_BidirectionalIterator, _Tp,
_Reference, _Distance>&)
{
return (_Tp*) 0;
}
template <class _BidirectionalIterator, class _Tp, class _Reference,
class _Distance>
inline _Distance*
distance_type(const reverse_bidirectional_iterator<_BidirectionalIterator,
_Tp,
_Reference, _Distance>&)
{
return (_Distance*) 0;
}
#endif /* __STL_CLASS_PARTIAL_SPECIALIZATION */
template <class _BiIter, class _Tp, class _Ref,
class _Distance>
inline bool operator==(
const reverse_bidirectional_iterator<_BiIter, _Tp, _Ref, _Distance>& __x,
const reverse_bidirectional_iterator<_BiIter, _Tp, _Ref, _Distance>& __y)
{
return __x.base() == __y.base();
}
#ifdef __STL_CLASS_PARTIAL_SPECIALIZATION
// This is the new version of reverse_iterator, as defined in the
// draft C++ standard. It relies on the iterator_traits template,
// which in turn relies on partial specialization. The class
// reverse_bidirectional_iterator is no longer part of the draft
// standard, but it is retained for backward compatibility.
template <class _Iterator>
class reverse_iterator
{
protected:
_Iterator current;
public:
typedef typename iterator_traits<_Iterator>::iterator_category
iterator_category;
typedef typename iterator_traits<_Iterator>::value_type
value_type;
typedef typename iterator_traits<_Iterator>::difference_type
difference_type;
typedef typename iterator_traits<_Iterator>::pointer
pointer;
typedef typename iterator_traits<_Iterator>::reference
reference;
typedef _Iterator iterator_type;
typedef reverse_iterator<_Iterator> _Self;
public:
reverse_iterator() {}
explicit reverse_iterator(iterator_type __x) : current(__x) {}
reverse_iterator(const _Self& __x) : current(__x.current) {}
#ifdef __STL_MEMBER_TEMPLATES
template <class _Iter>
reverse_iterator(const reverse_iterator<_Iter>& __x)
: current(__x.base()) {}
#endif /* __STL_MEMBER_TEMPLATES */
iterator_type base() const { return current; }
reference operator*() const {
_Iterator __tmp = current;
return *--__tmp;
}
#ifndef __SGI_STL_NO_ARROW_OPERATOR
pointer operator->() const { return &(operator*()); }
#endif /* __SGI_STL_NO_ARROW_OPERATOR */
_Self& operator++() {
--current;
return *this;
}
_Self operator++(int) {
_Self __tmp = *this;
--current;
return __tmp;
}
_Self& operator--() {
++current;
return *this;
}
_Self operator--(int) {
_Self __tmp = *this;
++current;
return __tmp;
}
_Self operator+(difference_type __n) const {
return _Self(current - __n);
}
_Self& operator+=(difference_type __n) {
current -= __n;
return *this;
}
_Self operator-(difference_type __n) const {
return _Self(current + __n);
}
_Self& operator-=(difference_type __n) {
current += __n;
return *this;
}
reference operator[](difference_type __n) const { return *(*this + __n); }
};
template <class _Iterator>
inline bool operator==(const reverse_iterator<_Iterator>& __x,
const reverse_iterator<_Iterator>& __y) {
return __x.base() == __y.base();
}
template <class _Iterator>
inline bool operator<(const reverse_iterator<_Iterator>& __x,
const reverse_iterator<_Iterator>& __y) {
return __y.base() < __x.base();
}
template <class _Iterator>
inline typename reverse_iterator<_Iterator>::difference_type
operator-(const reverse_iterator<_Iterator>& __x,
const reverse_iterator<_Iterator>& __y) {
return __y.base() - __x.base();
}
template <class _Iterator>
inline reverse_iterator<_Iterator>
operator+(typename reverse_iterator<_Iterator>::difference_type __n,
const reverse_iterator<_Iterator>& __x) {
return reverse_iterator<_Iterator>(__x.base() - __n);
}
#else /* __STL_CLASS_PARTIAL_SPECIALIZATION */
// This is the old version of reverse_iterator, as found in the original
// HP STL. It does not use partial specialization.
#ifndef __STL_LIMITED_DEFAULT_TEMPLATES
template <class _RandomAccessIterator, class _Tp, class _Reference = _Tp&,
class _Distance = ptrdiff_t>
#else
template <class _RandomAccessIterator, class _Tp, class _Reference,
class _Distance>
#endif
class reverse_iterator {
typedef reverse_iterator<_RandomAccessIterator, _Tp, _Reference, _Distance>
_Self;
protected:
_RandomAccessIterator current;
public:
typedef random_access_iterator_tag iterator_category;
typedef _Tp value_type;
typedef _Distance difference_type;
typedef _Tp* pointer;
typedef _Reference reference;
reverse_iterator() {}
explicit reverse_iterator(_RandomAccessIterator __x) : current(__x) {}
_RandomAccessIterator base() const { return current; }
_Reference operator*() const { return *(current - 1); }
#ifndef __SGI_STL_NO_ARROW_OPERATOR
pointer operator->() const { return &(operator*()); }
#endif /* __SGI_STL_NO_ARROW_OPERATOR */
_Self& operator++() {
--current;
return *this;
}
_Self operator++(int) {
_Self __tmp = *this;
--current;
return __tmp;
}
_Self& operator--() {
++current;
return *this;
}
_Self operator--(int) {
_Self __tmp = *this;
++current;
return __tmp;
}
_Self operator+(_Distance __n) const {
return _Self(current - __n);
}
_Self& operator+=(_Distance __n) {
current -= __n;
return *this;
}
_Self operator-(_Distance __n) const {
return _Self(current + __n);
}
_Self& operator-=(_Distance __n) {
current += __n;
return *this;
}
_Reference operator[](_Distance __n) const { return *(*this + __n); }
};
template <class _RandomAccessIterator, class _Tp,
class _Reference, class _Distance>
inline random_access_iterator_tag
iterator_category(const reverse_iterator<_RandomAccessIterator, _Tp,
_Reference, _Distance>&)
{
return random_access_iterator_tag();
}
template <class _RandomAccessIterator, class _Tp,
class _Reference, class _Distance>
inline _Tp* value_type(const reverse_iterator<_RandomAccessIterator, _Tp,
_Reference, _Distance>&)
{
return (_Tp*) 0;
}
template <class _RandomAccessIterator, class _Tp,
class _Reference, class _Distance>
inline _Distance*
distance_type(const reverse_iterator<_RandomAccessIterator,
_Tp, _Reference, _Distance>&)
{
return (_Distance*) 0;
}
template <class _RandomAccessIterator, class _Tp,
class _Reference, class _Distance>
inline bool
operator==(const reverse_iterator<_RandomAccessIterator, _Tp,
_Reference, _Distance>& __x,
const reverse_iterator<_RandomAccessIterator, _Tp,
_Reference, _Distance>& __y)
{
return __x.base() == __y.base();
}
template <class _RandomAccessIterator, class _Tp,
class _Reference, class _Distance>
inline bool
operator<(const reverse_iterator<_RandomAccessIterator, _Tp,
_Reference, _Distance>& __x,
const reverse_iterator<_RandomAccessIterator, _Tp,
_Reference, _Distance>& __y)
{
return __y.base() < __x.base();
}
template <class _RandomAccessIterator, class _Tp,
class _Reference, class _Distance>
inline _Distance
operator-(const reverse_iterator<_RandomAccessIterator, _Tp,
_Reference, _Distance>& __x,
const reverse_iterator<_RandomAccessIterator, _Tp,
_Reference, _Distance>& __y)
{
return __y.base() - __x.base();
}
template <class _RandAccIter, class _Tp, class _Ref, class _Dist>
inline reverse_iterator<_RandAccIter, _Tp, _Ref, _Dist>
operator+(_Dist __n,
const reverse_iterator<_RandAccIter, _Tp, _Ref, _Dist>& __x)
{
return reverse_iterator<_RandAccIter, _Tp, _Ref, _Dist>(__x.base() - __n);
}
#endif /* __STL_CLASS_PARTIAL_SPECIALIZATION */
// When we have templatized iostreams, istream_iterator and ostream_iterator
// must be rewritten.
template <class _Tp, class _Dist = ptrdiff_t>
class istream_iterator {
friend bool operator== __STL_NULL_TMPL_ARGS (const istream_iterator&,
const istream_iterator&);
protected:
istream* _M_stream;
_Tp _M_value;
bool _M_end_marker;
void _M_read() {
_M_end_marker = (*_M_stream) ? true : false;
if (_M_end_marker) *_M_stream >> _M_value;
_M_end_marker = (*_M_stream) ? true : false;
}
public:
typedef input_iterator_tag iterator_category;
typedef _Tp value_type;
typedef _Dist difference_type;
typedef const _Tp* pointer;
typedef const _Tp& reference;
istream_iterator() : _M_stream(&cin), _M_end_marker(false) {}
istream_iterator(istream& __s) : _M_stream(&__s) { _M_read(); }
reference operator*() const { return _M_value; }
#ifndef __SGI_STL_NO_ARROW_OPERATOR
pointer operator->() const { return &(operator*()); }
#endif /* __SGI_STL_NO_ARROW_OPERATOR */
istream_iterator<_Tp, _Dist>& operator++() {
_M_read();
return *this;
}
istream_iterator<_Tp, _Dist> operator++(int) {
istream_iterator<_Tp, _Dist> __tmp = *this;
_M_read();
return __tmp;
}
};
#ifndef __STL_CLASS_PARTIAL_SPECIALIZATION
template <class _Tp, class _Dist>
inline input_iterator_tag
iterator_category(const istream_iterator<_Tp, _Dist>&)
{
return input_iterator_tag();
}
template <class _Tp, class _Dist>
inline _Tp*
value_type(const istream_iterator<_Tp, _Dist>&) { return (_Tp*) 0; }
template <class _Tp, class _Dist>
inline _Dist*
distance_type(const istream_iterator<_Tp, _Dist>&) { return (_Dist*)0; }
#endif /* __STL_CLASS_PARTIAL_SPECIALIZATION */
template <class _Tp, class _Distance>
inline bool operator==(const istream_iterator<_Tp, _Distance>& __x,
const istream_iterator<_Tp, _Distance>& __y) {
return (__x._M_stream == __y._M_stream &&
__x._M_end_marker == __y._M_end_marker) ||
__x._M_end_marker == false && __y._M_end_marker == false;
}
template <class _Tp>
class ostream_iterator {
protected:
ostream* _M_stream;
const char* _M_string;
public:
typedef output_iterator_tag iterator_category;
typedef void value_type;
typedef void difference_type;
typedef void pointer;
typedef void reference;
ostream_iterator(ostream& __s) : _M_stream(&__s), _M_string(0) {}
ostream_iterator(ostream& __s, const char* __c)
: _M_stream(&__s), _M_string(__c) {}
ostream_iterator<_Tp>& operator=(const _Tp& __value) {
*_M_stream << __value;
if (_M_string) *_M_stream << _M_string;
return *this;
}
ostream_iterator<_Tp>& operator*() { return *this; }
ostream_iterator<_Tp>& operator++() { return *this; }
ostream_iterator<_Tp>& operator++(int) { return *this; }
};
#ifndef __STL_CLASS_PARTIAL_SPECIALIZATION
template <class _Tp>
inline output_iterator_tag
iterator_category(const ostream_iterator<_Tp>&) {
return output_iterator_tag();
}
#endif /* __STL_CLASS_PARTIAL_SPECIALIZATION */
__STL_END_NAMESPACE
#endif /* __SGI_STL_INTERNAL_ITERATOR_H */
// Local Variables:
// mode:C++
// End:
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