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104 lines
3.2 KiB
104 lines
3.2 KiB
// 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_TRANSFORMED_HPP |
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#define BOOST_RANGE_ADAPTOR_TRANSFORMED_HPP |
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#include <boost/range/adaptor/argument_fwd.hpp> |
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#include <boost/range/iterator_range.hpp> |
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#include <boost/iterator/transform_iterator.hpp> |
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#include <boost/utility/result_of.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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template< class F, class R > |
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struct transformed_range : |
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public boost::iterator_range< |
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boost::transform_iterator< F, |
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BOOST_DEDUCED_TYPENAME range_iterator<R>::type |
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> |
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> |
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{ |
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private: |
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typedef boost::iterator_range< |
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boost::transform_iterator< F, |
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BOOST_DEDUCED_TYPENAME range_iterator<R>::type |
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> |
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> |
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base; |
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public: |
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typedef F transform_fn_type; |
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typedef R source_range_type; |
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transformed_range( F f, R& r ) |
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: base( boost::make_transform_iterator( boost::begin(r), f ), |
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boost::make_transform_iterator( boost::end(r), f ) ) |
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{ } |
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}; |
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template< class T > |
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struct transform_holder : holder<T> |
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{ |
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transform_holder( T r ) : holder<T>(r) |
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{ } |
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}; |
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template< class InputRng, class UnaryFunction > |
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inline transformed_range<UnaryFunction,InputRng> |
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operator|( InputRng& r, |
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const transform_holder<UnaryFunction>& f ) |
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{ |
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return transformed_range<UnaryFunction,InputRng>( f.val, r ); |
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} |
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template< class InputRng, class UnaryFunction > |
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inline transformed_range<UnaryFunction, const InputRng> |
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operator|( const InputRng& r, |
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const transform_holder<UnaryFunction>& f ) |
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{ |
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return transformed_range<UnaryFunction, const InputRng>( f.val, r ); |
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} |
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} // 'range_detail' |
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using range_detail::transformed_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::forwarder<range_detail::transform_holder> |
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transformed = |
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range_detail::forwarder<range_detail::transform_holder>(); |
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} |
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template<class UnaryFunction, class InputRange> |
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inline transformed_range<UnaryFunction, InputRange> |
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transform(InputRange& rng, UnaryFunction fn) |
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{ |
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return transformed_range<UnaryFunction, InputRange>(fn, rng); |
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} |
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template<class UnaryFunction, class InputRange> |
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inline transformed_range<UnaryFunction, const InputRange> |
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transform(const InputRange& rng, UnaryFunction fn) |
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{ |
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return transformed_range<UnaryFunction, const InputRange>(fn, rng); |
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} |
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} // 'adaptors' |
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} |
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#endif
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