C++ Features in GCC 14 Upgrade:

• C++23 features: Adds support for std::generator to coroutines. Explicit object member functions (deducing this) is useful for implementing CRTP. New stacktrace library enabled by default. std::inout_ptr / std::out_ptr is available. Partial support for ranges::to and pipe support for user-defined range adaptors. New <print> header.
• C++20 features: Mostly implemented except for partial module support since GCC 11. For chrono, Calendar and Timezones are fully supported with parse and from_stream.
• C++26 features: Some support available already for a standard to be released in two years. GCC 14 brings more support for freestanding. User generated static_assert messages seems nice. C++26 is in early days and implementers should take time.