整理

include/boost/optional/detail/optional_factory_support.hpp

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+// Copyright (C) 2003, 2008 Fernando Luis Cacciola Carballal.
+// Copyright (C) 2016 Andrzej Krzemienski.
+//
+// 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)
+//
+// See http://www.boost.org/libs/optional for documentation.
+//
+// You are welcome to contact the author at:
+//  fernando_cacciola@hotmail.com
+//  akrzemi1@gmail.com
+
+#ifndef BOOST_OPTIONAL_OPTIONAL_DETAIL_OPTIONAL_FACTORY_SUPPORT_AJK_12FEB2016_HPP
+#define BOOST_OPTIONAL_OPTIONAL_DETAIL_OPTIONAL_FACTORY_SUPPORT_AJK_12FEB2016_HPP
+
+// Daniel Wallin discovered that bind/apply.hpp badly interacts with the apply<>
+// member template of a factory as used in the optional<> implementation.
+// He proposed this simple fix which is to move the call to apply<> outside
+// namespace boost.
+namespace boost_optional_detail
+{
+  template <class T, class Factory>
+  inline void construct(Factory const& factory, void* address)
+  {
+    factory.BOOST_NESTED_TEMPLATE apply<T>(address);
+  }
+}
+
+namespace boost
+{
+  class in_place_factory_base ;
+  class typed_in_place_factory_base ;
+}
+
+#endif // header guard