Overloadable Operators

---

Table 14.1 lists the overloadable operators. The right hand column gives an example prototype for one of the operators in the group for a user-defined type named Foo.

Table 14.1: Overloadable Operators

Operator Type	Operators	Example Prototype For Class Foo
Arithmetic (Additive & Multiplicative)	+, -, *, /, %	Foo& operator+(Foo& lhs, Foo& rhs);
Assignment	=	Foo& operator=(Foo& rhs);
Compound Assignment	*=, /=, %=, +=, -=, >>=, <<=, &=, ^=, |=	Foo& operator+=(Foo& rhs);
Relational	<, >, <=. >=,	bool operator<(Foo& rhs);
Logical	!, &&, ||	bool operator!(Foo& rhs);
Equality	==, !=	bool operator==(Foo& rhs);
Shift	<<, >>	Foo& operator<<(int shift_by);
Bitwise	&, |, ^	Foo& operator&(int mask_value);
Comma	,	Foo& operator,(Foo& rhs);
Pointer-to-Member	->, ->*	Foo* operator->();
IOStream Insertion & Extraction	<<, >>	iostream& operator<<(iostream& out, Foo&); iostream& operator>>(iostream& in, Foo&);
Increment & Decrement	++, --	Foo& operator++(); //postfix Foo& operator++(int); //prefix Foo& operator--(); //postfix Foo& operator--(int); //prefix
Function Call	()	Foo& operator()(int val1, int val2);
Subscript	[]	Foo& operator[](unsigned int);
Unary	*, &, +,-, !, ~	Foo& operator+();
Allocation & Deallocation	new, new[] delete, delete[]	Not covered in this chapter.

---