C++优先级

C++ Operator Precedence

The following table lists the precedence(优先) and associativity(结合性) of C++ operators. Operators are listed top to bottom, in descending(下降的) precedence.

Precedence	Operator	Description	Associativity
1	::	Scope resolution	Left-to-right
2	a++ a--	Suffix/postfix increment and decrement
	type() type{}	Functional cast
	a()	Function call
	a[]	Subscript
	. ->	Member access
3	++a --a	Prefix increment and decrement	Right-to-left
	+a -a	Unary plus and minus
	! ~	Logical NOT and bitwise NOT
	(type)	C-style cast
	*a	Indirection (dereference)
	&a	Address-of
	sizeof	Size-of[note 1]
	new new[]	Dynamic memory allocation
	delete delete[]	Dynamic memory deallocation
4	.* ->*	Pointer-to-member	Left-to-right
5	a*b a/b a%b	Multiplication(乘法), pision, and remainder
6	a+b a-b	Addition and subtraction
7	<< >>	Bitwise left shift and right shift
8	< <=	For relational operators < and ≤ respectively
	> >=	For relational operators > and ≥ respectively
9	== !=	For relational operators = and ≠ respectively
10	a&b	Bitwise AND
11	^	Bitwise XOR (exclusive or)
12	|	Bitwise OR (inclusive or)
13	&&	Logical AND
14	||	Logical OR
15	a?b:c	Ternary conditional[note 2]	Right-to-left
	throw	throw operator
	=	Direct assignment (provided by default for C++ classes)
	+= -=	Compound assignment by sum and difference
	*= /= %=	Compound assignment by product, quotient, and remainder
	<<= >>=	Compound assignment by bitwise(按位) left shift and right shift
	&= ^= |=	Compound assignment by bitwise AND, XOR, and OR
16	,	Comma	Left-to-right