title=C++ Programming: Language Default Operators

Table of operators

Operators in the same group have the same precedence and the order of evaluation is decided by the associativity (left-to-right or right-to-left). Operators in a preceding group have higher precedence than those in a subsequent group.

Operators	Description	Example Usage	Associativity
Scope Resolution Operator			—
::	unary scope resolution operator for globals	::NUM_ELEMENTS
::	binary scope resolution operator for class and namespace members	std::cout
Function Call, Member Access, Post-Increment/Decrement Operators, RTTI and C++ Casts			Left to right
()	function call operator	swap (x, y)
[]	array index operator	arr [i]
.	member access operator for an object of class/union type or a reference to it	obj.member
->	member access operator for a pointer to an object of class/union type	ptr->member
++ --	post-increment/decrement operators	num++
typeid()	run time type identification operator for an object or type	typeid (std::cout) typeid (std::iostream)
static_cast<>() dynamic_cast<>() const_cast<>() reinterpret_cast<>()	C++ style cast operators for compile-time type conversion See Type Casting for more info	static_cast<float> (i) dynamic_cast<std::istream> (stream) const_cast<char*> ("Hello, World!") reinterpret_cast<const long*> ("C++")
type()	functional cast operator (static_cast is preferred for conversion to a primitive type)	float (i)
	also used as a constructor call for creating a temporary object, esp. of a class type	std::string ("Hello, world!", 0, 5)
Unary Operators			Right to left
!, not	logical not operator	!eof_reached
~, compl	bitwise not operator	~mask
+ -	unary plus/minus operators	-num
++ --	pre-increment/decrement operators	++num
&, bitand	address-of operator	&data
*	indirection operator	*ptr
new new[] new() new()[]	new operators for single objects or arrays	new std::string (5, '*') new int [100] new (raw_mem) int new (arg1, arg2) int [100]
delete delete[]	delete operator for pointers to single objects or arrays	delete ptr delete[] arr
sizeof sizeof()	sizeof operator for expressions or types	sizeof 123 sizeof (int)
(type)	C-style cast operator (deprecated)	(float)i
Member Pointer Operators			Right to left
.*	member pointer access operator for an object of class/union type or a reference to it	obj.*memptr
->*	member pointer access operator for a pointer to an object of class/union type	ptr->*memptr
Multiplicative Operators			Left to right
* / %	multiplication, division and modulus operators	celsius_diff * 9 / 5
Additive Operators			Left to right
+ -	addition and subtraction operators	end - start + 1
Bitwise Shift Operators			Left to right
<< >>	left and right shift operators	bits << shift_len bits >> shift_len
Relational Inequality Operators			Left to right
< > <= >=	less-than, greater-than, less-than or equal-to, greater-than or equal-to	i < num_elements
Relational Equality Operators			Left to right
== !=, not_eq	equal-to, not-equal-to	choice != 'n'
Bitwise And Operator			Left to right
&, bitand		bits & clear_mask_complement
Bitwise Xor Operator			Left to right
^, xor		bits ^ invert_mask
Bitwise Or Operator			Left to right
|, bitor		bits | set_mask
Logical And Operator			Left to right
&&, and		arr != 0 && arr->len != 0
Logical Or Operator			Left to right
||, or		arr == 0 || arr->len == 0
Conditional Operator			Right to left
?:		size >= 0 ? size : 0
Assignment Operators			Right to left
=	assignment operator	i = 0
+= -= *= /= %= &=, and_eq |=, or_eq ^=, xor_eq <<= >>=	shorthand assignment operators (foo op= bar represents foo = foo op bar)	num /= 10
Exceptions			—
throw		throw "Array index out of bounds"
Comma Operator			Left to right
,		i = 0, j = i + 1, k = 0