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// Boost.Range library
//
// Copyright Neil Groves 2010. Use, modification and
// distribution is subject to the Boost Software License, Version
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// For more information, see http://www.boost.org/libs/range/
//
#ifndef BOOST_RANGE_ADAPTOR_TYPE_ERASED_HPP_INCLUDED
#define BOOST_RANGE_ADAPTOR_TYPE_ERASED_HPP_INCLUDED
#include <boost/range/reference.hpp>
#include <boost/range/value_type.hpp>
#include <boost/range/iterator_range_core.hpp>
#include <boost/range/any_range.hpp>
#include <boost/cast.hpp>
namespace boost
{
namespace adaptors
{
template<
class Value = use_default
, class Traversal = use_default
, class Reference = use_default
, class Difference = use_default
, class Buffer = use_default
>
struct type_erased
{
};
template<
class SinglePassRange
, class Value
, class Traversal
, class Reference
, class Difference
, class Buffer
>
typename any_range_type_generator<
SinglePassRange
, Value
, Traversal
, Reference
, Difference
, Buffer
>::type
operator|(SinglePassRange& rng,
type_erased<
Value
, Traversal
, Reference
, Difference
, Buffer
>)
{
typedef typename any_range_type_generator<
SinglePassRange
, Value
, Traversal
, Reference
, Difference
, Buffer
>::type range_type;
return range_type(boost::begin(rng), boost::end(rng));
}
template<
class SinglePassRange
, class Value
, class Traversal
, class Reference
, class Difference
, class Buffer
>
typename any_range_type_generator<
const SinglePassRange
, Value
, Traversal
, Reference
, Difference
, Buffer
>::type
operator|(const SinglePassRange& rng,
type_erased<
Value
, Traversal
, Reference
, Difference
, Buffer
>)
{
typedef typename any_range_type_generator<
const SinglePassRange
, Value
, Traversal
, Reference
, Difference
, Buffer
>::type range_type;
return range_type(boost::begin(rng), boost::end(rng));
}
template<
class SinglePassRange
, class Value
, class Traversal
, class Reference
, class Difference
, class Buffer
>
typename any_range_type_generator<
SinglePassRange
, Value
, Traversal
, Reference
, Difference
, Buffer
>::type
type_erase(SinglePassRange& rng
, type_erased<
Value
, Traversal
, Reference
, Difference
, Buffer
> = type_erased<>()
)
{
typedef typename any_range_type_generator<
SinglePassRange
, Value
, Traversal
, Reference
, Difference
, Buffer
>::type range_type;
return range_type(boost::begin(rng), boost::end(rng));
}
template<
class SinglePassRange
, class Value
, class Traversal
, class Reference
, class Difference
, class Buffer
>
typename any_range_type_generator<
const SinglePassRange
, Value
, Traversal
, Reference
, Difference
, Buffer
>::type
type_erase(const SinglePassRange& rng
, type_erased<
Value
, Traversal
, Reference
, Difference
, Buffer
> = type_erased<>()
)
{
typedef typename any_range_type_generator<
const SinglePassRange
, Value
, Traversal
, Reference
, Difference
, Buffer
>::type range_type;
return range_type(boost::begin(rng), boost::end(rng));
}
}
} // namespace boost
#endif // include guard
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