The ISO C++ committee completed its first C++29 meeting in Brno, Czechia. Key features adopted into draft C++29 include: a complete catalog of all undefined behavior (UB) in C++, contract pre/post support for virtual functions, =default for postfix increment/decrement operators, designated initializers for base classes, and Python-style .lookup(key) for associative containers. On the library side, constexpr pointer tagging and mandatory intptr_t/uintptr_t support were also adopted. Significant progress was made on memory safety work, including plans for a systematic line-by-line review of all UB cases targeting C++29, and a Profiles specification to enforce memory-safe subsets of C++. The next full meeting is scheduled for Búzios, Brazil in November.
