Boost.Range added unit tests for extended algorithms.

Put the extended algorithms into boost::range in a similar manner to the standard algorithms.
Added iota as an extended algorithm.
Fixed defects in the extended algorithms brought to light by the new unit tests.

[SVN r61042]

include/boost/range/algorithm_ext/iota.hpp

@@ -0,0 +1,39 @@
+// Boost.Range library
+//
+//  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_EXT_IOTA_HPP_INCLUDED
+#define BOOST_RANGE_ALGORITHM_EXT_IOTA_HPP_INCLUDED
+
+#include <boost/range/config.hpp>
+#include <boost/range/concepts.hpp>
+#include <boost/range/iterator.hpp>
+#include <boost/range/begin.hpp>
+#include <boost/range/end.hpp>
+
+namespace boost
+{
+    namespace range
+    {
+
+template< class ForwardRange, class Value >
+inline void iota( ForwardRange& rng, Value x )
+{
+    BOOST_CONCEPT_ASSERT(( ForwardRangeConcept<ForwardRange> ));
+    typedef BOOST_DEDUCED_TYPENAME range_iterator<ForwardRange>::type iterator_t;
+
+    iterator_t last_target = ::boost::end(rng);
+    for (iterator_t target = ::boost::begin(rng); target != last_target; ++target, ++x)
+        *target = x;
+}
+
+    } // namespace range
+    using range::iota;
+} // namespace boost
+
+#endif // include guard