整理

include/boost/optional/bad_optional_access.hpp

@@ -0,0 +1,41 @@
+// Copyright (C) 2014, 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:
+//  akrzemi1@gmail.com
+//
+#ifndef BOOST_BAD_OPTIONAL_ACCESS_22MAY2014_HPP
+#define BOOST_BAD_OPTIONAL_ACCESS_22MAY2014_HPP
+
+#include <stdexcept>
+#if __cplusplus < 201103L
+#include <string> // to make converting-ctor std::string(char const*) visible
+#endif
+
+namespace boost {
+
+#if defined(__clang__)
+# pragma clang diagnostic push
+# pragma clang diagnostic ignored "-Wweak-vtables"
+#endif
+
+class bad_optional_access : public std::logic_error
+{
+public:
+  bad_optional_access()
+    : std::logic_error("Attempted to access the value of an uninitialized optional object.")
+    {}
+};
+
+#if defined(__clang__)
+# pragma clang diagnostic pop
+#endif
+
+} // namespace boost
+
+#endif