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[docs] Adjust qExchange() docs for the present, where C++17 is required [2/2]: 6.3+

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In C++17, std::exchange() is unconditionally available, so focus
attention on the missing constexpr and noexcept.

Manual conflict resolutions:
- docs moved from qglobal.cpp to qttypetraits.qdoc in 6.5

Change-Id: I5eb466b784bd741a7313a1554d8b7b67711d2cbc
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 9c1a00271bccd8cefa1a7e568e21debc429ad73a)
This commit is contained in:
Marc Mutz 2022-10-07 08:52:26 +02:00
parent abb629c023
commit 821b993857
1 changed files with 2 additions and 2 deletions
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src/corelib/global/qglobal.cpp
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@ -3811,9 +3811,9 @@ bool qunsetenv(const char *varName)
Replaces the value of \a obj with \a newValue and returns the old value of \a obj. Replaces the value of \a obj with \a newValue and returns the old value of \a obj.
This is Qt's implementation of std::exchange(). It differs from std::exchange() This is Qt's implementation of std::exchange(). It differs from std::exchange()
only in that it is \c constexpr already before C++20. only in that it is \c constexpr already before C++20 and noexcept already before C++23.
We strongly advise to use std::exchange() when you don't need the C++20 variant. We strongly advise to use std::exchange() when you don't need the C++20 or C++23 variants.
Here is how to use qExchange() to implement move constructors: Here is how to use qExchange() to implement move constructors:
\code \code