source: NonGTP/OpenEXR/include/Imath/ImathPlatform.h @ 855

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// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
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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>

#if defined(PLATFORM_WINDOWS)
    #ifndef M_PI
        #define M_PI 3.14159265358979323846
    #endif
#endif

//-----------------------------------------------------------------------------
//
//    Fixes for the "restrict" keyword.  These #ifdef's for detecting 
//    compiler versions courtesy of Boost's select_compiler_config.hpp; 
//    here is the copyright notice for that file:
//
//    (C) Copyright Boost.org 2001. Permission to copy, use, modify, sell and
//    and distribute this software is granted provided this copyright notice
//    appears in all copies. This software is provided "as is" without express 
//    or implied warranty, and with no claim as to its suitability for any 
//    purpose.
//
//    Some compilers support "restrict", in which case we do nothing.
//    Other compilers support some variant of it (e.g. "__restrict").
//    If we don't know anything about the compiler, we define "restrict"
//    to be a no-op.
//
//-----------------------------------------------------------------------------

#if defined __GNUC__
    #if !defined(restrict)
        #define restrict __restrict
    #endif

#elif defined(__INTEL_COMPILER) || defined(__ICL) || defined(__ICC) || defined(__ECC)
    // supports restrict, do nothing.

#elif defined __sgi
    // supports restrict, do nothing.

#else
    #define restrict

#endif

#endif // INCLUDED_IMATHPLATFORM_H