70 lines
2.6 KiB
C
70 lines
2.6 KiB
C
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#ifndef __CXXMPH_HOLLOW_ITERATOR_H__
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#define __CXXMPH_HOLLOW_ITERATOR_H__
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#include <vector>
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namespace cxxmph {
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template <typename container_type, typename presence_type, typename iterator_type>
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struct hollow_iterator_base
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: public std::iterator<std::forward_iterator_tag,
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typename container_type::value_type> {
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typedef presence_type presence;
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typedef container_type container;
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typedef iterator_type iterator;
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typedef hollow_iterator_base<container, presence, iterator>& self_reference;
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typedef typename iterator::reference reference;
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typedef typename iterator::pointer pointer;
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hollow_iterator_base(container* c, presence* p, iterator it)
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: c_(c), p_(p), it_(it) { find_present(); }
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self_reference operator++() {
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++it_; find_present();
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}
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reference operator*() { return *it_; }
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pointer operator->() { return &(*it_); }
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// TODO find syntax to make this less permissible at compile time
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template <class T>
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bool operator==(const T& rhs) { return rhs.it_ == this->it_; }
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template <class T>
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bool operator!=(const T& rhs) { return rhs.it_ != this->it_; }
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public: // TODO find syntax to make this friend of const iterator
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void find_present() {
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while (it_ != c_->end() && !((*p_)[it_-c_->begin()])) ++it_;
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}
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container* c_;
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presence* p_;
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iterator it_;
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};
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template <typename container_type>
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struct hollow_iterator : public hollow_iterator_base<
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container_type, std::vector<bool>, typename container_type::iterator> {
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typedef hollow_iterator_base<
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container_type, std::vector<bool>, typename container_type::iterator> parent_class;
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hollow_iterator(typename parent_class::container* c,
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typename parent_class::presence* p,
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typename parent_class::iterator it)
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: parent_class(c, p, it) { }
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};
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template <typename container_type>
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struct hollow_const_iterator : public hollow_iterator_base<
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const container_type, const std::vector<bool>, typename container_type::const_iterator> {
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typedef hollow_iterator_base<
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const container_type, const std::vector<bool>, typename container_type::const_iterator> parent_class;
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typedef hollow_const_iterator<container_type> self_type;
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typedef hollow_iterator<container_type> non_const_type;
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hollow_const_iterator(non_const_type rhs) : parent_class(rhs.c_, rhs.p_, typename container_type::const_iterator(rhs.it_)) { }
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hollow_const_iterator(const typename parent_class::container* c,
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const typename parent_class::presence* p,
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typename parent_class::iterator it)
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: parent_class(c, p, it) { }
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};
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} // namespace cxxmph
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#endif // __CXXMPH_HOLLOW_ITERATOR_H__
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