Boost.RangeEx merged into Boost.Range

[SVN r60897]

include/boost/range/algorithm/transform.hpp

@@ -0,0 +1,85 @@
+//  Copyright Neil Groves 2009. 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_ALGORITHM_TRANSFORM_HPP_INCLUDED
+#define BOOST_RANGE_ALGORITHM_TRANSFORM_HPP_INCLUDED
+
+#include <boost/assert.hpp>
+#include <boost/concept_check.hpp>
+#include <boost/range/begin.hpp>
+#include <boost/range/end.hpp>
+#include <boost/range/concepts.hpp>
+#include <algorithm>
+
+namespace boost
+{
+    /// \brief template function transform
+    ///
+    /// range-based version of the transform std algorithm
+    ///
+    /// \pre SinglePassRange1 is a model of the SinglePassRangeConcept
+    /// \pre SinglePassRange2 is a model of the SinglePassRangeConcept
+    /// \pre OutputIterator is a model of the OutputIteratorConcept
+    /// \pre UnaryOperation is a model of the UnaryFunctionConcept
+    /// \pre BinaryOperation is a model of the BinaryFunctionConcept
+    template< class SinglePassRange1,
+              class OutputIterator,
+              class UnaryOperation >
+    inline OutputIterator
+    transform(const SinglePassRange1& rng,
+              OutputIterator          out,
+              UnaryOperation          fun)
+    {
+        return std::transform(boost::begin(rng),boost::end(rng),out,fun);
+    }
+
+    namespace range_detail
+    {
+        template< class SinglePassTraversalReadableIterator1,
+                  class SinglePassTraversalReadableIterator2,
+                  class OutputIterator,
+                  class BinaryFunction >
+        inline OutputIterator
+        transform_impl(SinglePassTraversalReadableIterator1 first1,
+                       SinglePassTraversalReadableIterator1 last1,
+                       SinglePassTraversalReadableIterator2 first2,
+                       SinglePassTraversalReadableIterator2 last2,
+                       OutputIterator                       out,
+                       BinaryFunction                       fn)
+        {
+            for (; first1 != last1; ++first1, ++first2)
+            {
+                BOOST_ASSERT( first2 != last2 );
+                *out = fn(*first1, *first2);
+                ++out;
+            }
+            return out;
+        }
+    }
+
+    /// \overload
+    template< class SinglePassRange1,
+              class SinglePassRange2,
+              class OutputIterator,
+              class BinaryOperation >
+    inline OutputIterator
+    transform(const SinglePassRange1& rng1,
+              const SinglePassRange2& rng2,
+              OutputIterator          out,
+              BinaryOperation         fun)
+    {
+        boost::function_requires< SinglePassRangeConcept<SinglePassRange1> >();
+        boost::function_requires< SinglePassRangeConcept<SinglePassRange2> >();
+        return range_detail::transform_impl(
+                    boost::begin(rng1), boost::end(rng1),
+                    boost::begin(rng2), boost::end(rng2),
+                    out, fun);
+    }
+}
+
+#endif // include guard