I have multithreads program that each thread will return a string and then it will store in a shared vector container. I wonder is it possible for a std::vector to handle this case or I have to use locks to protect it?
No. Barring a handful of methods, only const methods are concurrency safe.
(those exceptions are iterator getting/index access methods)
If any thread does such non-const access, no other thread may do any access at all.
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