Which is faster C++ String length() or size()?

Both have the same complexity: Constant.

From the N4431 working draft, §21.4.4

size_type size() const noexcept;

Returns: A count of the number of char-like objects currently in the string. Complexity: Constant time.

And

size_type length() const noexcept;

Returns: size().

[…] iterates through all the characters and counts the length […]

That’s C strings you’re thinking of.

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