整理

include/boost/indirect_reference.hpp

@@ -0,0 +1,46 @@
+#ifndef BOOST_INDIRECT_REFERENCE_DWA200415_HPP
+#define BOOST_INDIRECT_REFERENCE_DWA200415_HPP
+
+//
+// Copyright David Abrahams 2004. 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)
+//
+// typename indirect_reference<P>::type provides the type of *p.
+//
+// http://www.boost.org/libs/iterator/doc/pointee.html
+//
+
+#include <type_traits>
+
+#include <boost/detail/is_incrementable.hpp>
+#include <boost/iterator/iterator_traits.hpp>
+#include <boost/pointee.hpp>
+
+namespace boost {
+namespace detail {
+
+template< typename P >
+struct smart_ptr_reference
+{
+    using type = boost::pointee_t< P >&;
+};
+
+} // namespace detail
+
+template< typename P >
+struct indirect_reference :
+    std::conditional<
+        detail::is_incrementable< P >::value,
+        iterator_reference< P >,
+        detail::smart_ptr_reference< P >
+    >::type
+{
+};
+
+template< typename P >
+using indirect_reference_t = typename indirect_reference< P >::type;
+
+} // namespace boost
+
+#endif // BOOST_INDIRECT_REFERENCE_DWA200415_HPP