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Extend qIsInf() and friends to handle integral types sensibly

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[ChangeLog][QtCore] qIsInf(), qIsNaN() and qIsFinite() now, like
std::isinf() and friends, accept integral types (returning false,
false and true, respectively) as well as floating-point ones.

Change-Id: I1e2b7f033f0e8166c0b21e31a62b3e6d37b9344a
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
This commit is contained in:
Edward Welbourne 2021-01-11 12:36:59 +01:00
parent 2f8428d332
commit b2a3389cfe
1 changed files with 14 additions and 1 deletions
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15
src/corelib/global/qnumeric.h
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@ -1,6 +1,6 @@
/****************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
@ -73,6 +73,18 @@
QT_BEGIN_NAMESPACE
// To match std::is{inf,nan,finite} functions:
template <typename T>
constexpr typename std::enable_if<std::is_integral<T>::value, bool>::type
qIsInf(T) { return false; }
template <typename T>
constexpr typename std::enable_if<std::is_integral<T>::value, bool>::type
qIsNaN(T) { return false; }
template <typename T>
constexpr typename std::enable_if<std::is_integral<T>::value, bool>::type
qIsFinite(T) { return true; }
// Floating-point types (see qfloat16.h for its overloads).
Q_CORE_EXPORT Q_DECL_CONST_FUNCTION bool qIsInf(double d);
Q_CORE_EXPORT Q_DECL_CONST_FUNCTION bool qIsNaN(double d);
Q_CORE_EXPORT Q_DECL_CONST_FUNCTION bool qIsFinite(double d);
@ -81,6 +93,7 @@ Q_CORE_EXPORT Q_DECL_CONST_FUNCTION bool qIsInf(float f);
Q_CORE_EXPORT Q_DECL_CONST_FUNCTION bool qIsNaN(float f);
Q_CORE_EXPORT Q_DECL_CONST_FUNCTION bool qIsFinite(float f);
Q_CORE_EXPORT Q_DECL_CONST_FUNCTION int qFpClassify(float val);
#if QT_CONFIG(signaling_nan)
Q_CORE_EXPORT Q_DECL_CONST_FUNCTION double qSNaN();
#endif