Ways to distinguish string literal and runtime generated string?

No, a string literal like "foo" has the type const charS + 1 where S is the number of characters you wrote. It behaves like an array of that type with no special rules.

While I haven't tested this, I think if you just declare the function constexpr and compile with high optimization, the compiler will compute at compile time whenever possible. As a bonus, you don't need to write the code twice. On the other hand, you have to write it once in constexpr style.

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