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// 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_IF_IMPL_HPP_INCLUDED
#define BOOST_RANGE_ADAPTOR_REPLACED_IF_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/range/concepts.hpp>
#include <boost/iterator/iterator_adaptor.hpp>
#include <boost/iterator/transform_iterator.hpp>
#include <boost/optional/optional.hpp>
namespace boost
{
namespace range_detail
{
template< class Pred, class Value >
class replace_value_if
{
public:
typedef const Value& result_type;
typedef const Value& first_argument_type;
// Rationale:
// required to allow the iterator to be default constructible.
replace_value_if()
{
}
replace_value_if(const Pred& pred, const Value& to)
: m_impl(data(pred, to))
{
}
const Value& operator()(const Value& x) const
{
return m_impl->m_pred(x) ? m_impl->m_to : x;
}
private:
struct data
{
data(const Pred& p, const Value& t)
: m_pred(p), m_to(t)
{
}
Pred m_pred;
Value m_to;
};
boost::optional<data> m_impl;
};
template< class Pred, class R >
class replaced_if_range :
public boost::iterator_range<
boost::transform_iterator<
replace_value_if< Pred, BOOST_DEDUCED_TYPENAME range_value<R>::type >,
BOOST_DEDUCED_TYPENAME range_iterator<R>::type > >
{
private:
typedef replace_value_if< Pred, BOOST_DEDUCED_TYPENAME range_value<R>::type > Fn;
typedef boost::iterator_range<
boost::transform_iterator<
replace_value_if< Pred, 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_if_range( R& r, const Pred& pred, value_type to )
: base_t( make_transform_iterator( boost::begin(r), Fn(pred, to) ),
make_transform_iterator( boost::end(r), Fn(pred, to) ) )
{ }
};
template< class Pred, class T >
class replace_if_holder
{
public:
replace_if_holder( const Pred& pred, const T& to )
: m_pred(pred), m_to(to)
{ }
const Pred& pred() const { return m_pred; }
const T& to() const { return m_to; }
private:
Pred m_pred;
T m_to;
};
template< class Pred, class SinglePassRange >
inline replaced_if_range<Pred, SinglePassRange>
operator|(
SinglePassRange& r,
const replace_if_holder<
Pred,
BOOST_DEDUCED_TYPENAME range_value<SinglePassRange>::type>& f)
{
BOOST_RANGE_CONCEPT_ASSERT((
SinglePassRangeConcept<SinglePassRange>));
return replaced_if_range<Pred, SinglePassRange>(
r, f.pred(), f.to());
}
template< class Pred, class SinglePassRange >
inline replaced_if_range<Pred, const SinglePassRange>
operator|(
const SinglePassRange& r,
const replace_if_holder<
Pred,
BOOST_DEDUCED_TYPENAME range_value<SinglePassRange>::type>& f)
{
BOOST_RANGE_CONCEPT_ASSERT((
SinglePassRangeConcept<const SinglePassRange>));
return replaced_if_range<Pred, const SinglePassRange>(
r, f.pred(), f.to());
}
} // 'range_detail'
using range_detail::replaced_if_range;
namespace adaptors
{
namespace
{
const range_detail::forwarder2TU<range_detail::replace_if_holder>
replaced_if =
range_detail::forwarder2TU<range_detail::replace_if_holder>();
}
template<class Pred, class SinglePassRange>
inline replaced_if_range<Pred, SinglePassRange>
replace_if(SinglePassRange& rng, Pred pred,
BOOST_DEDUCED_TYPENAME range_value<SinglePassRange>::type to)
{
BOOST_RANGE_CONCEPT_ASSERT((
SinglePassRangeConcept<SinglePassRange>));
return range_detail::replaced_if_range<Pred, SinglePassRange>(
rng, pred, to);
}
template<class Pred, class SinglePassRange>
inline replaced_if_range<Pred, const SinglePassRange>
replace_if(
const SinglePassRange& rng,
Pred pred,
BOOST_DEDUCED_TYPENAME range_value<const SinglePassRange>::type to)
{
BOOST_RANGE_CONCEPT_ASSERT((
SinglePassRangeConcept<const SinglePassRange>));
return range_detail::replaced_if_range<Pred, const SinglePassRange>(
rng, pred, to);
}
} // 'adaptors'
} // 'boost'
#endif // include guard
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