std::generate in C++
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.
// 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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