noexcept operator (seit C++11)

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Die noexcept Operator führt einen Compiler-Check, der true zurückgibt, wenn ein Ausdruck erklärt nicht werfen keine Ausnahmen .

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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Es kann innerhalb einer Funktion Vorlage

noexcept Spezifizierer

Original:

noexcept specifier

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verwendet werden, um zu erklären, dass die Funktion Ausnahmen für bestimmte Arten, andere aber nicht werfen .

Original:

It can be used within a function template's

noexcept Spezifizierer

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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Syntax

noexcept( expression )

Gibt ein Objekt vom Typ bool .

Original:

Returns an object of type bool.

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Erklärung

Die noexcept Betreiber nicht beurteilen expression. Das Ergebnis ist, wenn die false expression enthält mindestens eine der folgenden potenziell ausgewertet Konstrukte:

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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• anrufen, um jede Art von Funktion, die keine nicht-Werfen Exception-Spezifikation, es sei denn, es ist ein

  konstanten Ausdruck

  Original:

  constant expression

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  ist .

  Original:

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

  konstanten Ausdruck

  Original:

  constant expression

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  .

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• throw Ausdruck

  Original:

  throw expression

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• dynamic_cast Ausdruck, wenn die Umwandlung eine Laufzeit Prüfung muss

  Original:

  dynamic_cast expression when the conversion needs a run time check

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• typeid Ausdruck, wenn Argumenttyp polymorphe Klasse Typ ist

  Original:

  typeid expression when argument type is polymorphic class type

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In allen anderen Fällen ist das Ergebnis true .

Original:

In all other cases the result is true.

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Keywords

noexcept

Beispiel

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;
}

Siehe auch

noexcept Spezifizierer	erfordert eine Funktion nicht werfen keine Ausnahmen (C++11) 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.
Exception-Spezifikation	legt fest, welche Ausnahmen von einer Funktion (veraltet) geworfen werden Original: specifies what exceptions are thrown by a function (veraltet) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.