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pxshared/include/foundation/PxUnionCast.h

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+//
+// 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 NVIDIA CORPORATION 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 ''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.
+//
+// Copyright (c) 2008-2021 NVIDIA Corporation. All rights reserved.
+// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
+// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
+
+#ifndef PXFOUNDATION_PXUNIONCAST_H
+#define PXFOUNDATION_PXUNIONCAST_H
+
+#include "foundation/Px.h"
+
+/** \addtogroup foundation
+@{
+*/
+
+#if !PX_DOXYGEN
+namespace physx
+{
+#endif
+
+// Needed for clang 7
+#if PX_CLANG && PX_CLANG_MAJOR >= 7
+ #define USE_VOLATILE_UNION volatile 
+#else
+ #define USE_VOLATILE_UNION
+#endif
+
+template <class A, class B>
+PX_FORCE_INLINE A PxUnionCast(B b)
+{
+	union AB
+	{
+		AB(B bb) : _b(bb)
+		{
+		}
+		 B _b;
+		 A _a;
+	} USE_VOLATILE_UNION u(b);
+	return u._a;
+}
+
+#undef USE_VOLATILE_UNION
+
+#if !PX_DOXYGEN
+} // namespace physx
+#endif
+
+/** @} */
+
+#endif // PXFOUNDATION_PXUNIONCAST_H