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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_MAP_HPP
#define BOOST_RANGE_ADAPTOR_MAP_HPP
#include <boost/range/adaptor/transformed.hpp>
#include <boost/range/iterator_range.hpp>
#include <boost/range/value_type.hpp>
#include <boost/range/reference.hpp>
namespace boost
{
namespace range_detail
{
struct map_keys_forwarder {};
struct map_values_forwarder {};
template< class Map >
struct select_first
{
typedef BOOST_DEDUCED_TYPENAME range_reference<const Map>::type argument_type;
typedef const BOOST_DEDUCED_TYPENAME range_value<const Map>::type::first_type& result_type;
result_type operator()( argument_type r ) const
{
return r.first;
}
};
template< class Map >
struct select_second_mutable
{
typedef BOOST_DEDUCED_TYPENAME range_reference<Map>::type argument_type;
typedef BOOST_DEDUCED_TYPENAME range_value<Map>::type::second_type& result_type;
result_type operator()( argument_type r ) const
{
return r.second;
}
};
template< class Map >
struct select_second_const
{
typedef BOOST_DEDUCED_TYPENAME range_reference<const Map>::type argument_type;
typedef const BOOST_DEDUCED_TYPENAME range_value<const Map>::type::second_type& result_type;
result_type operator()( argument_type r ) const
{
return r.second;
}
};
template<class StdPairRng>
class select_first_range
: public transformed_range<
select_first<StdPairRng>,
const StdPairRng>
{
typedef transformed_range<select_first<StdPairRng>, const StdPairRng> base;
public:
typedef select_first<StdPairRng> transform_fn_type;
typedef const StdPairRng source_range_type;
select_first_range(transform_fn_type fn, source_range_type& rng)
: base(fn, rng)
{
}
select_first_range(const base& other) : base(other) {}
};
template<class StdPairRng>
class select_second_mutable_range
: public transformed_range<
select_second_mutable<StdPairRng>,
StdPairRng>
{
typedef transformed_range<select_second_mutable<StdPairRng>, StdPairRng> base;
public:
typedef select_second_mutable<StdPairRng> transform_fn_type;
typedef StdPairRng source_range_type;
select_second_mutable_range(transform_fn_type fn, source_range_type& rng)
: base(fn, rng)
{
}
select_second_mutable_range(const base& other) : base(other) {}
};
template<class StdPairRng>
class select_second_const_range
: public transformed_range<
select_second_const<StdPairRng>,
const StdPairRng>
{
typedef transformed_range<select_second_const<StdPairRng>, const StdPairRng> base;
public:
typedef select_second_const<StdPairRng> transform_fn_type;
typedef const StdPairRng source_range_type;
select_second_const_range(transform_fn_type fn, source_range_type& rng)
: base(fn, rng)
{
}
select_second_const_range(const base& other) : base(other) {}
};
template< class StdPairRng >
inline select_first_range<StdPairRng>
operator|( const StdPairRng& r, map_keys_forwarder )
{
return operator|( r,
boost::adaptors::transformed( select_first<StdPairRng>() ) );
}
template< class StdPairRng >
inline select_second_mutable_range<StdPairRng>
operator|( StdPairRng& r, map_values_forwarder )
{
return operator|( r,
boost::adaptors::transformed( select_second_mutable<StdPairRng>() ) );
}
template< class StdPairRng >
inline select_second_const_range<StdPairRng>
operator|( const StdPairRng& r, map_values_forwarder )
{
return operator|( r,
boost::adaptors::transformed( select_second_const<StdPairRng>() ) );
}
} // 'range_detail'
using range_detail::select_first_range;
using range_detail::select_second_mutable_range;
using range_detail::select_second_const_range;
namespace adaptors
{
namespace
{
const range_detail::map_keys_forwarder map_keys =
range_detail::map_keys_forwarder();
const range_detail::map_values_forwarder map_values =
range_detail::map_values_forwarder();
}
template<class StdPairRange>
inline select_first_range<StdPairRange>
keys(const StdPairRange& rng)
{
return select_first_range<StdPairRange>(
range_detail::select_first<StdPairRange>(), rng );
}
template<class StdPairRange>
inline select_second_const_range<StdPairRange>
values(const StdPairRange& rng)
{
return select_second_const_range<StdPairRange>(
range_detail::select_second_const<StdPairRange>(), rng );
}
template<class StdPairRange>
inline select_second_mutable_range<StdPairRange>
values(StdPairRange& rng)
{
return select_second_mutable_range<StdPairRange>(
range_detail::select_second_mutable<StdPairRange>(), rng );
}
} // 'adaptors'
}
#endif
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