std::generate_n in C++
std::generate 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.
Now, there can be a scenario, where we want to assign values only to the first n elements, for that we have another STL algorithm std::generate_n, which has the following syntax:
OutputIterator generate_n (OutputIterator first, Size n, Generator gen); first: Output iterator pointing to the beginning of the container. n: No. of elements to be assigned a value, using generator function. gen: A generator function for generating the values. Returns: It doesnot have a void return type like std::generate, but, in fact, it returns an iterator pointing to the element that follows the last element whose value has been generated.
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