constexpr

Constant Expressions

You can define, with the keyword constexpr, an expression that can be evaluated at compile-time. constexpr can be used for variables, functions, and user-defined types. An expression that is evaluated at compile-time has a lot of advantages. A constant expression

• can be evaluated at compile-time.
• gives the compiler deep insight into the code.
• is implicitly thread-safe.

constexpr - Variables and Objects

If you declare a variable as constexpr, the compiler will evaluate them at compile-time. ...