How can I initialize a mutable variable at compile time?

Question

I can initialize a variable at compile time using constexpr, but this makes the variable immutable (i.e. const).

I want a variable that is guaranteed to be initialized at compile time, but that I can still mutate/modify at run-time.

maybe clarify, what code would you like to write but cannot? — 463035818_is_not_an_ai, Jan 08 '21 at 15:52
Worth noting, although `constinit` exists in C++20, it can only be applied to static and thread-local objects. Its main purpose is to prevent the static initialization order fiasco, not to provide a "compile-time constant but mutable" variable. The latter concept is not that useful, but if you really need it, it can be emulated by making a non-`const` copy of a `constexpr` variable. — Brian Bi, Jan 08 '21 at 15:59

score 1 · Accepted Answer · answered Jan 08 '21 at 15:52

1

i think there should be non const and compile time evaluated variable.

answered Jan 08 '21 at 15:52

Acorn

1 Answers1