91 lines
2.4 KiB
C++
91 lines
2.4 KiB
C++
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// Boost.Range library
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//
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// Copyright Thorsten Ottosen, Neil Groves 2006 - 2008. Use, modification and
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// distribution is subject to the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// For more information, see http://www.boost.org/libs/range/
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//
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#ifndef BOOST_RANGE_ADAPTOR_UNIQUED_IMPL_HPP
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#define BOOST_RANGE_ADAPTOR_UNIQUED_IMPL_HPP
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#include <boost/range/adaptor/adjacent_filtered.hpp>
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namespace boost
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{
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namespace range_detail
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{
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struct unique_forwarder { };
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struct unique_not_equal_to
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{
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typedef bool result_type;
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template< class T >
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bool operator()( const T& l, const T& r ) const
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{
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return !(l == r);
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}
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};
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template<class ForwardRng>
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class unique_range : public adjacent_filter_range<unique_not_equal_to, ForwardRng, true>
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{
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typedef adjacent_filter_range<unique_not_equal_to, ForwardRng, true> base;
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public:
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explicit unique_range(ForwardRng& rng)
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: base(unique_not_equal_to(), rng)
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{
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}
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};
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template< class ForwardRng >
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inline unique_range<ForwardRng>
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operator|( ForwardRng& r,
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unique_forwarder )
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{
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return unique_range<ForwardRng>(r);
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}
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template< class ForwardRng >
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inline unique_range<const ForwardRng>
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operator|( const ForwardRng& r,
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unique_forwarder )
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{
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return unique_range<const ForwardRng>(r);
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}
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} // 'range_detail'
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using range_detail::unique_range;
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namespace adaptors
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{
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namespace
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{
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const range_detail::unique_forwarder uniqued =
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range_detail::unique_forwarder();
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}
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template<class ForwardRange>
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inline unique_range<ForwardRange>
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unique(ForwardRange& rng)
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{
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return unique_range<ForwardRange>(rng);
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}
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template<class ForwardRange>
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inline unique_range<const ForwardRange>
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unique(const ForwardRange& rng)
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{
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return unique_range<const ForwardRange>(rng);
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}
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} // 'adaptors'
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}
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#endif
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