Bundle Boost.Range (from 1.57.0).

boost/range/adaptor/replaced_if.hpp

@@ -0,0 +1,177 @@
+// 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