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STLPORT/stlport/stl/_iterator.h

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+/*
+ *
+ * Copyright (c) 1994
+ * Hewlett-Packard Company
+ *
+ * Copyright (c) 1996-1998
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * 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.
+ *
+ */
+
+/* NOTE: This is an internal header file, included by other STL headers.
+ *   You should not attempt to use it directly.
+ */
+
+#ifndef _STLP_INTERNAL_ITERATOR_H
+#define _STLP_INTERNAL_ITERATOR_H
+
+#ifndef _STLP_INTERNAL_ITERATOR_BASE_H
+# include <stl/_iterator_base.h>
+#endif
+
+_STLP_BEGIN_NAMESPACE
+
+#if defined ( _STLP_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 : 
+  public iterator<typename iterator_traits<_Iterator>::iterator_category,
+                  typename iterator_traits<_Iterator>::value_type,
+                  typename iterator_traits<_Iterator>::difference_type,
+                  typename iterator_traits<_Iterator>::pointer,
+                  typename iterator_traits<_Iterator>::reference>
+{
+protected:
+  _Iterator current;
+  typedef reverse_iterator<_Iterator> _Self;
+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;
+public:
+  reverse_iterator() {}
+  explicit reverse_iterator(iterator_type __x) : current(__x) {}
+  reverse_iterator(const _Self& __x) : current(__x.current) {}
+  _Self& operator = (const _Self& __x) { current = __x.base(); return *this; } 
+#ifdef _STLP_MEMBER_TEMPLATES
+  template <class _Iter>
+  reverse_iterator(const reverse_iterator<_Iter>& __x) : current(__x.base()) {}
+  template <class _Iter>
+  _Self& operator = (const reverse_iterator<_Iter>& __x) { current = __x.base(); return *this; } 
+#endif /* _STLP_MEMBER_TEMPLATES */
+    
+  iterator_type base() const { return current; }
+  reference operator*() const {
+    _Iterator __tmp = current;
+    return *--__tmp;
+  }
+  _STLP_DEFINE_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  _STLP_CALL operator==(const reverse_iterator<_Iterator>& __x, 
+                       const reverse_iterator<_Iterator>& __y) {
+  return __x.base() == __y.base();
+}
+
+template <class _Iterator>
+inline bool _STLP_CALL operator<(const reverse_iterator<_Iterator>& __x, 
+                      const reverse_iterator<_Iterator>& __y) {
+  return __y.base() < __x.base();
+}
+
+#ifdef _STLP_USE_SEPARATE_RELOPS_NAMESPACE
+
+template <class _Iterator>
+inline bool _STLP_CALL operator!=(const reverse_iterator<_Iterator>& __x, 
+                       const reverse_iterator<_Iterator>& __y) {
+  return !(__x == __y);
+}
+
+template <class _Iterator>
+inline bool _STLP_CALL operator>(const reverse_iterator<_Iterator>& __x, 
+                      const reverse_iterator<_Iterator>& __y) {
+  return __y < __x;
+}
+
+template <class _Iterator>
+inline bool _STLP_CALL operator<=(const reverse_iterator<_Iterator>& __x, 
+                       const reverse_iterator<_Iterator>& __y) {
+  return !(__y < __x);
+}
+
+template <class _Iterator>
+inline bool _STLP_CALL operator>=(const reverse_iterator<_Iterator>& __x, 
+                      const reverse_iterator<_Iterator>& __y) {
+  return !(__x < __y);
+}
+
+#endif /* _STLP_USE_SEPARATE_RELOPS_NAMESPACE */
+
+template <class _Iterator>
+# ifdef __SUNPRO_CC
+inline ptrdiff_t _STLP_CALL
+# else
+inline typename reverse_iterator<_Iterator>::difference_type _STLP_CALL
+# endif
+operator-(const reverse_iterator<_Iterator>& __x, 
+          const reverse_iterator<_Iterator>& __y) {
+  return __y.base() - __x.base();
+}
+
+template <class _Iterator, class _DifferenceType>
+inline reverse_iterator<_Iterator>  _STLP_CALL
+operator+(_DifferenceType n,const reverse_iterator<_Iterator>& x) {
+  return x.operator+(n);
+}
+
+# endif
+
+template <class _Container>
+class back_insert_iterator 
+  : public iterator<output_iterator_tag,void,void,void,void>
+{
+protected:
+  _Container* container;
+public:
+  typedef _Container          container_type;
+  typedef output_iterator_tag iterator_category;
+
+  explicit back_insert_iterator(_Container& __x) : container(&__x) {}
+  back_insert_iterator<_Container>&
+  operator=(const typename _Container::value_type& __val) { 
+    container->push_back(__val);
+    return *this;
+  }
+  back_insert_iterator<_Container>& operator*() { return *this; }
+  back_insert_iterator<_Container>& operator++() { return *this; }
+  back_insert_iterator<_Container>  operator++(int) { return *this; }
+};
+
+template <class _Container>
+inline back_insert_iterator<_Container>  _STLP_CALL back_inserter(_Container& __x) {
+  return back_insert_iterator<_Container>(__x);
+}
+
+template <class _Container>
+class front_insert_iterator 
+  : public iterator<output_iterator_tag,void,void,void,void>
+{
+protected:
+  _Container* container;
+public:
+  typedef _Container          container_type;
+  typedef output_iterator_tag iterator_category;
+  explicit front_insert_iterator(_Container& __x) : container(&__x) {}
+  front_insert_iterator<_Container>&
+  operator=(const typename _Container::value_type& __val) { 
+    container->push_front(__val);
+    return *this;
+  }
+  front_insert_iterator<_Container>& operator*() { return *this; }
+  front_insert_iterator<_Container>& operator++() { return *this; }
+  front_insert_iterator<_Container>& operator++(int) { return *this; }
+};
+
+template <class _Container>
+inline front_insert_iterator<_Container>  _STLP_CALL front_inserter(_Container& __x) {
+  return front_insert_iterator<_Container>(__x);
+}
+
+template <class _Container>
+class insert_iterator 
+  : public iterator<output_iterator_tag,void,void,void,void>
+{
+protected:
+  _Container* container;
+  typename _Container::iterator iter;
+public:
+  typedef _Container          container_type;
+  typedef output_iterator_tag iterator_category;
+  insert_iterator(_Container& __x, typename _Container::iterator __i) 
+    : container(&__x), iter(__i) {}
+  insert_iterator<_Container>&
+  operator=(const typename _Container::value_type& __val) { 
+    iter = container->insert(iter, __val);
+    ++iter;
+    return *this;
+  }
+  insert_iterator<_Container>& operator*() { return *this; }
+  insert_iterator<_Container>& operator++() { return *this; }
+  insert_iterator<_Container>& operator++(int) { return *this; }
+};
+
+template <class _Container, class _Iterator>
+inline insert_iterator<_Container>  _STLP_CALL
+inserter(_Container& __x, _Iterator __i)
+{
+  typedef typename _Container::iterator __iter;
+  return insert_iterator<_Container>(__x, __iter(__i));
+}
+
+_STLP_END_NAMESPACE
+
+#if ! defined ( _STLP_CLASS_PARTIAL_SPECIALIZATION ) || defined (_STLP_USE_OLD_HP_ITERATOR_QUERIES)
+# include <stl/_iterator_old.h>
+#endif /* __NO_PARTIAL_SPEC || ANACHRONISMS */
+
+#endif /* _STLP_INTERNAL_ITERATOR_H */
+
+// Local Variables:
+// mode:C++
+// End: