Chris@16: /*-----------------------------------------------------------------------------+
Chris@16: Copyright (c) 2009-2009: Joachim Faulhaber
Chris@16: +------------------------------------------------------------------------------+
Chris@16:    Distributed under the Boost Software License, Version 1.0.
Chris@16:       (See accompanying file LICENCE.txt or copy at
Chris@16:            http://www.boost.org/LICENSE_1_0.txt)
Chris@16: +-----------------------------------------------------------------------------*/
Chris@16: #ifndef BOOST_ICL_ITERATOR_HPP_JOFA_091003
Chris@16: #define BOOST_ICL_ITERATOR_HPP_JOFA_091003
Chris@16: 
Chris@16: #include <iterator>
Chris@16: #include <boost/config/warning_disable.hpp>
Chris@16: 
Chris@16: namespace boost{namespace icl
Chris@16: {
Chris@16: 
Chris@16: /** \brief Performes an addition using a container's memberfunction add, when operator= is called. */
Chris@16: template<class ContainerT> class add_iterator
Chris@16:     : public std::iterator<std::output_iterator_tag, void, void, void, void>
Chris@16: {
Chris@16: public:
Chris@16:     /// The container's type.
Chris@16:     typedef ContainerT container_type;
Chris@16:     typedef std::output_iterator_tag iterator_category; 
Chris@16: 
Chris@16:     /** An add_iterator is constructed with a container and a position 
Chris@16:         that has to be maintained. */
Chris@16:     add_iterator(ContainerT& cont, typename ContainerT::iterator iter)
Chris@16:     : _cont(&cont), _iter(iter) {}
Chris@16: 
Chris@16:     /** This assignment operator adds the \c value before the current position.
Chris@16:         It maintains it's position by incrementing after addition.    */
Chris@16:     add_iterator& operator=(typename ContainerT::const_reference value)
Chris@16:     {
Chris@16:         _iter = icl::add(*_cont, _iter, value);
Chris@16:         if(_iter != _cont->end())
Chris@16:             ++_iter;
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16:     add_iterator& operator*()    { return *this; }
Chris@16:     add_iterator& operator++()   { return *this; }
Chris@16:     add_iterator& operator++(int){ return *this; }
Chris@16: 
Chris@16: private:
Chris@16:     ContainerT*                   _cont;
Chris@16:     typename ContainerT::iterator _iter;
Chris@16: };
Chris@16: 
Chris@16: 
Chris@16: /** Function adder creates and initializes an add_iterator */
Chris@16: template<class ContainerT, typename IteratorT>
Chris@16: inline add_iterator<ContainerT> adder(ContainerT& cont, IteratorT iter_)
Chris@16: {
Chris@16:     return add_iterator<ContainerT>(cont, typename ContainerT::iterator(iter_));
Chris@16: }
Chris@16: 
Chris@16: /** \brief Performes an insertion using a container's memberfunction add, when operator= is called. */
Chris@16: template<class ContainerT> class insert_iterator
Chris@16:     : public std::iterator<std::output_iterator_tag, void, void, void, void>
Chris@16: {
Chris@16: public:
Chris@16:     /// The container's type.
Chris@16:     typedef ContainerT container_type;
Chris@16:     typedef std::output_iterator_tag iterator_category; 
Chris@16: 
Chris@16:     /** An insert_iterator is constructed with a container and a position 
Chris@16:         that has to be maintained. */
Chris@16:     insert_iterator(ContainerT& cont, typename ContainerT::iterator iter)
Chris@16:     : _cont(&cont), _iter(iter) {}
Chris@16: 
Chris@16:     /** This assignment operator adds the \c value before the current position.
Chris@16:         It maintains it's position by incrementing after addition.    */
Chris@16:     insert_iterator& operator=(typename ContainerT::const_reference value)
Chris@16:     {
Chris@16:         _iter = _cont->insert(_iter, value);
Chris@16:         if(_iter != _cont->end())
Chris@16:             ++_iter;
Chris@16:         return *this;
Chris@16:     }
Chris@16: 
Chris@16:     insert_iterator& operator*()    { return *this; }
Chris@16:     insert_iterator& operator++()   { return *this; }
Chris@16:     insert_iterator& operator++(int){ return *this; }
Chris@16: 
Chris@16: private:
Chris@16:     ContainerT*                   _cont;
Chris@16:     typename ContainerT::iterator _iter;
Chris@16: };
Chris@16: 
Chris@16: 
Chris@16: /** Function inserter creates and initializes an insert_iterator */
Chris@16: template<class ContainerT, typename IteratorT>
Chris@16: inline insert_iterator<ContainerT> inserter(ContainerT& cont, IteratorT iter_)
Chris@16: {
Chris@16:     return insert_iterator<ContainerT>(cont, typename ContainerT::iterator(iter_));
Chris@16: }
Chris@16: 
Chris@16: }} // namespace icl boost
Chris@16: 
Chris@16: #endif // BOOST_ICL_ITERATOR_HPP_JOFA_091003
Chris@16: 
Chris@16: