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Asked: 2026-05-23T10:37:18+00:00

this is a beginner question i guess but i couldn’t find the answer to

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this is a beginner question i guess but i couldn’t find the answer to this particular question:

i have a standard (c++) vector v of size 10 and type int.

is it safe to have a thread alter all the even positions (v.at(0) = x; v.at(2) = y; etc.)
and another thread alter all the values for the odd positions (v.at(1) = a; v.at(3)=b;etc.) at the same time?

so, no changing of size, no push_back() etc. during the lifetime of these 2 threads.

if it is not safe, would the use of an array be a better way to do this?

thanks for your help.

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1 Answer

  1. Editorial Team

    vector does not provide any thread-safety guarantees, so technically the answer would be no.

    In practice, you should be able to get away with it… until the day that someone (possibly you) makes a small change in one corner of the program and all hell breaks loose. I wouldn’t feel comfortable doing this in any non-trivial program.

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