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.The text has been machine-translated via Google Translate.
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Ele pode ser usado dentro de
noexcept especificador
um modelo de função de declarar que a função irá lançar exceções para alguns tipos, mas não outros.Original:
noexcept specifier
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Original:
It can be used within a function template's
noexcept especificador
to declare that the function will throw exceptions for some types but not others.Original:
noexcept specifier
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You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.
The text has been machine-translated via Google Translate.
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Sintaxe
noexcept( expression )
|
|||||||||
Retorna um objeto do tipo
bool. Original:
Returns an object of type
bool. The text has been machine-translated via Google Translate.
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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:The text has been machine-translated via Google Translate.
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- ligar para qualquer tipo de função que não tem não jogando especificação de exceção, a menos que seja umexpressão constante.Original:constant expressionThe text has been machine-translated via [http://translate.google.com Google Translate].
You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.Original:call to any type of function that does not have non-throwing exception specification, unless it is aexpressão constante.Original:constant expressionThe text has been machine-translated via [http://translate.google.com Google Translate].
You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions. throwexpressãoOriginal:throwexpressionThe text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.dynamic_castexpressão quando a conversão necessita de um tempo de execução de verificaçãoOriginal:dynamic_castexpression when the conversion needs a run time checkThe text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.typeidexpressão quando o tipo de argumento é do tipo classe polimórficaOriginal:typeidexpression when argument type is polymorphic class typeThe text has been machine-translated via Google Translate.
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Em todos os outros casos, o resultado é
true.Original:
In all other cases the result is
true.The text has been machine-translated via Google Translate.
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Palavras-chave
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;
}