When to use std::begin and std::end instead of container specific versions [duplicate]

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The free function version is more generic than the member function of the container. I would use it probably in generic code where the type of the container is not known before hand (and might be an array). In the rest of the code (i.e. when the container is fixed and known) I would probably use c.begin() due to inertia. I would expect new text books on C++ to recommend the free function version (as it is never worse and sometimes better), but that has to catch up with common usage.

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