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// Boost.Range library
//
// Copyright Thorsten Ottosen, Neil Groves 2006 - 2008. 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_TRANSFORMED_HPP
#define BOOST_RANGE_ADAPTOR_TRANSFORMED_HPP
#include <boost/range/adaptor/argument_fwd.hpp>
#include <boost/range/iterator_range.hpp>
#include <boost/iterator/transform_iterator.hpp>
#include <boost/utility/result_of.hpp>
namespace boost
{
namespace range_detail
{
template< class F, class R >
struct transformed_range :
public boost::iterator_range<
boost::transform_iterator< F,
BOOST_DEDUCED_TYPENAME range_iterator<R>::type
>
>
{
private:
typedef boost::iterator_range<
boost::transform_iterator< F,
BOOST_DEDUCED_TYPENAME range_iterator<R>::type
>
>
base;
public:
typedef F transform_fn_type;
typedef R source_range_type;
transformed_range( F f, R& r )
: base( boost::make_transform_iterator( boost::begin(r), f ),
boost::make_transform_iterator( boost::end(r), f ) )
{ }
};
template< class T >
struct transform_holder : holder<T>
{
transform_holder( T r ) : holder<T>(r)
{ }
};
template< class InputRng, class UnaryFunction >
inline transformed_range<UnaryFunction,InputRng>
operator|( InputRng& r,
const transform_holder<UnaryFunction>& f )
{
return transformed_range<UnaryFunction,InputRng>( f.val, r );
}
template< class InputRng, class UnaryFunction >
inline transformed_range<UnaryFunction, const InputRng>
operator|( const InputRng& r,
const transform_holder<UnaryFunction>& f )
{
return transformed_range<UnaryFunction, const InputRng>( f.val, r );
}
} // 'range_detail'
using range_detail::transformed_range;
namespace adaptors
{
namespace
{
const range_detail::forwarder<range_detail::transform_holder>
transformed =
range_detail::forwarder<range_detail::transform_holder>();
}
template<class UnaryFunction, class InputRange>
inline transformed_range<UnaryFunction, InputRange>
transform(InputRange& rng, UnaryFunction fn)
{
return transformed_range<UnaryFunction, InputRange>(fn, rng);
}
template<class UnaryFunction, class InputRange>
inline transformed_range<UnaryFunction, const InputRange>
transform(const InputRange& rng, UnaryFunction fn)
{
return transformed_range<UnaryFunction, const InputRange>(fn, rng);
}
} // 'adaptors'
}
#endif
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