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cs440-acg/ext/openexr/OpenEXR/IlmImf/ImfNamespace.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_IMFNAMESPACE_H
+#define INCLUDED_IMFNAMESPACE_H
+
+//
+// The purpose of this file is to have all of the Imath symbols defined within 
+// the OPENEXR_IMF_INTERNAL_NAMESPACE namespace rather than the standard Imath
+// namespace. Those symbols are made available to client code through the 
+// OPENEXR_IMF_NAMESPACE in addition to the OPENEXR_IMF_INTERNAL_NAMESPACE.
+//
+// To ensure source code compatibility, the OPENEXR_IMF_NAMESPACE defaults to
+// Imath and then "using namespace OPENEXR_IMF_INTERNAL_NAMESPACE;" brings all
+// of the declarations from the OPENEXR_IMF_INTERNAL_NAMESPACE into the
+// OPENEXR_IMF_NAMESPACE.
+// This means that client code can continue to use syntax like
+// Imf::Header, but at link time it will resolve to a
+// mangled symbol based on the OPENEXR_IMF_INTERNAL_NAMESPACE.
+//
+// As an example, if one needed to build against a newer version of Imath 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 Imath symbols and the newer ones.  To do this, the
+// following could be defined at build time:
+//
+// OPENEXR_IMF_INTERNAL_NAMESPACE = Imf_v2
+//
+// This means that declarations inside Imath headers look like this (after
+// the preprocessor has done its work):
+//
+// namespace Imf_v2 {
+//     ...
+//     class declarations
+//     ...
+// }
+//
+// namespace Imf {
+//     using namespace IMF_NAMESPACE_v2;
+// }
+//
+
+//
+// Open Source version of this file pulls in the OpenEXRConfig.h file
+// for the configure time options.
+//
+#include "OpenEXRConfig.h"
+
+#if defined(_MSC_VER)
+  #pragma warning(push)
+  #pragma warning(disable: 4515) //  warning C4515: 'Imf': namespace uses itself
+#endif
+
+#ifndef OPENEXR_IMF_NAMESPACE
+#define OPENEXR_IMF_NAMESPACE Imf
+#endif
+
+#ifndef OPENEXR_IMF_INTERNAL_NAMESPACE
+#define OPENEXR_IMF_INTERNAL_NAMESPACE OPENEXR_IMF_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
+// OPENEXR_IMF_INTERNAL_NAMESPACE (so it can be referenced) and then defines
+// OPENEXR_IMF_NAMESPACE and pulls the internal symbols into the public
+// namespace.
+//
+
+namespace OPENEXR_IMF_INTERNAL_NAMESPACE {}
+namespace OPENEXR_IMF_NAMESPACE {
+     using namespace OPENEXR_IMF_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 OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER namespace OPENEXR_IMF_INTERNAL_NAMESPACE {
+#define OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT }
+
+#define OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER namespace OPENEXR_IMF_INTERNAL_NAMESPACE {
+#define OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_EXIT }
+
+#if defined(_MSC_VER)
+#  pragma warning(pop)
+#endif
+
+#endif /* INCLUDED_IMFNAMESPACE_H */