97 lines
3.0 KiB
C
97 lines
3.0 KiB
C
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//
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// SPDX-License-Identifier: BSD-3-Clause
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// Copyright Contributors to the OpenEXR Project.
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//
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//
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// The Imath library namespace
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//
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// The purpose of this file is to make it possible to specify an
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// IMATH_INTERNAL_NAMESPACE as a preprocessor definition and have all of the
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// Imath symbols defined within that namespace rather than the standard
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// Imath namespace. Those symbols are made available to client code through
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// the IMATH_NAMESPACE in addition to the IMATH_INTERNAL_NAMESPACE.
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//
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// To ensure source code compatibility, the IMATH_NAMESPACE defaults to Imath
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// and then "using namespace IMATH_INTERNAL_NAMESPACE;" brings all of the
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// declarations from the IMATH_INTERNAL_NAMESPACE into the IMATH_NAMESPACE.
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// This means that client code can continue to use syntax like Imath::V3f,
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// but at link time it will resolve to a mangled symbol based on the
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// IMATH_INTERNAL_NAMESPACE.
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//
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// As an example, if one needed to build against a newer version of Imath and
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// have it run alongside an older version in the same application, it is now
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// possible to use an internal namespace to prevent collisions between the
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// older versions of Imath symbols and the newer ones. To do this, the
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// following could be defined at build time:
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//
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// IMATH_INTERNAL_NAMESPACE = Imath_v2
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//
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// This means that declarations inside Imath headers look like this (after
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// the preprocessor has done its work):
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//
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// namespace Imath_v2 {
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// ...
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// class declarations
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// ...
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// }
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//
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// namespace Imath {
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// using namespace Imath_v2;
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// }
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//
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#ifndef INCLUDED_IMATHNAMESPACE_H
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#define INCLUDED_IMATHNAMESPACE_H
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/// @cond Doxygen_Suppress
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#include "ImathConfig.h"
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#ifndef IMATH_NAMESPACE
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# define IMATH_NAMESPACE Imath
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#endif
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#ifndef IMATH_INTERNAL_NAMESPACE
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# define IMATH_INTERNAL_NAMESPACE IMATH_NAMESPACE
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#endif
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#ifdef __cplusplus
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//
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// We need to be sure that we import the internal namespace into the public one.
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// To do this, we use the small bit of code below which initially defines
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// IMATH_INTERNAL_NAMESPACE (so it can be referenced) and then defines
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// IMATH_NAMESPACE and pulls the internal symbols into the public
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// namespace.
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//
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namespace IMATH_INTERNAL_NAMESPACE
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{}
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namespace IMATH_NAMESPACE
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{
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using namespace IMATH_INTERNAL_NAMESPACE;
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}
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//
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// There are identical pairs of HEADER/SOURCE ENTER/EXIT macros so that
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// future extension to the namespace mechanism is possible without changing
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// project source code.
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//
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#define IMATH_INTERNAL_NAMESPACE_HEADER_ENTER \
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namespace IMATH_INTERNAL_NAMESPACE \
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{
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#define IMATH_INTERNAL_NAMESPACE_HEADER_EXIT }
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#define IMATH_INTERNAL_NAMESPACE_SOURCE_ENTER \
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namespace IMATH_INTERNAL_NAMESPACE \
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{
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#define IMATH_INTERNAL_NAMESPACE_SOURCE_EXIT }
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#endif // __cplusplus
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/// @endcond
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#endif /* INCLUDED_IMATHNAMESPACE_H */
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