noexcept operator (desde C++11)

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O operador noexcept executa uma verificação em tempo de compilação que retorna true se uma expressão for declarada a não lançar quaisquer exceções.

Original:

The noexcept operator performs a compile-time check that returns true if an expression is declared to not throw any exceptions.

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Ele pode ser usado dentro de

noexcept especificador

Original:

noexcept specifier

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um modelo de função de declarar que a função irá lançar exceções para alguns tipos, mas não outros.

Original:

It can be used within a function template's

noexcept especificador

Original:

noexcept specifier

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to declare that the function will throw exceptions for some types but not others.

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Sintaxe

noexcept( expression )

Retorna um objeto do tipo bool.

Original:

Returns an object of type bool.

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Explicação

O operador noexcept não avalia expression. O resultado é que o false expression contém pelo menos uma das seguintes construções potencialmente avaliados:

Original:

The noexcept operator does not evaluate expression. The result is false if the expression contains at least one of the following potentially evaluated constructs:

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• ligar para qualquer tipo de função que não tem não jogando especificação de exceção, a menos que seja um

  expressão constante

  Original:

  constant expression

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  .

  Original:

  call to any type of function that does not have non-throwing exception specification, unless it is a

  expressão constante

  Original:

  constant expression

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  .

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• throw expressão

  Original:

  throw expression

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• dynamic_cast expressão quando a conversão necessita de um tempo de execução de verificação

  Original:

  dynamic_cast expression when the conversion needs a run time check

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• typeid expressão quando o tipo de argumento é do tipo classe polimórfica

  Original:

  typeid expression when argument type is polymorphic class type

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Em todos os outros casos, o resultado é true.

Original:

In all other cases the result is true.

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Palavras-chave

noexcept

Exemplo

template <class T>
void self_assign(T& t) noexcept(noexcept(T::operator=)) 
{ // self_assign is noexcept if and only if T::operator= is noexcept
    t = t;
}

Veja também

noexcept especificador	requer uma função para não jogar qualquer (C++11) exceções Original: requires a function to not throw any exceptions (C++11) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
especificação de exceção	especifica que as exceções são lançadas por um (obsoleta) função Original: specifies what exceptions are thrown by a function (obsoleta) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.