diff options
author | Andreas Buhr <andreas.buhr@qt.io> | 2020-11-17 16:36:02 +0100 |
---|---|---|
committer | Andreas Buhr <andreas.buhr@qt.io> | 2020-11-30 23:11:04 +0100 |
commit | d545fbb61b699802e9ae1a3c19f4c4bef724fbda (patch) | |
tree | ed97737767218c020cb14f31d47840e8987d691e /src/corelib/global | |
parent | 6c442ddbf584413fa4228aae4cc277887344e20d (diff) |
Extend container overview documentation, mention Q_DECLARE_TYPEINFO
The container overview documentation did not mention
Q_DECLARE_TYPEINFO and the related optimizations. This patch
adds a short paragraph about it.
Task-number: QTBUG-86584
Pick-to: 6.0
Change-Id: I5b0b8ce92a47da5f0398cc413fbf3e07b0921e59
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Andrei Golubev <andrei.golubev@qt.io>
Diffstat (limited to 'src/corelib/global')
-rw-r--r-- | src/corelib/global/qglobal.cpp | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/src/corelib/global/qglobal.cpp b/src/corelib/global/qglobal.cpp index 62ca2ca8a1..bcfc6ada2e 100644 --- a/src/corelib/global/qglobal.cpp +++ b/src/corelib/global/qglobal.cpp @@ -3995,12 +3995,19 @@ bool qunsetenv(const char *varName) pattern still represents a valid object, and memcpy() can be used to create a valid independent copy of a QUuid object. - Example of a movable type: + Example of a relocatable type: \snippet code/src_corelib_global_qglobal.cpp 39 - Qt will try to detect the class of a type using std::is_trivial or - std::is_trivially_copyable. Use this macro to tune the behavior. + Qt will try to detect the class of a type using + \l {https://en.cppreference.com/w/cpp/types/is_trivial} {std::is_trivial_v<T>} + to indentify primitive + types and it will require both + \l {https://en.cppreference.com/w/cpp/types/is_trivially_copyable} {std::is_trivially_copyable_v<T>} + and + \l {https://en.cppreference.com/w/cpp/types/is_destructible} {std::is_trivially_destructible_v<T>} + to identify relocatable types. + Use this macro to tune the behavior. For instance many types would be candidates for Q_RELOCATABLE_TYPE despite not being trivially-copyable. */ |