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      operators

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      Índice

      [editar]Sobrecarga de operador

      [editar]Sintaxe

      typeoperatorop(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
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        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>usingnamespace 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 namefriend 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;   return0;}

      Saída: 

      3/8 3 1/2

      [editar]Consulte também

      Operadores comuns
      assinamento incremento
      descremento      		 aritmético lógico comparação acesso
      de membro      		 outros

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

      a(...)
      a, b
      ?:

      Operadores Especiais

      static_cast converte um tipo a um outro tipo relacionado
      dynamic_cast converte dentro de hierarquias de herança
      const_cast adiciona ou remove qualificadores cv
      reinterpret_cast converte tipo a tipo não relacionado
      C-style cast converte um tipo a um outro por uma mistura de static_cast, const_cast, e reinterpret_cast
      new cria objetos com duração de armazenamento dinâmico
      delete destrói objetos anteriormente criads pela expressão new e libera área de memória obtida
      sizeof pesquisa o tamanho de um tipo
      sizeof... pesquisa o tamanho de um pacote de parâmetro(desde C++11)
      typeid pesquisa a informação de tipo de um tipo
      noexcept checa se uma expressão pode lançar uma exceção (desde C++11)
      alignof pesquisa requerimentos de alinhamento de um tipo (desde C++11)

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