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cs440-acg/ext/openexr/IlmBase/IlmThread/IlmThreadNamespace.h

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+///////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2012, Industrial Light & Magic, a division of Lucas
+// Digital Ltd. LLC
+// 
+// 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 Industrial Light & Magic 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 INCLUDED_ILMTHREADNAMESPACE_H
+#define INCLUDED_ILMTHREADNAMESPACE_H
+
+//
+// The purpose of this file is to make it possible to specify an
+// ILMTHREAD_INTERNAL_NAMESPACE as a preprocessor definition and have all of
+// the IlmThread symbols defined within that namespace rather than the
+// standard IlmThread namespace.  Those symbols are made available to client
+// code through the ILMTHREAD_NAMESPACE in addition to the
+// ILMTHREAD_INTERNAL_NAMESPACE.
+//
+// To ensure source code compatibility, the ILMTHREAD_NAMESPACE defaults to
+// IlmThread and then "using namespace ILMTHREAD_INTERNAL_NAMESPACE;" brings
+// all of the declarations from the ILMTHREAD_INTERNAL_NAMESPACE into the
+// ILMTHREAD_NAMESPACE.  This means that client code can continue to use
+// syntax like IlmThread::Thread, but at link time it will resolve to a
+// mangled symbol based on the ILMTHREAD_INTERNAL_NAMESPACE.
+//
+// As an example, if one needed to build against a newer version of IlmThread
+// and have it run alongside an older version in the same application, it is
+// now possible to use an internal namespace to prevent collisions between
+// the older versions of IlmThread symbols and the newer ones.  To do this,
+// the following could be defined at build time:
+//
+// ILMTHREAD_INTERNAL_NAMESPACE = IlmThread_v2
+//
+// This means that declarations inside IlmThread headers look like this
+// (after the preprocessor has done its work):
+//
+// namespace IlmThread_v2 {
+//     ...
+//     class declarations
+//     ...
+// }
+//
+// namespace IlmThread {
+//     using namespace IlmThread_v2;
+// }
+//
+
+//
+// Open Source version of this file pulls in the IlmBaseConfig.h file
+// for the configure time options.
+//
+#include "IlmBaseConfig.h"
+
+#ifndef ILMTHREAD_NAMESPACE
+#define ILMTHREAD_NAMESPACE IlmThread
+#endif
+
+#ifndef ILMTHREAD_INTERNAL_NAMESPACE
+#define ILMTHREAD_INTERNAL_NAMESPACE ILMTHREAD_NAMESPACE
+#endif
+
+//
+// We need to be sure that we import the internal namespace into the public one.
+// To do this, we use the small bit of code below which initially defines
+// ILMTHREAD_INTERNAL_NAMESPACE (so it can be referenced) and then defines
+// ILMTHREAD_NAMESPACE and pulls the internal symbols into the public
+// namespace.
+//
+
+namespace ILMTHREAD_INTERNAL_NAMESPACE {}
+namespace ILMTHREAD_NAMESPACE {
+     using namespace ILMTHREAD_INTERNAL_NAMESPACE;
+}
+
+//
+// There are identical pairs of HEADER/SOURCE ENTER/EXIT macros so that
+// future extension to the namespace mechanism is possible without changing
+// project source code.
+//
+
+#define ILMTHREAD_INTERNAL_NAMESPACE_HEADER_ENTER namespace ILMTHREAD_INTERNAL_NAMESPACE {
+#define ILMTHREAD_INTERNAL_NAMESPACE_HEADER_EXIT }
+
+#define ILMTHREAD_INTERNAL_NAMESPACE_SOURCE_ENTER namespace ILMTHREAD_INTERNAL_NAMESPACE {
+#define ILMTHREAD_INTERNAL_NAMESPACE_SOURCE_EXIT }
+
+#endif // INCLUDED_ILMTHREADNAMESPACE_H