At the time of writing, there is a new C standard in the making, informally referred to as the C23 or C2X. The standard will probably be published in 2024, with a working draft now available. Currently, we can install gcc version 13 or higher to try out some of the C23 features. We need to include the -std=c2x flag in the compilation string when targeting the C23 standard.
35.1 constexpr
Starting with C23, objects marked with constexpr are constants whose value is determined during the compilation time. ...
