Programmatically determine if std::string uses Copy-On-Write (COW) mechanism

Question

Following up on the discussion from this question, I was wondering how does one using native C++ determine programmatically whether or not the std::string implementation they ar

Answer 1

Using &s1[0] to take the adress is not what you want, [0] returns a writable reference and will create a copy.

Use data() instead, it returns a const char*, and your tests may pass.