libreoffice-dev-common 1:6.0.3-0ubuntu1 / usr / include / libreoffice / sal / mathconf.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#ifndef INCLUDED_SAL_MATHCONF_H
#define INCLUDED_SAL_MATHCONF_H

#include "osl/endian.h"

#include <float.h>

#if defined __sun
#include <ieeefp.h>
#endif /* __sun */

#if defined(__cplusplus) && ( defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L )
#include <cmath>
#endif

#if defined(IOS)
#if defined(__cplusplus)
#include <cmath>
#else
#include <math.h>
#endif
#endif

#if defined __cplusplus
extern "C" {
#endif /* __cplusplus */


/* Generally, the C standard guarantees that at program startup, "trapping or
   stopping (if supported) is disabled on all [floating-point] exceptions"
   (F.7.3/1 of the August 3, 1998 draft of C99), and that during program
   execution, "a programmer can safely assume default modes (or be unaware of
   them)" (7.6/2, footnote 161 of the August 3, 1998 draft of C99).  Reportedly,
   on Windows there are printer drivers that switch on exceptions.  To avoid
   problems, the SAL_MATH_FPEXCEPTIONS_OFF macro can be used to explicitly
   switch off exceptions (on Windows).
 */
#if defined(_WIN32)
#define SAL_MATH_FPEXCEPTIONS_OFF() _control87( _MCW_EM, _MCW_EM )
#else /* WNT */
#define SAL_MATH_FPEXCEPTIONS_OFF()
#endif /* WNT */


/* SAL_MATH_FINITE(d): test double d on INFINITY, NaN et al. */
#if !defined __sun && !defined ANDROID \
                     && defined(__cplusplus) \
                     && ( defined(__GXX_EXPERIMENTAL_CXX0X__) \
                          || __cplusplus >= 201103L \
                          || defined(IOS) )
#define SAL_MATH_FINITE(d) std::isfinite(d)
#elif defined( IOS )
#define SAL_MATH_FINITE(d) isfinite(d)
#elif defined( WNT)
#define SAL_MATH_FINITE(d) _finite(d)
#elif defined(ANDROID) || defined LINUX || defined UNX
#define SAL_MATH_FINITE(d) finite(d)
#else /* WNT, LINUX, UNX */
#error "SAL_MATH_FINITE not defined"
#endif /* WNT, LINUX, UNX */


/* This needs to be fixed for non--IEEE-754 platforms: */
#if 1 /* IEEE 754 supported */
#if defined OSL_BIGENDIAN

/* IEEE 754 double structures for BigEndian */
union sal_math_Double
{
    struct
    {
        unsigned sign         : 1;
        unsigned exponent     :11;
        unsigned fraction_hi  :20;
        unsigned fraction_lo  :32;
    } inf_parts;
    struct
    {
        unsigned sign         : 1;
        unsigned exponent     :11;
        unsigned qnan_bit     : 1;
        unsigned bits         :19;
        unsigned fraction_lo  :32;
    } nan_parts;
    struct
    {
        unsigned msw          :32;
        unsigned lsw          :32;
    } w32_parts;
    double value;
};

#elif defined OSL_LITENDIAN

/* IEEE 754 double structures for LittleEndian */
union sal_math_Double
{
    struct {
        unsigned fraction_lo  :32;
        unsigned fraction_hi  :20;
        unsigned exponent     :11;
        unsigned sign         : 1;
    } inf_parts;
    struct {
        unsigned fraction_lo  :32;
        unsigned bits         :19;
        unsigned qnan_bit     : 1;
        unsigned exponent     :11;
        unsigned sign         : 1;
    } nan_parts;
    struct
    {
        unsigned lsw          :32;
        unsigned msw          :32;
    } w32_parts;
    double value;
};

#else /* OSL_BIGENDIAN, OSL_LITENDIAN */

#error "neither OSL_BIGENDIAN nor OSL_LITENDIAN"

#endif /* OSL_BIGENDIAN, OSL_LITENDIAN */
#else /* IEEE 754 supported */

#error "don't know how to handle IEEE 754"

#endif /* IEEE 754 supported */


#if defined __cplusplus
}
#endif /* __cplusplus */

#endif /* INCLUDED_SAL_MATHCONF_H */

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