opencv/3rdparty/openexr/Imath/ImathPlatform.h

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
//
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are
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///////////////////////////////////////////////////////////////////////////

#ifndef INCLUDED_IMATHPLATFORM_H
#define INCLUDED_IMATHPLATFORM_H

//----------------------------------------------------------------------------
//
//	ImathPlatform.h
//
//	This file contains functions and constants which aren't
//	provided by the system libraries, compilers, or includes on
//	certain platforms.
//
//----------------------------------------------------------------------------

#include <math.h>

#ifndef M_PI
    #define M_PI    3.14159265358979323846
#endif

#ifndef M_PI_2
    #define M_PI_2  1.57079632679489661923 // pi/2
#endif


//-----------------------------------------------------------------------------
//
//    Some, but not all, C++ compilers support the C99 restrict
//    keyword or some variant of it, for example, __restrict.
//
//-----------------------------------------------------------------------------

#if defined __GNUC__

    //
    // supports __restrict
    //

    #define IMATH_RESTRICT __restrict

#elif defined (__INTEL_COMPILER) || \
      defined(__ICL) || \
      defined(__ICC) || \
      defined(__ECC)

    //
    // supports restrict
    //

    #define IMATH_RESTRICT restrict

#elif defined __sgi

    //
    // supports restrict
    //

    #define IMATH_RESTRICT restrict

#elif defined _MSC_VER

    //
    // supports __restrict
    //

//    #define IMATH_RESTRICT __restrict
    #define IMATH_RESTRICT

#else

    //
    // restrict / __restrict not supported
    //

    #define IMATH_RESTRICT

#endif

#endif // INCLUDED_IMATHPLATFORM_H