how does the stl’s multimap insert respect orderings?

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It seems the new standard (C++11) changed this:

The order of the key-value pairs whose keys compare equivalent is the order of insertion and does not change.[cppreference]

I’m hesitating to use it though, as this seems like a detail easily overlooked when modifying the standard library to be C++11 compliant and it’s the sort of detail that will silently cause errors if your compiler’s library failed to implement properly.

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