std::generate, as the name suggests is an STL algorithm, which is used to generate numbers based upon a generator function, and then, it assigns those values to the elements in the container in the range [first, last).
The generator function has to be defined by the user, and it is called successively for assigning the numbers.
void generate (ForwardIterator first, ForwardIterator last, Generator gen); first: Forward iterator pointing to the first element of the container. last: Forward iterator pointing to the last element of the container. gen: A generator function, based upon which values will be assigned. Returns: none Since, it has a void return type, so it does not return any value.
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