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std::generate in C++

std::generate_n in C++

Last Updated : 21 Jul, 2017

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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: Template function:

  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.

CPP

// C++ program to demonstrate the use of std::generate_n #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_n     std::generate_n(v1.begin(), 10, 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

std::generate in C++

M

Mrigendra Singh

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Article Tags :

C++
STL
cpp-algorithm-library

Practice Tags :

CPP
STL

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