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cs440-acg/ext/openexr/IlmBase/Iex/IexNamespace.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_IEXNAMESPACE_H
+#define INCLUDED_IEXNAMESPACE_H
+
+//
+// The purpose of this file is to make it possible to specify an
+// IEX_INTERNAL_NAMESPACE as a preprocessor definition and have all of the
+// Iex symbols defined within that namespace rather than the standard
+// Iex namespace.  Those symbols are made available to client code through
+// the IEX_NAMESPACE in addition to the IEX_INTERNAL_NAMESPACE.
+//
+// To ensure source code compatibility, the IEX_NAMESPACE defaults to Iex
+// and then "using namespace IEX_INTERNAL_NAMESPACE;" brings all of the
+// declarations from the IEX_INTERNAL_NAMESPACE into the IEX_NAMESPACE.  This
+// means that client code can continue to use syntax like Iex::BaseExc, but
+// at link time it will resolve to a mangled symbol based on the
+// IEX_INTERNAL_NAMESPACE.
+//
+// As an example, if one needed to build against a newer version of Iex 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 Iex symbols and the newer ones.  To do this, the
+// following could be defined at build time:
+//
+// IEX_INTERNAL_NAMESPACE = Iex_v2
+//
+// This means that declarations inside Iex headers look like this (after the
+// preprocessor has done its work):
+//
+// namespace Iex_v2 {
+//     ...
+//     class declarations
+//     ...
+// }
+//
+// namespace Iex {
+//     using namespace Iex_v2;
+// }
+//
+
+//
+// Open Source version of this file pulls in the IlmBaseConfig.h file
+// for the configure time options.
+//
+#include "IlmBaseConfig.h"
+
+#if defined(_MSC_VER)
+#  pragma warning(push)
+#  pragma warning(disable: 4515) //  warning C4515: 'Imf': namespace uses itself
+#endif
+
+#ifndef IEX_NAMESPACE
+#define IEX_NAMESPACE Iex
+#endif
+
+#ifndef IEX_INTERNAL_NAMESPACE
+#define IEX_INTERNAL_NAMESPACE IEX_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
+// IEX_INTERNAL_NAMESPACE (so it can be referenced) and then defines
+// IEX_NAMESPACE and pulls the internal symbols into the public namespace.
+//
+
+namespace IEX_INTERNAL_NAMESPACE {}
+namespace IEX_NAMESPACE {
+    using namespace IEX_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 IEX_INTERNAL_NAMESPACE_HEADER_ENTER namespace IEX_INTERNAL_NAMESPACE {
+#define IEX_INTERNAL_NAMESPACE_HEADER_EXIT }
+
+#define IEX_INTERNAL_NAMESPACE_SOURCE_ENTER namespace IEX_INTERNAL_NAMESPACE {
+#define IEX_INTERNAL_NAMESPACE_SOURCE_EXIT }
+
+#if defined(_MSC_VER)
+#  pragma warning(pop)
+#endif
+
+#endif // INCLUDED_IEXNAMESPACE_H