/usr/include/boost/range/adaptor/filtered.hpp is in libboost1.49-dev 1.49.0-3.2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 | // 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_FILTERED_HPP
#define BOOST_RANGE_ADAPTOR_FILTERED_HPP
#include <boost/range/adaptor/argument_fwd.hpp>
#include <boost/range/iterator_range.hpp>
#include <boost/iterator/filter_iterator.hpp>
namespace boost
{
namespace range_detail
{
template< class P, class R >
struct filtered_range :
boost::iterator_range<
boost::filter_iterator< P,
BOOST_DEDUCED_TYPENAME range_iterator<R>::type
>
>
{
private:
typedef boost::iterator_range<
boost::filter_iterator< P,
BOOST_DEDUCED_TYPENAME range_iterator<R>::type
>
> base;
public:
filtered_range( P p, R& r )
: base( make_filter_iterator( p, boost::begin(r), boost::end(r) ),
make_filter_iterator( p, boost::end(r), boost::end(r) ) )
{ }
};
template< class T >
struct filter_holder : holder<T>
{
filter_holder( T r ) : holder<T>(r)
{ }
};
template< class InputRng, class Predicate >
inline filtered_range<Predicate, InputRng>
operator|( InputRng& r,
const filter_holder<Predicate>& f )
{
return filtered_range<Predicate, InputRng>( f.val, r );
}
template< class InputRng, class Predicate >
inline filtered_range<Predicate, const InputRng>
operator|( const InputRng& r,
const filter_holder<Predicate>& f )
{
return filtered_range<Predicate, const InputRng>( f.val, r );
}
} // 'range_detail'
// Unusual use of 'using' is intended to bring filter_range into the boost namespace
// while leaving the mechanics of the '|' operator in range_detail and maintain
// argument dependent lookup.
// filter_range logically needs to be in the boost namespace to allow user of
// the library to define the return type for filter()
using range_detail::filtered_range;
namespace adaptors
{
namespace
{
const range_detail::forwarder<range_detail::filter_holder>
filtered =
range_detail::forwarder<range_detail::filter_holder>();
}
template<class InputRange, class Predicate>
inline filtered_range<Predicate, InputRange>
filter(InputRange& rng, Predicate filter_pred)
{
return range_detail::filtered_range<Predicate, InputRange>( filter_pred, rng );
}
template<class InputRange, class Predicate>
inline filtered_range<Predicate, const InputRange>
filter(const InputRange& rng, Predicate filter_pred)
{
return range_detail::filtered_range<Predicate, const InputRange>( filter_pred, rng );
}
} // 'adaptors'
}
#endif
|