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134 lines
4.2 KiB
134 lines
4.2 KiB
// 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_IMPL_HPP_INCLUDED |
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#define BOOST_RANGE_ADAPTOR_REPLACED_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 Value > |
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class replace_value |
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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(const Value& from, const Value& to) |
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: m_from(from), 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 (x == m_from) ? m_to : x; |
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} |
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private: |
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Value m_from; |
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Value m_to; |
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}; |
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template< class R > |
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class replaced_range : |
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public boost::iterator_range< |
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boost::transform_iterator< |
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replace_value< 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< 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< 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_range( R& r, value_type from, value_type to ) |
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: base_t( make_transform_iterator( boost::begin(r), Fn(from, to) ), |
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make_transform_iterator( boost::end(r), Fn(from, to) ) ) |
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{ } |
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}; |
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template< class T > |
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class replace_holder : public holder2<T> |
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{ |
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public: |
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replace_holder( const T& from, const T& to ) |
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: holder2<T>(from, to) |
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{ } |
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private: |
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// not assignable |
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void operator=(const replace_holder&); |
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}; |
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template< class InputRng > |
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inline replaced_range<InputRng> |
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operator|( InputRng& r, |
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const replace_holder<BOOST_DEDUCED_TYPENAME range_value<InputRng>::type>& f ) |
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{ |
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return replaced_range<InputRng>(r, f.val1, f.val2); |
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} |
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template< class InputRng > |
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inline replaced_range<const InputRng> |
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operator|( const InputRng& r, |
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const replace_holder<BOOST_DEDUCED_TYPENAME range_value<InputRng>::type>& f ) |
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{ |
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return replaced_range<const InputRng>(r, f.val1, f.val2); |
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} |
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} // 'range_detail' |
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using range_detail::replaced_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::forwarder2<range_detail::replace_holder> |
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replaced = |
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range_detail::forwarder2<range_detail::replace_holder>(); |
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} |
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template<class InputRange> |
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inline replaced_range<InputRange> |
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replace(InputRange& rng, |
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BOOST_DEDUCED_TYPENAME range_value<InputRange>::type from, |
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BOOST_DEDUCED_TYPENAME range_value<InputRange>::type to) |
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{ |
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return replaced_range<InputRange>(rng, from, to); |
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} |
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template<class InputRange> |
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inline replaced_range<const InputRange> |
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replace(const InputRange& rng, |
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BOOST_DEDUCED_TYPENAME range_value<const InputRange>::type from, |
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BOOST_DEDUCED_TYPENAME range_value<const InputRange>::type to) |
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{ |
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return replaced_range<const InputRange>(rng, from ,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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