C ++ language support operator overloading relationships (<,>,> =, <=, ==), they can be used to compare the C ++ built-in data types.
A support overloading any relational operators, the relationship between the operator overloading may be used to compare an object class.
/*** overrealate.cpp ***/ #include<iostream> using namespace std; class Distance { private: int feet; int inches; public: Distance() { feet = 0; inches = 0; } Distance(int f,int i) { feet = f; inches = i; } void displayDistance() { cout << "F: " << feet << " I: " << inches << endl; } Distance operator- () { feet = -feet; inches = -inches; return Distance(feet,inches); } bool operator <(const Distance& d) { if(feet < d.feet) { return true; } if(feet == d.feet && inches < d.inches) { return true; } return false; } }; int main() { Distance D1(11,10), D2(5,11); if(D1 < D2) { cout << "D1 is less than D2 " << endl; } else { cout << "D2 is less than D1" << endl; } return 0; }
operation result:
exbot @ ubuntu: ~ / wangqinghe / C ++ / 20190808 $ ./overrelation
D2 is less than D1