I support the switch On Sun, 4 Dec 2022 at 16:18, Alex Rousskov <rouss...@measurement-factory.com> wrote:
> Hello, > > I propose that we switch master/v6 from C++11 to C++17: Modern > environments support C++17 well. We are wasting significant amounts of > time on emulating such basic C++17 features as std::optional. We are > writing worse code than we can because we lack access to such basic > C++14 and C++17 features as > > * function return type deduction (auto) > * generic lambdas (auto arguments) > * relaxed constexpr restrictions > * std::make_unique > * std::integer_sequence > * std::quoted > * Nested namespace definitions > * [[fallthrough]], [[maybe_unused]], and [[nodiscard]] > * fold expressions > * auto [a, b] = getTwoReturnValues(); > * inline variables > * std::any > * std::variant > * std::byte > > If we do not switch now, then we would have to wait about a year for the > next such opportunity because we should not introduce such a big > difference between master and the upcoming unstable v6 branch. > > > C++17 is supported by popular modern compilers and stable distros. Squid > master branch should target those IMO. Even old environments can install > the necessary modern compilers (e.g., RHEL5 users can get them via Red > Hat Developer Toolset). > > * GCC v5 supports most C++17 features. > * GCC v8 supports all relevant C++17 features. > * Clang v5 supports nearly all C++17 features. > * Clang v8 supports all relevant C++17 features. > > * Ubuntu 20.04 LTS ships with GCC v9 and clang v10. > > * https://gcc.gnu.org/projects/cxx-status.html#cxx17 > * > https://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2017 > * https://clang.llvm.org/cxx_status.html#cxx17 > * https://en.cppreference.com/w/cpp/compiler_support/17 > > > Switching to just C++14 would be better than nothing, but it will not > give us several C++17 features that we already waste serious time on > emulating/avoiding (e.g., std::optional). We should not switch to C++20 > yet because modern stable compilers still have some C++20 support holes. > > > I can volunteer the corresponding PR. > > > Any objections to switching master/v6 to C++17? > > > Thank you, > > Alex. > _______________________________________________ > squid-dev mailing list > squid-dev@lists.squid-cache.org > http://lists.squid-cache.org/listinfo/squid-dev > -- @mobile
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