63e88f80
 Hu Chunming
提交三方库
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/*-----------------------------------------------------------------------------+
Copyright (c) 2009-2009: Joachim Faulhaber
+------------------------------------------------------------------------------+
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENCE.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
+-----------------------------------------------------------------------------*/
#ifndef BOOST_ICL_ITERATOR_HPP_JOFA_091003
#define BOOST_ICL_ITERATOR_HPP_JOFA_091003
#include <iterator>
#include <boost/config/warning_disable.hpp>
namespace boost{namespace icl
{
/** \brief Performes an addition using a container's memberfunction add, when operator= is called. */
template<class ContainerT> class add_iterator
{
public:
/// The container's type.
typedef ContainerT container_type;
typedef std::output_iterator_tag iterator_category;
typedef void value_type;
typedef void difference_type;
typedef void pointer;
typedef void reference;
/** An add_iterator is constructed with a container and a position
that has to be maintained. */
add_iterator(ContainerT& cont, typename ContainerT::iterator iter)
: _cont(&cont), _iter(iter) {}
/** This assignment operator adds the \c value before the current position.
It maintains it's position by incrementing after addition. */
add_iterator& operator=(typename ContainerT::const_reference value)
{
_iter = icl::add(*_cont, _iter, value);
if(_iter != _cont->end())
++_iter;
return *this;
}
add_iterator& operator*() { return *this; }
add_iterator& operator++() { return *this; }
add_iterator& operator++(int){ return *this; }
private:
ContainerT* _cont;
typename ContainerT::iterator _iter;
};
/** Function adder creates and initializes an add_iterator */
template<class ContainerT, typename IteratorT>
inline add_iterator<ContainerT> adder(ContainerT& cont, IteratorT iter_)
{
return add_iterator<ContainerT>(cont, typename ContainerT::iterator(iter_));
}
/** \brief Performes an insertion using a container's memberfunction add, when operator= is called. */
template<class ContainerT> class insert_iterator
{
public:
/// The container's type.
typedef ContainerT container_type;
typedef std::output_iterator_tag iterator_category;
typedef void value_type;
typedef void difference_type;
typedef void pointer;
typedef void reference;
/** An insert_iterator is constructed with a container and a position
that has to be maintained. */
insert_iterator(ContainerT& cont, typename ContainerT::iterator iter)
: _cont(&cont), _iter(iter) {}
/** This assignment operator adds the \c value before the current position.
It maintains it's position by incrementing after addition. */
insert_iterator& operator=(typename ContainerT::const_reference value)
{
_iter = _cont->insert(_iter, value);
if(_iter != _cont->end())
++_iter;
return *this;
}
insert_iterator& operator*() { return *this; }
insert_iterator& operator++() { return *this; }
insert_iterator& operator++(int){ return *this; }
private:
ContainerT* _cont;
typename ContainerT::iterator _iter;
};
/** Function inserter creates and initializes an insert_iterator */
template<class ContainerT, typename IteratorT>
inline insert_iterator<ContainerT> inserter(ContainerT& cont, IteratorT iter_)
{
return insert_iterator<ContainerT>(cont, typename ContainerT::iterator(iter_));
}
}} // namespace icl boost
#endif // BOOST_ICL_ITERATOR_HPP_JOFA_091003
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