135 lines
4.4 KiB
C++
135 lines
4.4 KiB
C++
// Boost.Range library
|
|
//
|
|
// Copyright Neil Groves 2007. 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_REPLACED_IMPL_HPP_INCLUDED
|
|
#define BOOST_RANGE_ADAPTOR_REPLACED_IMPL_HPP_INCLUDED
|
|
|
|
#include <boost/config.hpp>
|
|
#include <boost/range/adaptor/argument_fwd.hpp>
|
|
#include <boost/range/iterator_range.hpp>
|
|
#include <boost/range/begin.hpp>
|
|
#include <boost/range/end.hpp>
|
|
#include <boost/range/value_type.hpp>
|
|
#include <boost/iterator/iterator_adaptor.hpp>
|
|
#include <boost/iterator/transform_iterator.hpp>
|
|
|
|
namespace boost
|
|
{
|
|
namespace range_detail
|
|
{
|
|
template< class Value >
|
|
class replace_value
|
|
{
|
|
public:
|
|
typedef const Value& result_type;
|
|
typedef const Value& first_argument_type;
|
|
|
|
replace_value(const Value& from, const Value& to)
|
|
: m_from(from), m_to(to)
|
|
{
|
|
}
|
|
|
|
const Value& operator()(const Value& x) const
|
|
{
|
|
return (x == m_from) ? m_to : x;
|
|
}
|
|
|
|
private:
|
|
Value m_from;
|
|
Value m_to;
|
|
};
|
|
|
|
template< class R >
|
|
class replaced_range :
|
|
public boost::iterator_range<
|
|
boost::transform_iterator<
|
|
replace_value< BOOST_DEDUCED_TYPENAME range_value<R>::type >,
|
|
BOOST_DEDUCED_TYPENAME range_iterator<R>::type > >
|
|
{
|
|
private:
|
|
typedef replace_value< BOOST_DEDUCED_TYPENAME range_value<R>::type > Fn;
|
|
|
|
typedef boost::iterator_range<
|
|
boost::transform_iterator<
|
|
replace_value< BOOST_DEDUCED_TYPENAME range_value<R>::type >,
|
|
BOOST_DEDUCED_TYPENAME range_iterator<R>::type > > base_t;
|
|
|
|
public:
|
|
typedef BOOST_DEDUCED_TYPENAME range_value<R>::type value_type;
|
|
|
|
replaced_range( R& r, value_type from, value_type to )
|
|
: base_t( make_transform_iterator( boost::begin(r), Fn(from, to) ),
|
|
make_transform_iterator( boost::end(r), Fn(from, to) ) )
|
|
{ }
|
|
};
|
|
|
|
template< class T >
|
|
class replace_holder : public holder2<T>
|
|
{
|
|
public:
|
|
replace_holder( const T& from, const T& to )
|
|
: holder2<T>(from, to)
|
|
{ }
|
|
private:
|
|
// not assignable
|
|
void operator=(const replace_holder&);
|
|
};
|
|
|
|
template< class InputRng >
|
|
inline replaced_range<InputRng>
|
|
operator|( InputRng& r,
|
|
const replace_holder<BOOST_DEDUCED_TYPENAME range_value<InputRng>::type>& f )
|
|
{
|
|
return replaced_range<InputRng>(r, f.val1, f.val2);
|
|
}
|
|
|
|
template< class InputRng >
|
|
inline replaced_range<const InputRng>
|
|
operator|( const InputRng& r,
|
|
const replace_holder<BOOST_DEDUCED_TYPENAME range_value<InputRng>::type>& f )
|
|
{
|
|
return replaced_range<const InputRng>(r, f.val1, f.val2);
|
|
}
|
|
} // 'range_detail'
|
|
|
|
using range_detail::replaced_range;
|
|
|
|
namespace adaptors
|
|
{
|
|
namespace
|
|
{
|
|
const range_detail::forwarder2<range_detail::replace_holder>
|
|
replaced =
|
|
range_detail::forwarder2<range_detail::replace_holder>();
|
|
}
|
|
|
|
template<class InputRange>
|
|
inline replaced_range<InputRange>
|
|
replace(InputRange& rng,
|
|
BOOST_DEDUCED_TYPENAME range_value<InputRange>::type from,
|
|
BOOST_DEDUCED_TYPENAME range_value<InputRange>::type to)
|
|
{
|
|
return replaced_range<InputRange>(rng, from, to);
|
|
}
|
|
|
|
template<class InputRange>
|
|
inline replaced_range<const InputRange>
|
|
replace(const InputRange& rng,
|
|
BOOST_DEDUCED_TYPENAME range_value<const InputRange>::type from,
|
|
BOOST_DEDUCED_TYPENAME range_value<const InputRange>::type to)
|
|
{
|
|
return replaced_range<const InputRange>(rng, from ,to);
|
|
}
|
|
|
|
} // 'adaptors'
|
|
} // 'boost'
|
|
|
|
#endif // include guard
|