104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
// 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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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 transform_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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transform_range( F f, R& r )
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: base( make_transform_iterator( boost::begin(r), f ),
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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 transform_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 transform_range<UnaryFunction,InputRng>( f.val, r );
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}
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template< class InputRng, class UnaryFunction >
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inline transform_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 transform_range<UnaryFunction, const InputRng>( f.val, r );
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}
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} // 'range_detail'
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using range_detail::transform_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 transform_range<UnaryFunction, InputRange>
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transform(InputRange& rng, UnaryFunction fn)
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{
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return transform_range<UnaryFunction, InputRange>(fn, rng);
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}
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template<class UnaryFunction, class InputRange>
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inline transform_range<UnaryFunction, const InputRange>
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transform(const InputRange& rng, UnaryFunction fn)
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{
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return transform_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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