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C++ Operator Precedence

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C++
 
Linguaggio C + +
Temi generali
Original:
General topics
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Controllo del flusso
Original:
Flow control
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Dichiarazioni esecuzione condizionale
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Conditional execution statements
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Iterazione dichiarazioni
Original:
Iteration statements
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Vai dichiarazioni
Original:
Jump statements
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Funzioni
Original:
Functions
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dichiarazione di funzione
lambda funzione dichiarazione
funzione di modello
specificatore inline
eccezioni specifiche (deprecato)
noexcept specificatore (C++11)
Eccezioni
Original:
Exceptions
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Spazi dei nomi
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Namespaces
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Tipi
Original:
Types
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decltype specifier (C++11)
Specifiers
Original:
Specifiers
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cv specificatori
Durata di stoccaggio specificatori
constexpr specificatore (C++11)
specificatore auto (C++11)
alignas specificatore (C++11)
Inizializzazione
Original:
Initialization
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Letterali
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Literals
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Espressioni
Original:
Expressions
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operatori
precedenza degli operatori
rappresentazioni alternative
Utilities
Original:
Utilities
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Tipi
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Types
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typedef declaration
Tipo alias dichiarazione (C++11)
attributi (C++11)
Lancia
Original:
Casts
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conversioni implicite
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
Fusione C-stile e funzionale
Occupazione della memoria
Original:
Memory allocation
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Classi
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Classes
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Specifiche per una classe di funzioni proprietà
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Class-specific function properties
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esplicito (C++11)
statico
Funzioni membro speciali
Original:
Special member functions
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Modelli
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Templates
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classe template
funzione di modello
modello di specializzazione
parametri confezioni (C++11)
Varie
Original:
Miscellaneous
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Montaggio in linea
 
La seguente tabella elenca le priorità e l'associatività degli operatori del C + +. Gli operatori sono elencati dall'alto verso il basso, in ordine decrescente la precedenza.
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
Durante l'analisi un'espressione, un operatore che è quotata su qualche riga sarà legato più stretto (come se tra parentesi) per i suoi argomenti di qualsiasi operatore che è elencato in una riga più sotto di esso. Ad esempio, le espressioni e std::cout<<a&b *p++ vengono analizzati come (std::cout<<a)&b e *(p++), e non come std::cout<<(a&b) o (*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)++.
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Operatori che si trovano nella stessa cella (ci possono essere molte file di operatori elencati in una cella) vengono valutate con la stessa priorità, nella direzione data. Ad esempio, l'espressione a=b=c viene analizzato come a=(b=c), e non come causa di (a=b)=c da destra a sinistra associatività.
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.
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Precedenza di un operatore non è influenzato da sovraccarico.
Original:
An operator's precedence is unaffected by overloading.
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[modifica] Note

La stessa norma non specifica i livelli di precedenza. Esse derivano dalla grammatica.
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 typeid e non sono inclusi in quanto non sono mai ambigui.
Original:
const_cast, static_cast, dynamic_cast, reinterpret_cast and typeid are not included since they are never ambiguous.
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Alcuni operatori hanno ortografie alternative (ad esempio, per and &&, or per ||, not per !, ecc).
Original:
Some of the operators have ortografie alternative (e.g., and for &&, or for ||, not for !, etc.).
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[modifica] Vedi anche

Ordine di valutazione di argomenti dell'operatore in fase di esecuzione.
Original:
Ordine di valutazione of operator arguments at run time.
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Common operators
assegnazione incrementNJdecrement aritmetica logico confronto memberNJaccess altra

a = b
a = rvalue
a += b
a -= b
a *= b
a /= b
a %= b
a &= b
a |= b
a ^= b
a <<= b
a >>= b

++a
--a
a++
a--

+a
-a
a + b
a - b
a * b
a / b
a % b
~a
a & b
a | b
a ^ b
a << b
a >> b

!a
a && b
a || b

a == b
a != b
a < b
a > b
a <= b
a >= b

a[b]
*a
&a
a->b
a.b
a->*b
a.*b

a(...)
a, b
(type) a
? :

Special operators
static_cast converte un tipo a un altro
tipo compatibile
Original:
static_cast converts one type to another compatible type
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dynamic_cast converte classe virtuale di base per class
derivato
Original:
dynamic_cast converts virtual base class to derived class
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const_cast converte il tipo di tipo compatibile con diversi cv qualifiers
Original:
const_cast converts type to compatible type with different cv qualifiers
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reinterpret_cast converte tipo type
incompatibile
Original:
reinterpret_cast converts type to incompatible type
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new alloca memory
Original:
new allocates memory
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delete dealloca memory
Original:
delete deallocates memory
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sizeof interroga la dimensione di un type
Original:
sizeof queries the size of a type
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sizeof... interroga le dimensioni di un parametro confezione (dal C++11)
Original:
sizeof... queries the size of a parametro confezione (dal C++11)
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typeid interroga le informazioni sul tipo di una type
Original:
typeid queries the type information of a type
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noexcept controlla se un'espressione può lanciare una (dal C++11)
un'eccezione
Original:
noexcept checks if an expression can throw an exception (dal C++11)
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alignof query requisiti di allineamento di un (dal C++11) tipo
Original:
alignof queries alignment requirements of a type (dal C++11)
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Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/language/operator_precedence&oldid=27343"