70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
// include/map_iterators.hh
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// This file is part of libpbe; see http://svn.chezphil.org/libpbe/
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// (C) 2008 Philip Endecott
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#ifndef libpbe_map_iterators_hh
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#define libpbe_map_iterators_hh
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// Provides map_key_iterator and map_value_iterator, which adapt a
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// std::map::iterator to iterate over only the keys or values respectively.
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#include <boost/iterator/transform_iterator.hpp>
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#include <ext/functional>
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namespace pbe {
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template <typename iter_t>
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struct map_key_iterator:
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public boost::transform_iterator< __gnu_cxx::select1st<typename iter_t::value_type>,
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iter_t >
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{
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map_key_iterator() {}
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map_key_iterator(iter_t i):
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boost::transform_iterator< __gnu_cxx::select1st<typename iter_t::value_type>, iter_t >(i)
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{}
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};
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template <typename iter_t>
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static map_key_iterator<iter_t> make_map_key_iterator(const iter_t& i) {
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return map_key_iterator<iter_t>(i);
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}
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template <typename iter_t>
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struct map_value_iterator:
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public boost::transform_iterator< __gnu_cxx::select2nd<typename iter_t::value_type>,
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iter_t >
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{
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map_value_iterator() {}
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map_value_iterator(iter_t i):
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boost::transform_iterator< __gnu_cxx::select2nd<typename iter_t::value_type>, iter_t >(i)
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{}
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};
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template <typename iter_t>
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static map_value_iterator<iter_t> make_map_value_iterator(const iter_t& i) {
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return map_value_iterator<iter_t>(i);
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}
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};
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#endif
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