C++ Operator Precedence
De cppreference.com
A tabela a seguir mostra a precedência ea associatividade dos operadores C + +. Operadores são listados de cima para baixo, em ordem decrescente de precedência.
Original:
The following table lists the precedence and associativity of C++ operators. Operators are listed top to bottom, in descending precedence.
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| Precedence | Operator | Description | Associativity |
|---|---|---|---|
| 1 | ::
|
Scope resolution | Left-to-right |
| 2 | ++ --
|
Suffix/postfix increment and decrement | |
()
|
Function call | ||
[]
|
Array subscripting | ||
.
|
Element selection by reference | ||
−>
|
Element selection through pointer | ||
| 3 | ++ --
|
Prefix increment and decrement | Right-to-left |
+ −
|
Unary plus and minus | ||
! ~
|
Logical NOT and bitwise NOT | ||
(type)
|
Type cast | ||
*
|
Indirection (dereference) | ||
&
|
Address-of | ||
sizeof
|
Size-of | ||
new, new[]
|
Dynamic memory allocation | ||
delete, delete[]
|
Dynamic memory deallocation | ||
| 4 | .* ->*
|
Pointer to member | Left-to-right |
| 5 | * / %
|
Multiplication, division, and remainder | |
| 6 | + −
|
Addition and subtraction | |
| 7 | << >>
|
Bitwise left shift and right shift | |
| 8 | < <=
|
For relational operators < and ≤ respectively | |
> >=
|
For relational operators > and ≥ respectively | ||
| 9 | == !=
|
For relational = and ≠ respectively | |
| 10 | &
|
Bitwise AND | |
| 11 | ^
|
Bitwise XOR (exclusive or) | |
| 12 | |
|
Bitwise OR (inclusive or) | |
| 13 | &&
|
Logical AND | |
| 14 | ||
|
Logical OR | |
| 15 | ?:
|
Ternary conditional | Right-to-left |
=
|
Direct assignment (provided by default for C++ classes) | ||
+= −=
|
Assignment by sum and difference | ||
*= /= %=
|
Assignment by product, quotient, and remainder | ||
<<= >>=
|
Assignment by bitwise left shift and right shift | ||
&= ^= |=
|
Assignment by bitwise AND, XOR, and OR | ||
| 16 | throw
|
Throw operator (for exceptions) | |
| 17 | ,
|
Comma | Left-to-right |
Ao analisar uma expressão, um operador que está listado em alguma linha será obrigado apertado (como se por parênteses) para os seus argumentos do que qualquer operador que está listado em uma linha mais abaixo. Por exemplo, as expressões e
std::cout<<a&b *p++ são analisados como (std::cout<<a)&b e *(p++), e não como std::cout<<(a&b) ou (*p)++.Original:
When parsing an expression, an operator which is listed on some row will be bound tighter (as if by parentheses) to its arguments than any operator that is listed on a row further below it. For example, the expressions
std::cout<<a&b and *p++ are parsed as (std::cout<<a)&b and *(p++), and not as std::cout<<(a&b) or (*p)++.The text has been machine-translated via Google Translate.
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Os operadores que estão na mesma célula (pode haver diversas fileiras dos operadores listados na célula) são avaliadas com a mesma precedência, na direcção dada. Por exemplo, a expressão
a=b=c é analisado como a=(b=c), e não como (a=b)=c devido a direita para a esquerda associatividade.Original:
Operators that are in the same cell (there may be several rows of operators listed in a cell) are evaluated with the same precedence, in the given direction. For example, the expression
a=b=c is parsed as a=(b=c), and not as (a=b)=c because of right-to-left associativity.The text has been machine-translated via Google Translate.
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Precedência de um operador não é afetado pela sobrecarga.
Original:
An operator's precedence is unaffected by overloading.
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Notas
A norma não especifica níveis de precedência. Eles são derivados a partir da gramática.
Original:
The standard itself doesn't specify precedence levels. They are derived from the grammar.
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const_cast, static_cast, dynamic_cast, reinterpret_cast e typeid não estão incluídos, uma vez que nunca são ambíguos.
Original:
const_cast, static_cast, dynamic_cast, reinterpret_cast and typeid are not included since they are never ambiguous.
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Alguns dos operadores têm grafias alternativas (por exemplo, para
and &&, or para ||, not para !, etc).Original:
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Veja também
Ordem de avaliação dos argumentos do operador em tempo de execução.
Original:
Ordem de avaliação of operator arguments at run time.
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