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[docs] Add QSpan details to overview of C++20 features

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Document that QSpan exists because we cannot use std::span, and
explicitly point to the differences between QSpan and std::span.

Task-number: QTBUG-128837
Pick-to: 6.9 6.8
Change-Id: I54f406e3306ee1da136107323887f0c87f94ff9b
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
This commit is contained in:
Ivan Solovev 2024-11-22 16:24:03 +01:00 committed by Marc Mutz
parent 0ace5ba035
commit 083ebfa1a5
1 changed files with 16 additions and 0 deletions
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src/corelib/doc/src/cpp20-overview.qdoc
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@ -40,4 +40,20 @@
facilities in place of platform-specific backends to access timezone facilities in place of platform-specific backends to access timezone
information. This remains experimental in Qt 6.9 as some standard library information. This remains experimental in Qt 6.9 as some standard library
implementations do not faithfully represent the IANA data for timezones. implementations do not faithfully represent the IANA data for timezones.
\section1 QSpan - a Qt version of \c {std::span}
The \l {https://en.cppreference.com/w/cpp/container/span}{std::span} class
template is an addition to the standard library that provides a uniform
way to access a contiguous portion of any contiguous container.
Using \c {std::span} in the public APIs of Qt could provide significant
advantages. However, Qt 6 only requires C++17, meaning it cannot have C++20
types in the API and ABI.
Qt 6.7 introduced \l QSpan - a Qt version of \c {std::span}. The API of the
class is compatible with the std version. \l QSpan and \c {std::span} can be
implicitly converted into each other. However, there are some differences
between the classes. See the corresponding section in the
\l {span-STL} {QSpan class documentation} for more details.
*/ */