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operators

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Assembly embutido
 

Índice

[editar] Sobrecarga de operador

[editar] Sintaxe

type operator op ( params ) ;

[editar] Explicação

  • <type> é / são o (s) das variáveis ​​.
    Original:
    <type> is/are the type(s) of the variables.
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  • <op> é o operador particular (por exemplo +, +=, <<, >>, &&, ||, %, etc).
    Original:
    <op> is the particular operator (e.g. +, +=, <<, >>, &&, ||, %, etc.).
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  • <params> é / são o (s) nome dos parâmetros necessários (depende da operadora).
    Original:
    <params> is/are the name(s) of the required parameters (depends on the operator).
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[editar] Restrições

  • Você não pode criar novos operadores, como ** ou &|.
    Original:
    You cannot create new operators such as ** or &|.
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  • Nem todos os operadores podem ser sobrecarregados
    Original:
    Not all operators can be overloaded
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  • Algumas operadoras só pode ser sobrecarregado como membros não-estáticos da classe
    Original:
    Some operators can only be overloaded as non-static class members
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  • Avaliação curto-circuito não funciona com operadores sobrecarregados
    Original:
    Short-circuit evaluation doesn't work with overloaded operators
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[editar] Convida operador

Operadores sobrecarregados podem ser chamadas usando a notação infixa habitual
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Overloaded operators can be called using the usual infix notation
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a+b
ou uma função semelhante a notação
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or a function-like notation
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operator+(a,b)

[editar] Exemplo

#include <iostream>
 using namespace std;
 
 class Fraction{
   private:
     int numerator, denominator;
 
   public:
     Fraction(int n, int d): numerator(n), denominator(d) {}
   // Note that the keyword operator combined with an actual
   // operator is used as the function name
   friend ostream& operator<<(ostream&, Fraction&);
 };
 
 ostream& operator<<(ostream& out, Fraction& f){
   out << f.numerator << '/' << f.denominator;
   return out;
 }
 
 int main(){
   Fraction f1(3, 8);
   Fraction f2(1, 2);
 
   cout << f1 << endl;
   cout << 3 << ' ' << f2 << endl;
 
   return 0;
 }

Output:

3/8
3 1/2

[editar] Consulte também

Common operators
atribuição incrementNJdecrement aritmética lógico comparação memberNJaccess outro

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 um tipo para outro
tipo compatível
Original:
static_cast converts one type to another compatible type
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dynamic_cast converte classe base virtual para class
derivados
Original:
dynamic_cast converts virtual base class to derived class
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const_cast converte tipo para tipo compatível com diferentes cv qualifiers
Original:
const_cast converts type to compatible type with different cv qualifiers
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reinterpret_cast converte tipo de type
incompatíveis
Original:
reinterpret_cast converts type to incompatible type
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new aloca memory
Original:
new allocates memory
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delete desaloca memory
Original:
delete deallocates memory
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sizeof consulta o tamanho de um type
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sizeof queries the size of a type
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sizeof... consulta o tamanho de um bloco de parâmetros (a partir do C++ 11)
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sizeof... queries the size of a bloco de parâmetros (a partir do C++ 11)
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typeid consulta o tipo de informação de uma type
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typeid queries the type information of a type
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noexcept verifica se uma expressão pode lançar uma (a partir do C++ 11)
exceção
Original:
noexcept checks if an expression can throw an exception (a partir do C++ 11)
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alignof consultas exigências de alinhamento de um (a partir do C++ 11) tipo
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alignof queries alignment requirements of a type (a partir do C++ 11)
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