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    std::make_shared

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    C++
     
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    std::shared_ptr
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    definiert in Header <memory>
    template<class T, class... Args>
    shared_ptr<T> make_shared( Args&&... args);
    Erzeugt ein Objekt vom Typ T und wickelt es in einem std::shared_ptr mit args als Parameter-Liste für den Konstruktor T .
    Original:
    Constructs an object of type T and wraps it in a std::shared_ptr using args as the parameter list for the constructor of T.
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    Inhaltsverzeichnis

    [Bearbeiten]Parameter

    args -
    Liste der Argumente, mit denen eine Instanz T gebaut werden soll .
    Original:
    list of arguments with which an instance of T will be constructed.
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    [Bearbeiten]Rückgabewert

    std::shared_ptr einer Instanz des Typs T .
    Original:
    std::shared_ptr of an instance of type T.
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    [Bearbeiten]Ausnahmen

    Kann std::bad_alloc oder eine Ausnahme von der contructor der T geworfen werfen .
    Original:
    May throw std::bad_alloc or any exception thrown by the contructor of T.
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    [Bearbeiten]Notes

    Diese Funktion Speicher für die T-Objekt und für die shared_ptr der Kontrolle Block mit einem einzigen Speicherzuweisung. Im Gegensatz dazu führt die Erklärung std::shared_ptr<T> p(new T(Args...)) zwei Speicherzuordnungen, die unnötigen Overhead entstehen können .
    Original:
    This function allocates memory for the T object and for the shared_ptr's control block with a single memory allocation. In contrast, the declaration std::shared_ptr<T> p(new T(Args...)) performs two memory allocations, which may incur unnecessary overhead.
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    [Bearbeiten]Beispiel

    #include <iostream>#include <memory>   void foo(std::shared_ptr<int> i){(*i)++;}   int main(){auto sp = std::make_shared<int>(10); foo(sp);std::cout<<*sp <<std::endl;}

    Output: 

    11

    [Bearbeiten]Siehe auch

    		 erzeugt einen neuen shared_ptr
    (öffentliche Elementfunktion)[edit]
    		 erzeugt einen shared_ptr, der ein neues Objekt verwaltet, das mittels eines Allokators erzeugt wird.
    (Funktions-Template)[edit]
    Von „https://de.cppreference.com/mwiki/index.php?title=cpp/memory/shared_ptr/make_shared&oldid=31970“
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