How can I initialize a mutable variable at compile time? [duplicate]

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
– 463035818_is_not_an_ai, Commented Jan 8, 2021 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
– Brian Bi, Commented Jan 8, 2021 at 15:59

Acorn · Accepted Answer · 2021-01-08 15:52:41Z

1

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

answered Jan 8, 2021 at 15:52

Acorn

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