Calling it a hint is very much over-simplifying things as there are also restrictions on what a constexpr function is and is not allowed to do, although those restrictions become fewer and fewer as time goes on as compilers are so advanced that they can emulate more system level things at compile time.
Also, constexpr on a variable is not a hint - it must be evaluated at compile time, where-as a constexpr function will be evaluated at either compile time or runtime depending on the context and arguments passed to it. For a function that you either want to work at compile time or not at all (compile error), consteval is the hardened version.
Yes, sadly this means "constexpr" variables and "consteval" functions must be calculated at compile time, while "constexpr" functions can be used both at compile time and runtime. An annoying distinction.
Also, constexpr on a variable is not a hint - it must be evaluated at compile time, where-as a constexpr function will be evaluated at either compile time or runtime depending on the context and arguments passed to it. For a function that you either want to work at compile time or not at all (compile error), consteval is the hardened version.
Yes, sadly this means "constexpr" variables and "consteval" functions must be calculated at compile time, while "constexpr" functions can be used both at compile time and runtime. An annoying distinction.