std::generate in C++ (original) (raw)

Last Updated : 21 Jul, 2017

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.Template function:

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.

CPP `

// C++ program to demonstrate the use of std::generate #include #include #include

// 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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