#ifndef BOOST_ARCHIVE_ITERATORS_HEAD_ITERATOR_HPP | |
#define BOOST_ARCHIVE_ITERATORS_HEAD_ITERATOR_HPP | |
// MS compatible compilers support #pragma once | |
#if defined(_MSC_VER) && (_MSC_VER >= 1020) | |
# pragma once | |
#endif | |
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 | |
// head_iterator.hpp | |
// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . | |
// Use, modification and distribution is subject to the Boost Software | |
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
// http://www.boost.org/LICENSE_1_0.txt) | |
// See http://www.boost.org for updates, documentation, and revision history. | |
#include <boost/iterator/iterator_adaptor.hpp> | |
#include <boost/iterator/iterator_traits.hpp> | |
namespace boost { | |
namespace archive { | |
namespace iterators { | |
template<class Predicate, class Base> | |
class head_iterator | |
: public boost::iterator_adaptor< | |
head_iterator<Predicate, Base>, | |
Base, | |
use_default, | |
single_pass_traversal_tag | |
> | |
{ | |
private: | |
friend class iterator_core_access; | |
typedef boost::iterator_adaptor< | |
head_iterator<Predicate, Base>, | |
Base, | |
use_default, | |
single_pass_traversal_tag | |
> super_t; | |
typedef head_iterator<Predicate, Base> this_t; | |
typedef BOOST_DEDUCED_TYPENAME super_t::value_type value_type; | |
typedef BOOST_DEDUCED_TYPENAME super_t::reference reference_type; | |
reference_type dereference_impl(){ | |
if(! m_end){ | |
while(! m_predicate(* this->base_reference())) | |
++ this->base_reference(); | |
m_end = true; | |
} | |
return * this->base_reference(); | |
} | |
reference_type dereference() const { | |
return const_cast<this_t *>(this)->dereference_impl(); | |
} | |
void increment(){ | |
++base_reference(); | |
} | |
Predicate m_predicate; | |
bool m_end; | |
public: | |
template<class T> | |
head_iterator(Predicate f, T start) : | |
super_t(Base(start)), | |
m_predicate(f), | |
m_end(false) | |
{} | |
}; | |
} // namespace iterators | |
} // namespace archive | |
} // namespace boost | |
#endif // BOOST_ARCHIVE_ITERATORS_HEAD_ITERATOR_HPP |