experimental optional config test

include/boost/optional/detail/optional_config.hpp

@@ -52,4 +52,11 @@
 # define BOOST_OPTIONAL_DETAIL_USE_ATTRIBUTE_MAY_ALIAS
 #endif
 
+#if (defined(_MSC_VER) && _MSC_VER <= 1800)
+// on MSCV 2013 and earlier an unwanted temporary is created when you assign from
+// a const lvalue of integral type. Thus we bind not to the original address but
+// to a temporary. 
+# define BOOST_OPTIONAL_CONFIG_NO_PROPER_ASSIGN_FROM_CONST_INT
+#endif
+
 #endif // header guard

test/Jamfile.v2

@@ -60,5 +60,7 @@ import testing ;
     [ compile-fail optional_test_fail_io_without_io.cpp ]
     [ compile-fail optional_test_fail_none_io_without_io.cpp ]
     [ compile-fail optional_test_fail_convert_assign_of_enums.cpp ]
+    [ run optional_xconfig_NO_PROPER_ASSIGN_FROM_CONST_INT_pass.cpp ]
+    [ run-fail optional_xconfig_NO_PROPER_ASSIGN_FROM_CONST_INT_fail.cpp ]
   ;
 }

test/optional_xconfig_NO_PROPER_ASSIGN_FROM_CONST_INT_fail.cpp

@@ -0,0 +1,42 @@
+// Copyright (C) 2015 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/lib/optional for documentation.
+//
+// You are welcome to contact the author at:
+//  akrzemi1@gmail.com
+
+#include "boost/core/lightweight_test.hpp"
+#include "boost/optional/detail/optional_config.hpp"
+
+#ifndef BOOST_OPTIONAL_CONFIG_NO_PROPER_ASSIGN_FROM_CONST_INT
+
+int main()
+{
+  BOOST_ERROR("failed as requested");
+  return boost::report_errors();
+}
+
+#else
+
+const int global_i = 0;
+
+struct Binder
+{
+  void operator=(const int& i)
+  {
+    BOOST_TEST(&i == &global_i);
+  }
+};
+
+int main()
+{
+  Binder s;
+  s = global_i;
+  return boost::report_errors();
+}
+
+#endif

test/optional_xconfig_NO_PROPER_ASSIGN_FROM_CONST_INT_pass.cpp

@@ -0,0 +1,41 @@
+// Copyright (C) 2015 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/lib/optional for documentation.
+//
+// You are welcome to contact the author at:
+//  akrzemi1@gmail.com
+
+#include "boost/core/lightweight_test.hpp"
+#include "boost/optional/detail/optional_config.hpp"
+
+#ifndef BOOST_OPTIONAL_CONFIG_NO_PROPER_ASSIGN_FROM_CONST_INT
+
+const int global_i = 0;
+
+struct Binder
+{
+  void operator=(const int& i)
+  {
+    BOOST_TEST(&i == &global_i);
+  }
+};
+
+int main()
+{
+  Binder s;
+  s = global_i;
+  return boost::report_errors();
+}
+
+#else
+
+int main()
+{
+  return boost::report_errors();
+}
+
+#endif

test/optional_xconfig_NO_PROPER_CONVERT_FROM_CONST_INT_fail.cpp

@@ -0,0 +1,41 @@
+// Copyright (C) 2015 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/lib/optional for documentation.
+//
+// You are welcome to contact the author at:
+//  akrzemi1@gmail.com
+
+#include "boost/core/lightweight_test.hpp"
+#include "boost/optional/detail/optional_config.hpp"
+
+#ifndef BOOST_OPTIONAL_CONFIG_NO_PROPER_ASSIGN_FROM_CONST_INT
+
+int main()
+{
+  BOOST_ERROR("failed as requested");
+  return boost::report_errors();
+}
+
+#else
+
+const int global_i = 0;
+
+struct Binder
+{
+	Binder(const int& i)
+	{
+		BOOST_TEST(&i == &global_i);
+  }
+};
+
+int main()
+{
+  Binder b = global_i;
+  return boost::report_errors();
+}
+
+#endif

test/optional_xconfig_NO_PROPER_CONVERT_FROM_CONST_INT_pass.cpp

@@ -0,0 +1,40 @@
+// Copyright (C) 2015 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/lib/optional for documentation.
+//
+// You are welcome to contact the author at:
+//  akrzemi1@gmail.com
+
+#include "boost/core/lightweight_test.hpp"
+#include "boost/optional/detail/optional_config.hpp"
+
+#ifndef BOOST_OPTIONAL_CONFIG_NO_PROPER_ASSIGN_FROM_CONST_INT
+
+const int global_i = 0;
+
+struct Binder
+{
+	Binder(const int& i)
+	{
+		BOOST_TEST(&i == &global_i);
+  }
+};
+
+int main()
+{
+  Binder b = global_i;
+  return boost::report_errors();
+}
+
+#else
+
+int main()
+{
+  return boost::report_errors();
+}
+
+#endif