Edward Welbourne b08368d99f Add qHypot() to qmath.h, exposing and extending std::hypot() ... We have plenty of places where we add some squares and take a square root; this may be done more accurately and faster by hypot(). Introduce QHypotHelper to handle hypot with more than 3 parameters, and with 3 when the C++17 version is missing (which it never should be). Include an overload taking arbitrarily many valus and ensure that we can use qHypot() with qfloat16. Illustrate with some example uses, add some tests. [ChangeLog][QtCore][QMath] Header <QMath> now provides qHypot(), an implementation of std::hypot() taking arbitrarily many numeric values, including support for qfloat16, while avoiding the overflow and underflow problems that arise when naively taking the square root of a sum of squares. Change-Id: Ia4e3913fe83fc27d17d8e7f1a52f03ad445c1fed Reviewed-by: Andrei Golubev <andrei.golubev@qt.io> Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>		2021-01-27 15:00:57 +01:00
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CMakeLists.txt	CMake: Regenerate projects to use new qt_internal_ API	2020-09-23 16:59:06 +02:00
tst_qmath.cpp	Add qHypot() to qmath.h, exposing and extending std::hypot()	2021-01-27 15:00:57 +01:00