std::result_of – cppreference.com

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definiert in Header `<type_traits>`

`template< class > class result_of; //not defined`	(1)	(seit C++11)

`template< class F, class... ArgTypes > class result_of<F(ArgTypes...)>;`	(2)	(seit C++11)

Leitet den Rückgabetyp einer Funktion Anruf Ausdruck bei der Kompilierung .

Original:

Deduces the return type of a function call expression at compile time.

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Mitglied Typen


Mitglied Typ Original: Member type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	Definition

`type`	der Rückgabetyp der Funktion `F`, wenn mit den Argumenten `ArgTypes...` genannt Original: the return type of the function `F` if called with the arguments `ArgTypes...` The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Mögliche Implementierung

template<class>
struct result_of;

template<class F, class... ArgTypes>
struct result_of<F(ArgTypes...)>
{
    typedef decltype(
                     std::declval<F>()(std::declval<ArgTypes>()...)
                    ) type;
};

Beispiel

struct S {
    double operator()(char, int&);
};

int main()
{
    std::result_of<S(char, int&)>::type f = 3.14; // f has type double
}

Siehe auch


	erhält die Art des Ausdrucks in unevaluierten Kontext Original: obtains the type of expression in unevaluated context The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktions-Template) [edit]