Things To Look Out For In Reviews

This page is a low-entry-bar staging area for potential project-wide guidelines. After each release, we should go over each of these and decide whether we keep them here, or, preferably, fold them into Review Policy, API Design Principles, Commit Policy, Qt Coding Style, Coding Conventions or a new or existing QUIP.

Newly-Added Things

When adding a new Thing, don't forget to provide rationale.

Public Headers

• Don't move code around when changing public headers. Prefer adding new keywords or attributes on a separate line. Rationale: moving code around makes API-change-reviews needlessly hard. Example: Bad: https://codereview.qt-project.org/c/qt/qtmultimedia/+/528314/1/src/multimedia/video/qvideoframe.h Good: https://codereview.qt-project.org/c/qt/qtbase/+/528393/2/src/corelib/kernel/qpointer.h#34

Enums

• add a trailing comma to end of enumerators if a line break follows. Rationale: prevents the previous line from needing to change when adding more. Example: https://codereview.qt-project.org/c/qt/qtremoteobjects/+/528328/comment/9b8677ff_4ce9831a/
• enums should either be scoped or have an explicit underlying type. Rationale: prevents the enum's underlying_type to change (which would be BiC). References: http://eel.is/c++draft/enum#dcl.enum-7.sentence-3, https://community.kde.org/Policies/Binary_Compatibility_Issues_With_C%2B%2B#The_Do's_and_Don'ts (Point 3)
• New enumerators should be documented as new for version VERSION with \value [since VERSION] See also qdoc's \value command

New Classes

• Make sure new (value) classes follow the draft value-class mechanics QUIP-22.
• Documentation:
  • Is the documentation for the class complete and in good shape (grammar, style, correctness)?
  • Is the class documented as new with \since?
  • Does the class provide a good overview section?
  • Is it properly linked from related API and overview documentation? In particular, check whether similar or related classes have any \ingroup commands and whether it makes sense the class should also have it!
  • Should the class be mentioned in the What's New in Qt 6 overview documentation?

Polymorphic Classes

• Make dtor out-of-line, even if empty (then =default it). Rationale: pins the vtable to a single TU (and prevents -Wweak-vtable warnings). References: https://bugreports.qt.io/browse/QTBUG-45582

Deprecated and Removed Things

• Does the documentation reflect the deprecation, and mention the version it is first deprecated for (see also qdoc's \deprecated command? Does it give the user a rationale, as well as a suggestion for alternatives?

Decided To Keep Here

(make a proper subsection grouping when moving stuff here)