aa30a2f97a
These options enable "strict ANSI" mode in MinGW which omits declarations of POSIX functions from the standard headers. To allow the library and, possibly even more importantly, the user code including our headers, to compile with these options, declare the functions that we need ourselves. This might appear to go against the spirit of "strict ANSI" mode, but the only alternative would be to not use such functions at all and silently cripple the library when -std=c++NN is used, compared to -std=g++NN case, and this doesn't seem appealing neither. Closes #16984.
170 lines
4.5 KiB
C++
170 lines
4.5 KiB
C++
/**
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* Name: wx/math.h
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* Purpose: Declarations/definitions of common math functions
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* Author: John Labenski and others
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* Modified by:
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* Created: 02/02/03
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* Copyright: (c) John Labenski
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* Licence: wxWindows licence
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*/
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/* THIS IS A C FILE, DON'T USE C++ FEATURES (IN PARTICULAR COMMENTS) IN IT */
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#ifndef _WX_MATH_H_
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#define _WX_MATH_H_
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#include "wx/defs.h"
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#include <math.h>
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#ifndef M_PI
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#define M_PI 3.1415926535897932384626433832795
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#endif
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/* Scaling factors for various unit conversions: 1 inch = 2.54 cm */
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#ifndef METRIC_CONVERSION_CONSTANT
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#define METRIC_CONVERSION_CONSTANT (1/25.4)
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#endif
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#ifndef mm2inches
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#define mm2inches (METRIC_CONVERSION_CONSTANT)
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#endif
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#ifndef inches2mm
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#define inches2mm (1/(mm2inches))
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#endif
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#ifndef mm2twips
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#define mm2twips (METRIC_CONVERSION_CONSTANT*1440)
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#endif
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#ifndef twips2mm
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#define twips2mm (1/(mm2twips))
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#endif
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#ifndef mm2pt
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#define mm2pt (METRIC_CONVERSION_CONSTANT*72)
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#endif
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#ifndef pt2mm
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#define pt2mm (1/(mm2pt))
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#endif
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#ifdef __cplusplus
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/* Any C++11 compiler should provide isfinite() */
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#if __cplusplus >= 201103
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#include <cmath>
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#define wxFinite(x) std::isfinite(x)
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#elif defined(__VISUALC__) || defined(__BORLANDC__) || defined(__WATCOMC__)
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#include <float.h>
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#define wxFinite(x) _finite(x)
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#elif defined(__MINGW64_TOOLCHAIN__) || defined(__clang__)
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/*
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add more compilers with C99 support here: using C99 isfinite() is
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preferable to using BSD-ish finite()
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*/
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#if defined(_GLIBCXX_CMATH) || defined(_LIBCPP_CMATH)
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// these <cmath> headers #undef isfinite
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#define wxFinite(x) std::isfinite(x)
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#else
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#define wxFinite(x) isfinite(x)
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#endif
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#elif defined(wxNEEDS_STRICT_ANSI_WORKAROUNDS)
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wxDECL_FOR_STRICT_MINGW32(int, _finite, (double));
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#define wxFinite(x) _finite(x)
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#elif ( defined(__GNUG__)||defined(__GNUWIN32__)||defined(__DJGPP__)|| \
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defined(__SGI_CC__)||defined(__SUNCC__)||defined(__XLC__)|| \
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defined(__HPUX__) ) && ( !defined(wxOSX_USE_IPHONE) || wxOSX_USE_IPHONE == 0 )
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#ifdef __SOLARIS__
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#include <ieeefp.h>
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#endif
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#define wxFinite(x) finite(x)
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#else
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#define wxFinite(x) ((x) == (x))
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#endif
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#if defined(__VISUALC__)||defined(__BORLAND__)
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#define wxIsNaN(x) _isnan(x)
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#elif defined(__GNUG__)||defined(__GNUWIN32__)||defined(__DJGPP__)|| \
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defined(__SGI_CC__)||defined(__SUNCC__)||defined(__XLC__)|| \
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defined(__HPUX__)
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#define wxIsNaN(x) isnan(x)
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#else
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#define wxIsNaN(x) ((x) != (x))
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#endif
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#ifdef __INTELC__
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inline bool wxIsSameDouble(double x, double y)
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{
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// VZ: this warning, given for operators==() and !=() is not wrong, as ==
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// shouldn't be used with doubles, but we get too many of them and
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// removing these operators is probably not a good idea
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//
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// Maybe we should always compare doubles up to some "epsilon" precision
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#pragma warning(push)
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// floating-point equality and inequality comparisons are unreliable
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#pragma warning(disable: 1572)
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return x == y;
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#pragma warning(pop)
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}
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#else /* !__INTELC__ */
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wxGCC_WARNING_SUPPRESS(float-equal)
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inline bool wxIsSameDouble(double x, double y) { return x == y; }
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wxGCC_WARNING_RESTORE(float-equal)
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#endif /* __INTELC__/!__INTELC__ */
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inline bool wxIsNullDouble(double x) { return wxIsSameDouble(x, 0.); }
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inline int wxRound(double x)
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{
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wxASSERT_MSG( x > INT_MIN - 0.5 && x < INT_MAX + 0.5,
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wxT("argument out of supported range") );
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#if defined(HAVE_ROUND)
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return int(round(x));
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#else
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return (int)(x < 0 ? x - 0.5 : x + 0.5);
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#endif
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}
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#endif /* __cplusplus */
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#if defined(__WINDOWS__) && !defined(__WXWINCE__)
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#define wxMulDivInt32( a , b , c ) ::MulDiv( a , b , c )
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#else
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#define wxMulDivInt32( a , b , c ) (wxRound((a)*(((wxDouble)b)/((wxDouble)c))))
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#endif
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#if wxUSE_APPLE_IEEE
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* functions from common/extended.c */
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WXDLLIMPEXP_BASE wxFloat64 wxConvertFromIeeeExtended(const wxInt8 *bytes);
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WXDLLIMPEXP_BASE void wxConvertToIeeeExtended(wxFloat64 num, wxInt8 *bytes);
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/* use wxConvertFromIeeeExtended() and wxConvertToIeeeExtended() instead */
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#if WXWIN_COMPATIBILITY_2_8
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wxDEPRECATED( WXDLLIMPEXP_BASE wxFloat64 ConvertFromIeeeExtended(const wxInt8 *bytes) );
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wxDEPRECATED( WXDLLIMPEXP_BASE void ConvertToIeeeExtended(wxFloat64 num, wxInt8 *bytes) );
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* wxUSE_APPLE_IEEE */
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#endif /* _WX_MATH_H_ */
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