C++ ::
/* :: is the scope resolution operator * * It allows to access objects outside of their scope, e.g to implement * a function of a class from outside the class */ class foo { // define class named foo public: foo(); // constructor void bar(); // function }; foo::foo() { // Implement the constructor from outside the class } void foo::bar() { // Implement bar from outside the class } void bar() { // Implement different bar which is not within the same scope }