C++: int64_t where does it come from?

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I was wondering where types like int64_t come from. Are they c++ standard or os-dependent? (1)

Also, do you know where I can find documentation about these types? I couldn't find useful information so far. Do they have a special name? (2)

What's their general difference with regards to the standard primitive types like int,long... (3)

Thank you and Regards

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