Is std::string Always Null-Terminated in C 11?

Is std::string Null-Terminated in C 11?

In 2008, Herb Sutter proposed tightening string implementation in C 0x to require null-termination. However, the C 11 standard includes a different approach:

Yes, std::string is always null-terminated in C 11.

The standard specifies that the pointer returned by std::basic_string::c_str() will be equal to the address of the initial character in the string (&s[0]). Therefore, it is safe to use &str[0] in C 11.

Consequences:

• Using &str[0] now provides a safe and efficient way to access underlying string characters.
• The guarantee of null-termination simplifies interoperability with C-style APIs and data structures.
• However, this does not imply that std::string is a copy-on-write implementation. The implementation may still choose to optimize performance through copy-on-write or other strategies that preserve null-termination.

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