C++ 的运算符

 

Precedence	Operator	Description	Example	Overloadable	Associativity
1	::	Scope resolution operator	Class::age = 2;	no	none
2	() () [] -> . ++ -- const_cast dynamic_cast static_cast reinterpret_cast typeid	Function call Member initalization Array access Member access from a pointer Member access from an object Post-increment Post-decrement Special cast Special cast Special cast Special cast Runtime type information	isdigit('1') c_tor(int x, int y) : _x(x), _y(y*10){}; array[4] = 2; ptr->age = 34; obj.age = 34; for( int i = 0; i < 10; i++ ) cout << i; for( int i = 10; i > 0; i-- ) cout << i; const_cast<type_to>(type_from); dynamic_cast<type_to>(type_from); static_cast<type_to>(type_from); reinterpret_cast<type_to>(type_from); cout « typeid(type).name();	yes yes yes yes no yes yes no no no no no	left to right
3	! not ~ compl ++ -- - + * & new new [] delete delete [] (type) sizeof	Logical negation Alternate spelling for ! Bitwise complement Alternate spelling for ~ Pre-increment Pre-decrement Unary minus Unary plus Dereference Address of Dynamic memory allocation Dynamic memory allocation of array Deallocating the memory Deallocating the memory of array Cast to a given type Return size of an object or type	if( !done ) … flags = ~flags; for( i = 0; i < 10; ++i ) cout << i; for( i = 10; i > 0; --i ) cout << i; int i = -1; int i = +1; int data = *intPtr; int *intPtr = &data; long *pVar = new long; MyClass *ptr = new MyClass(args); delete pVar; delete [] array; int i = (int) floatNum;//int size = sizeof(float);	yes yes yes yes yes yes yes yes yes yes yes yes yes no	right to left
4	->* .*	Member pointer selector Member object selector	ptr->*var = 24; obj.*var = 24;	yes no	left to right
5	* / %	Multiplication Division Modulus	int i = 2 * 4; float f = 10.0 / 3.0; int rem = 4 % 3;	yes yes yes	left to right
6	+ -	Addition Subtraction	int i = 2 + 3; int i = 5 - 1;	yes yes	left to right
7	<< >>	Bitwise shift left Bitwise shift right	int flags = 33 << 1; int flags = 33 >> 1;	yes yes	left to right
8	< <= > >=	Comparison less-than Comparison less-than-or-equal-to Comparison greater-than Comparison greater-than-or-equal-to	if( i < 42 ) … if( i <= 42 ) ... if( i > 42 ) … if( i >= 42 ) ...	yes yes yes yes	left to right
9	== eq != not_eq	Comparison equal-to Alternate spelling for == Comparison not-equal-to Alternate spelling for !=	if( i == 42 ) ... if( i != 42 ) …	yes - yes	left to right
10	& bitand	Bitwise AND Alternate spelling for &	flags = flags & 42;	yes	left to right
11	^ xor	Bitwise exclusive OR (XOR) Alternate spelling for ^	flags = flags ^ 42;	yes	left to right
12	| bitor	Bitwise inclusive (normal) OR Alternate spelling for |	flags = flags | 42;	yes	left to right
13	&& and	Logical AND Alternate spelling for &&	if( conditionA && conditionB ) …	yes	left to right
14	|| or	Logical OR Alternate spelling for ||	if( conditionA || conditionB ) ...	yes	left to right
15	? :	Ternary conditional (if-then-else)	int i = (a > b) ? a : b;	no	right to left
16	= += -= *= /= %= &= and_eq ^= xor_eq |= or_eq <<= >>=	Assignment operator Increment and assign Decrement and assign Multiply and assign Divide and assign Modulo and assign Bitwise AND and assign Alternate spelling for &= Bitwise exclusive or (XOR) and assign Alternate spelling for ^= Bitwise normal OR and assign Alternate spelling for |= Bitwise shift left and assign Bitwise shift right and assign	int a = b; a += 3; b -= 4; a *= 5; a /= 2; a %= 3; flags &= new_flags; flags ^= new_flags; flags |= new_flags; flags <<= 2; flags >>= 2;	yes yes yes yes yes yes yes yes yes yes yes	right to left
17	throw	throw exception	throw EClass(“Message”);	no
18	,	Sequential evaluation operator	for( i = 0, j = 0; i < 10; i++, j++ ) …	yes	left to right