Hot off the press from the latest ISO C++ meeting:

Trip report: June 2026 ISO C++ standards meeting (Brno, Czechia)

by Herb Sutter

From the article:

tl;dr… A few highlights

• Adopted this week in draft C++29: Complete catalog of all undefined behavior (UB) in C++. Contract pre/post support for virtual functions. Defaulting (=default) for postfix increment/decrement. Designated initializers for base classes. Python-style .lookup(key) for associative containers. And more…
• Other significant progress: Progress on various features targeting C++29, including systematically addressing UB and adding safety profiles for C++.
• Next six months: Telecon line-by-line review of a proposal to systematically address all undefined behavior in C++. Progress adding C++ memory safety subsetting profiles. Both aim for inclusion in C++29.