137 lines
4.6 KiB
C++
137 lines
4.6 KiB
C++
// Boost.Range library
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//
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// Copyright Neil Groves 2007. 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_REPLACED_IF_IMPL_HPP_INCLUDED
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#define BOOST_RANGE_ADAPTOR_REPLACED_IF_IMPL_HPP_INCLUDED
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#include <boost/config.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/range/begin.hpp>
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#include <boost/range/end.hpp>
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#include <boost/range/value_type.hpp>
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#include <boost/iterator/iterator_adaptor.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 Pred, class Value >
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class replace_value_if
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{
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public:
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typedef const Value& result_type;
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typedef const Value& first_argument_type;
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replace_value_if(const Pred& pred, const Value& to)
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: m_pred(pred), m_to(to)
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{
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}
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const Value& operator()(const Value& x) const
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{
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return m_pred(x) ? m_to : x;
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}
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private:
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Pred m_pred;
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Value m_to;
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};
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template< class Pred, class R >
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class replaced_if_range :
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public boost::iterator_range<
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boost::transform_iterator<
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replace_value_if< Pred, BOOST_DEDUCED_TYPENAME range_value<R>::type >,
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BOOST_DEDUCED_TYPENAME range_iterator<R>::type > >
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{
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private:
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typedef replace_value_if< Pred, BOOST_DEDUCED_TYPENAME range_value<R>::type > Fn;
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typedef boost::iterator_range<
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boost::transform_iterator<
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replace_value_if< Pred, BOOST_DEDUCED_TYPENAME range_value<R>::type >,
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BOOST_DEDUCED_TYPENAME range_iterator<R>::type > > base_t;
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public:
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typedef BOOST_DEDUCED_TYPENAME range_value<R>::type value_type;
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replaced_if_range( R& r, const Pred& pred, value_type to )
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: base_t( make_transform_iterator( boost::begin(r), Fn(pred, to) ),
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make_transform_iterator( boost::end(r), Fn(pred, to) ) )
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{ }
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};
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template< class Pred, class T >
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class replace_if_holder
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{
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public:
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replace_if_holder( const Pred& pred, const T& to )
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: m_pred(pred), m_to(to)
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{ }
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const Pred& pred() const { return m_pred; }
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const T& to() const { return m_to; }
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private:
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Pred m_pred;
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T m_to;
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};
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template< class Pred, class InputRng >
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inline replaced_if_range<Pred, InputRng>
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operator|( InputRng& r,
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const replace_if_holder<Pred, BOOST_DEDUCED_TYPENAME range_value<InputRng>::type>& f )
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{
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return replaced_if_range<Pred, InputRng>(r, f.pred(), f.to());
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}
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template< class Pred, class InputRng >
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inline replaced_if_range<Pred, const InputRng>
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operator|( const InputRng& r,
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const replace_if_holder<Pred, BOOST_DEDUCED_TYPENAME range_value<InputRng>::type>& f )
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{
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return replaced_if_range<Pred, const InputRng>(r, f.pred(), f.to());
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}
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} // 'range_detail'
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using range_detail::replaced_if_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::forwarder2TU<range_detail::replace_if_holder>
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replaced_if =
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range_detail::forwarder2TU<range_detail::replace_if_holder>();
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}
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template<class Pred, class InputRange>
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inline replaced_if_range<Pred, InputRange>
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replace_if(InputRange& rng, Pred pred,
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BOOST_DEDUCED_TYPENAME range_value<InputRange>::type to)
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{
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return range_detail::replaced_if_range<Pred, InputRange>(rng, pred, to);
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}
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template<class Pred, class InputRange>
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inline replaced_if_range<Pred, const InputRange>
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replace_if(const InputRange& rng, Pred pred,
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BOOST_DEDUCED_TYPENAME range_value<const InputRange>::type to)
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{
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return range_detail::replaced_if_range<Pred, const InputRange>(rng, pred, to);
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}
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} // 'adaptors'
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} // 'boost'
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#endif // include guard
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