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#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
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