Possible mistake in quiz section on Atomics

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1

Question:
Which of the following is NOT an atomic operation?

Answer

operator++()

operator++() on an atomic variable is NOT atomic by default. You should use fetch_add(1) instead for atomic increment.isn’t this wrong?It is mentioned earlier in the article as well:

std::atomic<int> counter{0};

counter++; // Equivalent to fetch_add(1)

Also the following link from cppreference confirms it.

2

Yes, operator++ is atomic by default. I maybe meant to write that it is the most restrictive memory order. Thanks for pointing it out!