22 Containers library [containers]

22.2 Container requirements [container.requirements]

22.2.2 Container data races [container.requirements.dataraces]

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For purposes of avoiding data races, implementations shall consider the following functions to be const: begin, end, rbegin, rend, front, back, data, find, lower_­bound, upper_­bound, equal_­range, at and, except in associative or unordered associative containers, operator[].
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Notwithstanding [res.on.data.races], implementations are required to avoid data races when the contents of the contained object in different elements in the same container, excepting vector<bool>, are modified concurrently.
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[Note
:
For a vector<int> x with a size greater than one, x[1] = 5 and *x.begin() = 10 can be executed concurrently without a data race, but x[0] = 5 and *x.begin() = 10 executed concurrently may result in a data race.
As an exception to the general rule, for a vector<bool> y, y[0] = true may race with y[1] = true.
— end note
]