82 lines
1.9 KiB
C
82 lines
1.9 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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// This file contains functions and constants which aren't
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// provided by the system libraries, compilers, or includes on
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// certain platforms.
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//
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#ifndef INCLUDED_IMATHPLATFORM_H
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#define INCLUDED_IMATHPLATFORM_H
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/// @cond Doxygen_Suppress
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#include <math.h>
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#include "ImathNamespace.h"
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#ifdef __cplusplus
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IMATH_INTERNAL_NAMESPACE_HEADER_ENTER
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//
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// Helpful macros for checking which C++ standard we are compiling with.
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//
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#if (__cplusplus >= 202002L)
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# define IMATH_CPLUSPLUS_VERSION 20
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#elif (__cplusplus >= 201703L)
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# define IMATH_CPLUSPLUS_VERSION 17
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#elif (__cplusplus >= 201402L) || (defined(_MSC_VER) && _MSC_VER >= 1914)
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# define IMATH_CPLUSPLUS_VERSION 14
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#elif (__cplusplus >= 201103L) || (defined(_MSC_VER) && _MSC_VER >= 1900)
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# define IMATH_CPLUSPLUS_VERSION 11
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#else
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# error "This version of Imath is meant to work only with C++11 and above"
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#endif
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//
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// Constexpr C++14 conditional definition
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//
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#if (IMATH_CPLUSPLUS_VERSION >= 14)
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#define IMATH_CONSTEXPR14 constexpr
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#else
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#define IMATH_CONSTEXPR14 /* can not be constexpr before c++14 */
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#endif
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#endif // __cplusplus
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#ifndef M_PI
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# define M_PI 3.14159265358979323846
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#endif
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#ifndef M_PI_2
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# define M_PI_2 1.57079632679489661923 // pi/2
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#endif
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//-----------------------------------------------------------------------------
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//
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// Some, but not all, C++ compilers support the C99 restrict
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// keyword or some variant of it, for example, __restrict.
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//
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//-----------------------------------------------------------------------------
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#if defined(__GNUC__) || defined(__clang__) || defined(_MSC_VER) || defined(__INTEL_COMPILER)
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# define IMATH_RESTRICT __restrict
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#else
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# define IMATH_RESTRICT
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#endif
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#ifdef __cplusplus
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IMATH_INTERNAL_NAMESPACE_HEADER_EXIT
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#endif // __cplusplus
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/// @endcond
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#endif // INCLUDED_IMATHPLATFORM_H
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