Declaring a function constexpr makes it implicitly inline.
In that situation, explicitly using the inline keyword would be redundant, and might lead to confusion if it’s used in some cases but
not others. It’s better to simply omit it.
Noncompliant code example
inline constexpr int addOne(int n) { return n+1; } // Noncompliant
Compliant solution
constexpr int addOne(int n) { return n+1; }
