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Functors in C++
The functors are the function objects in C++. The functor allows an instance object of some class to be called as if it were an ordinary function. Let us consider a function that takes one argument. We can use this function as function object to do some task on a set of data.
Example Code
#include <iostream> #include <algorithm> using namespace std; int square(int x) { return x*x; //return square of x } int main() { int data[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}; transform(data, data+10, data, square); for (int i = 0; i<10; i++) cout << data[i] << endl; }
Output
0 1 4 9 16 25 36 49 64 81
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