105 lines
3.2 KiB
C++
105 lines
3.2 KiB
C++
// 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
|