197 lines
5.6 KiB
Plaintext
197 lines
5.6 KiB
Plaintext
// Boost.Range library
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//
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// Copyright Neil Groves 2010. 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_TYPE_ERASED_HPP_INCLUDED
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#define BOOST_RANGE_ADAPTOR_TYPE_ERASED_HPP_INCLUDED
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#include <boost/range/reference.hpp>
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#include <boost/range/value_type.hpp>
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#include <boost/range/iterator_range_core.hpp>
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#include <boost/range/any_range.hpp>
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#include <boost/range/concepts.hpp>
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namespace boost
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{
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namespace adaptors
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{
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template<
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class Value = use_default
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, class Traversal = use_default
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, class Reference = use_default
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, class Difference = use_default
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, class Buffer = use_default
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>
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struct type_erased
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{
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};
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template<
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class SinglePassRange
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, class Value
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, class Traversal
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, class Reference
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, class Difference
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, class Buffer
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>
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typename any_range_type_generator<
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SinglePassRange
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, Value
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, Traversal
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, Reference
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, Difference
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, Buffer
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>::type
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operator|(SinglePassRange& rng,
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type_erased<
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Value
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, Traversal
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, Reference
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, Difference
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, Buffer
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>)
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{
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BOOST_RANGE_CONCEPT_ASSERT((
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SinglePassRangeConcept<SinglePassRange>));
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typedef typename any_range_type_generator<
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SinglePassRange
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, Value
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, Traversal
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, Reference
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, Difference
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, Buffer
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>::type range_type;
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return range_type(boost::begin(rng), boost::end(rng));
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}
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template<
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class SinglePassRange
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, class Value
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, class Traversal
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, class Reference
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, class Difference
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, class Buffer
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>
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typename any_range_type_generator<
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const SinglePassRange
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, Value
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, Traversal
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, Reference
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, Difference
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, Buffer
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>::type
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operator|(const SinglePassRange& rng,
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type_erased<
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Value
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, Traversal
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, Reference
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, Difference
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, Buffer
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>)
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{
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BOOST_RANGE_CONCEPT_ASSERT((
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SinglePassRangeConcept<const SinglePassRange>));
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typedef typename any_range_type_generator<
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const SinglePassRange
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, Value
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, Traversal
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, Reference
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, Difference
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, Buffer
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>::type range_type;
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return range_type(boost::begin(rng), boost::end(rng));
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}
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template<
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class SinglePassRange
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, class Value
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, class Traversal
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, class Reference
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, class Difference
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, class Buffer
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>
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typename any_range_type_generator<
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SinglePassRange
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, Value
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, Traversal
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, Reference
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, Difference
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, Buffer
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>::type
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type_erase(SinglePassRange& rng
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, type_erased<
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Value
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, Traversal
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, Reference
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, Difference
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, Buffer
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> = type_erased<>()
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)
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{
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BOOST_RANGE_CONCEPT_ASSERT((
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SinglePassRangeConcept<SinglePassRange>));
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typedef typename any_range_type_generator<
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SinglePassRange
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, Value
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, Traversal
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, Reference
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, Difference
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, Buffer
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>::type range_type;
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return range_type(boost::begin(rng), boost::end(rng));
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}
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template<
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class SinglePassRange
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, class Value
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, class Traversal
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, class Reference
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, class Difference
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, class Buffer
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>
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typename any_range_type_generator<
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const SinglePassRange
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, Value
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, Traversal
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, Reference
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, Difference
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, Buffer
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>::type
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type_erase(const SinglePassRange& rng
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, type_erased<
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Value
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, Traversal
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, Reference
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, Difference
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, Buffer
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> = type_erased<>()
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)
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{
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BOOST_RANGE_CONCEPT_ASSERT((
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SinglePassRangeConcept<const SinglePassRange>));
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typedef typename any_range_type_generator<
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const SinglePassRange
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, Value
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, Traversal
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, Reference
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, Difference
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, Buffer
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>::type range_type;
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return range_type(boost::begin(rng), boost::end(rng));
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}
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}
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} // namespace boost
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#endif // include guard
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