138 lines
4.5 KiB
Plaintext
138 lines
4.5 KiB
Plaintext
// 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/detail/default_constructible_unary_fn.hpp>
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#include <boost/range/iterator_range.hpp>
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#include <boost/range/concepts.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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// A type generator to produce the transform_iterator type conditionally
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// including a wrapped predicate as appropriate.
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template<typename P, typename It>
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struct transform_iterator_gen
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{
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typedef transform_iterator<
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typename default_constructible_unary_fn_gen<
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P,
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typename transform_iterator<P, It>::reference
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>::type,
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It
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> type;
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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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typename transform_iterator_gen<
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F, typename range_iterator<R>::type>::type>
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{
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private:
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typedef typename transform_iterator_gen<
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F, typename range_iterator<R>::type>::type transform_iter_t;
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typedef boost::iterator_range<transform_iter_t> base;
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public:
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typedef typename default_constructible_unary_fn_gen<
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F,
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typename transform_iterator<
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F,
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typename range_iterator<R>::type
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>::reference
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>::type transform_fn_type;
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typedef R source_range_type;
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transformed_range(transform_fn_type f, R& r)
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: base(transform_iter_t(boost::begin(r), f),
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transform_iter_t(boost::end(r), f))
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{
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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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};
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template< class SinglePassRange, class UnaryFunction >
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inline transformed_range<UnaryFunction,SinglePassRange>
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operator|( SinglePassRange& r,
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const transform_holder<UnaryFunction>& f )
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{
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BOOST_RANGE_CONCEPT_ASSERT((
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SinglePassRangeConcept<SinglePassRange>));
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return transformed_range<UnaryFunction,SinglePassRange>( f.val, r );
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}
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template< class SinglePassRange, class UnaryFunction >
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inline transformed_range<UnaryFunction, const SinglePassRange>
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operator|( const SinglePassRange& r,
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const transform_holder<UnaryFunction>& f )
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{
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BOOST_RANGE_CONCEPT_ASSERT((
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SinglePassRangeConcept<const SinglePassRange>));
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return transformed_range<UnaryFunction, const SinglePassRange>(
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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 SinglePassRange>
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inline transformed_range<UnaryFunction, SinglePassRange>
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transform(SinglePassRange& rng, UnaryFunction fn)
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{
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BOOST_RANGE_CONCEPT_ASSERT((
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SinglePassRangeConcept<SinglePassRange>));
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return transformed_range<UnaryFunction, SinglePassRange>(fn, rng);
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}
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template<class UnaryFunction, class SinglePassRange>
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inline transformed_range<UnaryFunction, const SinglePassRange>
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transform(const SinglePassRange& rng, UnaryFunction fn)
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{
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BOOST_RANGE_CONCEPT_ASSERT((
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SinglePassRangeConcept<const SinglePassRange>));
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return transformed_range<UnaryFunction, const SinglePassRange>(
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fn, rng);
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}
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} // 'adaptors'
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}
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#endif
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