Subscripting [] Operator Overloading in C++
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The subscript operator [] is normally used to access array elements. This operator can be overloaded to enhance the existing functionality of C++ arrays.
Following example explains how a subscript operator [] can be overloaded.
Live Demo#include <iostream> using namespace std; const int SIZE = 10; class safearay { private: int arr[SIZE]; public: safearay() { register int i; for(i = 0; i < SIZE; i++) { arr[i] = i; } } int &operator[](int i) { if( i > SIZE ) { cout << "Index out of bounds" <<endl; // return first element. return arr[0]; } return arr[i]; } }; int main() { safearay A; cout << "Value of A[2] : " << A[2] <<endl; cout << "Value of A[5] : " << A[5]<<endl; cout << "Value of A[12] : " << A[12]<<endl; return 0; }
When the above code is compiled and executed, it produces the following result −
Value of A[2] : 2 Value of A[5] : 5 Index out of bounds Value of A[12] : 0
cpp_overloading.htm
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