# Changelog A revision of the guide is named by its date. A change that requires existing code to change says so. ## Unreleased The guide covers C++17 as well as C++20. A project picks one; C++20 stays the default, and C++17 is for libraries meant for other people's projects. [Section 5.13](Guide/LANGUAGE.md#513-c17-projects) lists the C++17 form of each C++20 feature the guide uses. Existing C++20 projects need no change. ## 2026-10-18 The first revision of Progmasoft C++ Style. It writes down the conventions of the Progmasoft C++ projects and decides what they left open: - thirteen chapters, from principles to tooling, with the `.clang-format` and `.clang-tidy` profiles and the compiler flags in full; - guidance for adopting the guide and recording a project's deviations; - the text under CC BY 4.0, the configuration and code examples under CC0 1.0.