///////////////////////////////////////////////////////////////////////////

//

// 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,

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// 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"

#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 }

#endif /* INCLUDED_IMFNAMESPACE_H */