Consider the following code segment for a class named   vehicle: class vehicle {   private:     string type;     string model;     string color;     int numWheels;   public:     … }; Write the PROTOTYPE for a function that overloads the + (plus) operator to add two vehicle objects. This prototype would add the numWheels of the objects.  Write as a member Write the PROTOTYPE for a function that overloads the << (insertion) operator to print a vehicle object.

Operator overloading:

Operator overloading is giving new meaning or new definition to the existing operator but we cannot change the operator priority.

• It is a compile time polymorphism in which operator is overloaded.
• It simply means to do more than one task at a time on any operator.
• Operators that cannot be overloaded are,
• Scope resolution operator(::)
• sizeof()
• Ternary operator(?:)

Function prototype:·        

• The function prototype is used to declare a function.
• It does not include the body of the function and informs the compiler about the function's name and return type.
• The prototype specifies the list of arguments passed, if any, along with their data types.
• The compiler makes use of prototype information to ensure the presence of corresponding function definition and correctness of argument data types.
• In a function prototype, the name of the arguments is optional.
• It is always terminated with a semicolon, unlike function definition which does not have a semicolon at the end.

The prototype for a function that overloads the “+” operator is as follows,

vehicle operator + (vehicle const &v);