Is std::cout thread safe for single output

Asked Jan 11 '23 at 06:32

Active Jan 11 '23 at 06:32

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Suppose there are several threads, each thread invokes

std::cout << 123;

for each statement, it should output 3 characters, '1', '2', and '3'. So does the C++ standard guarantees that the '1' '2' and '3' will not interleave? i.e., the system will not output the following result: 112233

Thanks

asked Jan 11 '23 at 06:32

Wei Li

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std::cout is threadsafe in the sense that it will not crash, but output can become mixed. – Pepijn Kramer Jan 11 '23 at 06:35
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FYI: [How to easily make std::cout thread-safe?](https://stackoverflow.com/a/26909227/7478597) – Scheff's Cat Jan 11 '23 at 06:36

Is std::cout thread safe for single output

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