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std::generate in C++ - GeeksforGeeks

Last Updated : 21 Jul, 2017

, 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.

// C++ program to demonstrate the use of std::generate
#include <iostream>
#include <vector>
#include <algorithm>

// Defining the generator function
int gen()
{
    static int i = 0;
    return ++i;
}

using namespace std;
int main()
{
    int i;

    // Declaring a vector of size 10
    vector<int> v1(10);

    // using std::generate
    std::generate(v1.begin(), v1.end(), gen);

    vector<int>::iterator i1;
    for (i1 = v1.begin(); i1 != v1.end(); ++i1) {
        cout << *i1 << " ";
    }
    return 0;
}

Output:

1 2 3 4 5 6 7 8 9 10

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