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Diffstat (limited to 'Source/OpenEXR/Imath/ImathLimits.h')
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diff --git a/Source/OpenEXR/Imath/ImathLimits.h b/Source/OpenEXR/Imath/ImathLimits.h new file mode 100644 index 0000000..0a67e5b --- /dev/null +++ b/Source/OpenEXR/Imath/ImathLimits.h @@ -0,0 +1,265 @@ +/////////////////////////////////////////////////////////////////////////// +// +// Copyright (c) 2002, 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, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +// +/////////////////////////////////////////////////////////////////////////// + + + +#ifndef INCLUDED_IMATHLIMITS_H +#define INCLUDED_IMATHLIMITS_H + +//---------------------------------------------------------------- +// +// Limitations of the basic C++ numerical data types +// +//---------------------------------------------------------------- + +#include <float.h> +#include <limits.h> + +//------------------------------------------ +// In Windows, min and max are macros. Yay. +//------------------------------------------ + +#if defined _WIN32 || defined _WIN64 + #ifdef min + #undef min + #endif + #ifdef max + #undef max + #endif +#endif + +namespace Imath { + + +//----------------------------------------------------------------- +// +// Template class limits<T> returns information about the limits +// of numerical data type T: +// +// min() largest possible negative value of type T +// +// max() largest possible positive value of type T +// +// smallest() smallest possible positive value of type T +// +// epsilon() smallest possible e of type T, for which +// 1 + e != 1 +// +// isIntegral() returns true if T is an integral type +// +// isSigned() returns true if T is signed +// +// Class limits<T> is useful to implement template classes or +// functions which depend on the limits of a numerical type +// which is not known in advance; for example: +// +// template <class T> max (T x[], int n) +// { +// T m = limits<T>::min(); +// +// for (int i = 0; i < n; i++) +// if (m < x[i]) +// m = x[i]; +// +// return m; +// } +// +// Class limits<T> has been implemented for the following types: +// +// char, signed char, unsigned char +// short, unsigned short +// int, unsigned int +// long, unsigned long +// float +// double +// long double +// +// Class limits<T> has only static member functions, all of which +// are implemented as inlines. No objects of type limits<T> are +// ever created. +// +//----------------------------------------------------------------- + + +template <class T> struct limits +{ + static T min(); + static T max(); + static T smallest(); + static T epsilon(); + static bool isIntegral(); + static bool isSigned(); +}; + + +//--------------- +// Implementation +//--------------- + +template <> +struct limits <char> +{ + static char min() {return CHAR_MIN;} + static char max() {return CHAR_MAX;} + static char smallest() {return 1;} + static char epsilon() {return 1;} + static bool isIntegral() {return true;} + static bool isSigned() {return (char) ~0 < 0;} +}; + +template <> +struct limits <signed char> +{ + static signed char min() {return SCHAR_MIN;} + static signed char max() {return SCHAR_MAX;} + static signed char smallest() {return 1;} + static signed char epsilon() {return 1;} + static bool isIntegral() {return true;} + static bool isSigned() {return true;} +}; + +template <> +struct limits <unsigned char> +{ + static unsigned char min() {return 0;} + static unsigned char max() {return UCHAR_MAX;} + static unsigned char smallest() {return 1;} + static unsigned char epsilon() {return 1;} + static bool isIntegral() {return true;} + static bool isSigned() {return false;} +}; + +template <> +struct limits <short> +{ + static short min() {return SHRT_MIN;} + static short max() {return SHRT_MAX;} + static short smallest() {return 1;} + static short epsilon() {return 1;} + static bool isIntegral() {return true;} + static bool isSigned() {return true;} +}; + +template <> +struct limits <unsigned short> +{ + static unsigned short min() {return 0;} + static unsigned short max() {return USHRT_MAX;} + static unsigned short smallest() {return 1;} + static unsigned short epsilon() {return 1;} + static bool isIntegral() {return true;} + static bool isSigned() {return false;} +}; + +template <> +struct limits <int> +{ + static int min() {return INT_MIN;} + static int max() {return INT_MAX;} + static int smallest() {return 1;} + static int epsilon() {return 1;} + static bool isIntegral() {return true;} + static bool isSigned() {return true;} +}; + +template <> +struct limits <unsigned int> +{ + static unsigned int min() {return 0;} + static unsigned int max() {return UINT_MAX;} + static unsigned int smallest() {return 1;} + static unsigned int epsilon() {return 1;} + static bool isIntegral() {return true;} + static bool isSigned() {return false;} +}; + +template <> +struct limits <long> +{ + static long min() {return LONG_MIN;} + static long max() {return LONG_MAX;} + static long smallest() {return 1;} + static long epsilon() {return 1;} + static bool isIntegral() {return true;} + static bool isSigned() {return true;} +}; + +template <> +struct limits <unsigned long> +{ + static unsigned long min() {return 0;} + static unsigned long max() {return ULONG_MAX;} + static unsigned long smallest() {return 1;} + static unsigned long epsilon() {return 1;} + static bool isIntegral() {return true;} + static bool isSigned() {return false;} +}; + +template <> +struct limits <float> +{ + static float min() {return -FLT_MAX;} + static float max() {return FLT_MAX;} + static float smallest() {return FLT_MIN;} + static float epsilon() {return FLT_EPSILON;} + static bool isIntegral() {return false;} + static bool isSigned() {return true;} +}; + +template <> +struct limits <double> +{ + static double min() {return -DBL_MAX;} + static double max() {return DBL_MAX;} + static double smallest() {return DBL_MIN;} + static double epsilon() {return DBL_EPSILON;} + static bool isIntegral() {return false;} + static bool isSigned() {return true;} +}; + +template <> +struct limits <long double> +{ + static long double min() {return -LDBL_MAX;} + static long double max() {return LDBL_MAX;} + static long double smallest() {return LDBL_MIN;} + static long double epsilon() {return LDBL_EPSILON;} + static bool isIntegral() {return false;} + static bool isSigned() {return true;} +}; + + +} // namespace Imath + +#endif |