C++运算符优先级以及可否重载
2012-09-03 11:12
387 查看
C++运算符优先级
Operator | Description | Example | Overloadable |
Group 1 (no associativity) | |||
:: | Scope resolution operator | Class::age = 2; | NO |
Group 2 | |||
() | Function call | isdigit('1') | YES |
() | Member initalization | c_tor(int x, int y) : _x(x), _y(y*10){}; | YES |
[] | Array access | array[4] = 2; | YES |
-> | Member access from a pointer | ptr->age = 34; | YES |
. | Member access from an object | obj.age = 34; | NO |
++ | Post-increment | for( int i = 0; i < 10; i++ ) cout << i; | YES |
-- | Post-decrement | for( int i = 10; i > 0; i-- ) cout << i; | YES |
const_cast | Special cast | const_cast<type_to>(type_from); | NO |
dynamic_cast | Special cast | dynamic_cast<type_to>(type_from); | NO |
static_cast | Special cast | static_cast<type_to>(type_from); | NO |
reinterpret_cast | Special cast | reinterpret_cast<type_to>(type_from); | NO |
typeid | Runtime type information | cout « typeid(var).name(); cout « typeid(type).name(); | NO |
Group 3 (right-to-left associativity) | |||
! | Logical negation | if( !done ) … | YES |
not | Alternate spelling for ! | ||
~ | Bitwise complement | flags = ~flags; | YES |
compl | Alternate spelling for ~ | ||
++ | Pre-increment | for( i = 0; i < 10; ++i ) cout << i; | YES |
-- | Pre-decrement | for( i = 10; i > 0; --i ) cout << i; | YES |
- | Unary minus | int i = -1; | YES |
+ | Unary plus | int i = +1; | YES |
* | Dereference | int data = *intPtr; | YES |
& | Address of | int *intPtr = &data; | YES |
new | Dynamic memory allocation | long *pVar = new long; MyClass *ptr = new MyClass(args); | YES |
new [] | Dynamic memory allocation of array | long *array = new long ; | YES |
delete | Deallocating the memory | delete pVar; | YES |
delete [] | Deallocating the memory of array | delete [] array; | YES |
(type) | Cast to a given type | int i = (int) floatNum; | YES |
sizeof | Return size of an object or type | int size = sizeof floatNum; int size = sizeof(float); | NO |
Group 4 | |||
->* | Member pointer selector | ptr->*var = 24; | YES |
.* | Member object selector | obj.*var = 24; | NO |
Group 5 | |||
* | Multiplication | int i = 2 * 4; | YES |
/ | Division | float f = 10.0 / 3.0; | YES |
% | Modulus | int rem = 4 % 3; | YES |
Group 6 | |||
+ | Addition | int i = 2 + 3; | YES |
- | Subtraction | int i = 5 - 1; | YES |
Group 7 | |||
<< | Bitwise shift left | int flags = 33 << 1; | YES |
>> | Bitwise shift right | int flags = 33 >> 1; | YES |
Group 8 | |||
< | Comparison less-than | if( i < 42 ) … | YES |
<= | Comparison less-than-or-equal-to | if( i <= 42 ) ... | YES |
> | Comparison greater-than | if( i > 42 ) … | YES |
>= | Comparison greater-than-or-equal-to | if( i >= 42 ) ... | YES |
Group 9 | |||
== | Comparison equal-to | if( i == 42 ) ... | YES |
eq | Alternate spelling for == | ||
!= | Comparison not-equal-to | if( i != 42 ) … | YES |
not_eq | Alternate spelling for != | ||
Group 10 | |||
& | Bitwise AND | flags = flags & 42; | YES |
bitand | Alternate spelling for & | ||
Group 11 | |||
^ | Bitwise exclusive OR (XOR) | flags = flags ^ 42; | YES |
xor | Alternate spelling for ^ | ||
Group 12 | |||
| | Bitwise inclusive (normal) OR | flags = flags | 42; | YES |
bitor | Alternate spelling for | | ||
Group 13 | |||
&& | Logical AND | if( conditionA && conditionB ) … | YES |
and | Alternate spelling for && | ||
Group 14 | |||
|| | Logical OR | if( conditionA || conditionB ) ... | YES |
or | Alternate spelling for || | ||
Group 15 (right-to-left associativity) | |||
? : | Ternary conditional (if-then-else) | int i = (a > b) ? a : b; | NO |
Group 16 (right-to-left associativity) | |||
= | Assignment operator | int a = b; | YES |
+= | Increment and assign | a += 3; | YES |
-= | Decrement and assign | b -= 4; | YES |
*= | Multiply and assign | a *= 5; | YES |
/= | Divide and assign | a /= 2; | YES |
%= | Modulo and assign | a %= 3; | YES |
&= | Bitwise AND and assign | flags &= new_flags; | YES |
and_eq | Alternate spelling for &= | ||
^= | Bitwise exclusive or (XOR) and assign | flags ^= new_flags; | YES |
xor_eq | Alternate spelling for ^= | ||
|= | Bitwise normal OR and assign | flags |= new_flags; | YES |
or_eq | Alternate spelling for |= | ||
<<= | Bitwise shift left and assign | flags <<= 2; | YES |
>>= | Bitwise shift right and assign | flags >>= 2; | YES |
Group 17 | |||
throw | throw exception | throw EClass(“Message”); | NO |
Group 18 | |||
, | Sequential evaluation operator | for( i = 0, j = 0; i < 10; i++, j++ ) … | YES |
相关文章推荐
- C++运算符能否重载以及优先级问题
- C++运算符重载以及友元
- C++普通函数与模板函数以及特化函数重载的优先级问题
- C++运算符重载(成员函数以及友元函数实现)
- c++运算符重载以及一些基本概念
- [置顶] # c++运算符重载之 前置++, 后置++, 负号运算符, 类型转换函数, 以及输入输出运算符
- C++运算符重载(成员函数以及友元函数实现)
- C++运算符重载(成员函数以及友元函数实现)
- c++运算符重载中的两种形式以及常引用的使用
- C++运算符优先级
- CSS的三种样式以及他们的优先级
- 堆排序以及最大优先级队列
- 舞蹈课 (C++堆的优先级与重载)
- C++运算符重载探讨
- C++运算符重载(5) - explicit关键字的使用
- [Java]重载,重写以及继承,多态的区别
- C++运算符重载(10) - 智能指针
- Spring 之通知的类型以及切面的优先级
- C++运算符重载讲解与经典实例
- CSS从基础到熟练学习笔记(一)引入CSS样式的三种方式以及多种样式的优先级