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The more context you can give a function, the better the chances that it can do something useful with the information. In particular, when you call a single function and pass it a pair of iterators first and last that delimit a range, it can perform optimizations based on knowing the number of objects that are going to be added, which it obtains by computing distance(first,last) .The same applies to "repeat n times" operations, such as the vector constructor that takes a repeat count and a value.
