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208 lines
4.4 KiB
C++
208 lines
4.4 KiB
C++
//
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// FPEnvironment.h
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//
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// Library: Foundation
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// Package: Core
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// Module: FPEnvironment
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//
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// Definitions of class FPEnvironment.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_FPEnvironment_INCLUDED
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#define Foundation_FPEnvironment_INCLUDED
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#include "Poco/Foundation.h"
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#if defined(POCO_NO_FPENVIRONMENT)
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#include "Poco/FPEnvironment_DUMMY.h"
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#elif defined(__osf__)
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#include "Poco/FPEnvironment_DEC.h"
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#elif defined(sun) || defined(__sun)
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#include "Poco/FPEnvironment_SUN.h"
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#elif defined(__QNX__)
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#include "Poco/FPEnvironment_QNX.h"
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#elif defined(POCO_OS_FAMILY_UNIX)
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#include "Poco/FPEnvironment_C99.h"
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#elif defined(POCO_OS_FAMILY_WINDOWS)
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#include "Poco/FPEnvironment_WIN32.h"
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#else
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#include "Poco/FPEnvironment_DUMMY.h"
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#endif
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namespace Poco {
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class Foundation_API FPEnvironment: private FPEnvironmentImpl
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/// Instances of this class can be used to save
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/// and later restore the current floating
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/// point environment (consisting of rounding
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/// mode and floating-point flags).
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/// The class also provides various static
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/// methods to query certain properties
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/// of a floating-point number.
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{
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public:
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enum RoundingMode
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{
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FP_ROUND_DOWNWARD = FP_ROUND_DOWNWARD_IMPL,
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FP_ROUND_UPWARD = FP_ROUND_UPWARD_IMPL,
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FP_ROUND_TONEAREST = FP_ROUND_TONEAREST_IMPL,
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FP_ROUND_TOWARDZERO = FP_ROUND_TOWARDZERO_IMPL
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};
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enum Flag
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{
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FP_DIVIDE_BY_ZERO = FP_DIVIDE_BY_ZERO_IMPL,
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FP_INEXACT = FP_INEXACT_IMPL,
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FP_OVERFLOW = FP_OVERFLOW_IMPL,
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FP_UNDERFLOW = FP_UNDERFLOW_IMPL,
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FP_INVALID = FP_INVALID_IMPL
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};
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FPEnvironment();
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/// Standard constructor.
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/// Remembers the current environment.
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FPEnvironment(RoundingMode mode);
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/// Remembers the current environment and
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/// sets the given rounding mode.
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FPEnvironment(const FPEnvironment& env);
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/// Copy constructor.
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~FPEnvironment();
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/// Restores the previous environment (unless
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/// keepCurrent() has been called previously)
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FPEnvironment& operator = (const FPEnvironment& env);
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/// Assignment operator
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void keepCurrent();
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/// Keep the current environment even after
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/// destroying the FPEnvironment object.
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static void clearFlags();
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/// Resets all flags.
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static bool isFlag(Flag flag);
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/// Returns true iff the given flag is set.
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static void setRoundingMode(RoundingMode mode);
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/// Sets the rounding mode.
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static RoundingMode getRoundingMode();
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/// Returns the current rounding mode.
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static bool isInfinite(float value);
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static bool isInfinite(double value);
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static bool isInfinite(long double value);
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/// Returns true iff the given number is infinite.
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static bool isNaN(float value);
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static bool isNaN(double value);
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static bool isNaN(long double value);
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/// Returns true iff the given number is NaN.
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static float copySign(float target, float source);
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static double copySign(double target, double source);
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static long double copySign(long double target, long double source);
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/// Copies the sign from source to target.
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};
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//
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// For convenience, we provide a shorter name for
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// the FPEnvironment class.
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//
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typedef FPEnvironment FPE;
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//
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// inline's
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//
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inline bool FPEnvironment::isFlag(Flag flag)
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{
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return isFlagImpl(FlagImpl(flag));
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}
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inline void FPEnvironment::setRoundingMode(RoundingMode mode)
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{
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setRoundingModeImpl(RoundingModeImpl(mode));
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}
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inline FPEnvironment::RoundingMode FPEnvironment::getRoundingMode()
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{
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return RoundingMode(getRoundingModeImpl());
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}
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inline bool FPEnvironment::isInfinite(float value)
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{
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return isInfiniteImpl(value);
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}
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inline bool FPEnvironment::isInfinite(double value)
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{
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return isInfiniteImpl(value);
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}
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inline bool FPEnvironment::isInfinite(long double value)
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{
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return isInfiniteImpl(value);
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}
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inline bool FPEnvironment::isNaN(float value)
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{
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return isNaNImpl(value);
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}
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inline bool FPEnvironment::isNaN(double value)
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{
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return isNaNImpl(value);
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}
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inline bool FPEnvironment::isNaN(long double value)
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{
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return isNaNImpl(value);
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}
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inline float FPEnvironment::copySign(float target, float source)
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{
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return copySignImpl(target, source);
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}
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inline double FPEnvironment::copySign(double target, double source)
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{
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return copySignImpl(target, source);
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}
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inline long double FPEnvironment::copySign(long double target, long double source)
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{
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return copySignImpl(target, source);
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}
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} // namespace Poco
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#endif // Foundation_FPEnvironment_INCLUDED
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