Here’s the realistic timeline, and history is not encouraging. C++20 was ratified in 2020, and modules are still not fully usable in production five years later. C++23 had limited adoption by early 2025. C++26 gets ratified in 2026. Major compilers achieve reasonable conformance by 2027-2028. As of early 2025, no major compiler (GCC, Clang, MSVC) ships production-ready P2900 contracts support. Large codebases begin adopting C++26 features by 2029-2030. Profiles in C++29 won’t be ratified until 2029, with compiler support by 2030-2031 and real adoption by 2032-2033. And profiles have no working implementation — critics on the committee itself have questioned their feasibility.
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