Adding a macro for library writers to do version namespaces.

Author: ProgramMax

Libraries/max/Compiling/CurrentVersionNamespace.hpp

@@ -0,0 +1,49 @@
+// Copyright 2015, Chris Blume
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Chris Blume nor the
+// names of its contributors may be used to endorse or promote products
+// derived from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef MAX_COMPILING_CURRENTVERSIONNAMESPACE_HPP
+#define MAX_COMPILING_CURRENTVERSIONNAMESPACE_HPP
+
+// Note: These two macro definitions do not behave identically.
+// Inline namespaces from C++11 allow templated types to be specialized
+// from their included namespace. Using namespace does not allow that.
+// Additionally, the parent namespace is included in ADL with
+// inline namespaces.
+
+#include <max/Compiling/Configuration/Compiler.hpp>
+
+#ifndef MAX_INLINE_NAMESPACES_SUPPORTED
+	#define MAX_CURRENT_VERSION_NAMESPACE_BEGIN( Name ) inline namespace Name
+	#define MAX_CURRENT_VERSION_NAMESPACE_END( Name )
+#else
+	#define MAX_CURRENT_VERSION_NAMESPACE_BEGIN( Name ) namespace Name
+	#define MAX_CURRENT_VERSION_NAMESPACE_END( Name )   using namespace Name;
+#endif
+
+#endif // #ifndef MAX_COMPILING_CURRENTVERSIONNAMESPACE_HPP