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std::shared_ptr::operator==, !=, <, <=, >, >= – cppreference.com

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template <class T, class U> bool operator==(const shared_ptr<T>& lhs, const shared_ptr<U>& rhs);

 (1)

template <class T, class U> bool operator!=(const shared_ptr<T>& lhs, const shared_ptr<U>& rhs);

 (2)

template <class T, class U> bool operator<(const shared_ptr<T>& lhs, const shared_ptr<U>& rhs);

 (3)

template <class T, class U> bool operator>(const shared_ptr<T>& lhs, const shared_ptr<U>& rhs);

 (4)

template <class T, class U> bool operator<=(const shared_ptr<T>& lhs, const shared_ptr<U>& rhs);

 (5)

template <class T, class U> bool operator>=(const shared_ptr<T>& lhs, const shared_ptr<U>& rhs);

 (6)

template <class T> bool operator==(const shared_ptr<T>& lhs, std::nullptr_t rhs);

 (7)

template <class T> bool operator==(std::nullptr_t lhs, const shared_ptr<T>& rhs);

 (8)

template <class T> bool operator!=(const shared_ptr<T>& lhs, std::nullptr_t rhs);

 (9)

template <class T> bool operator!=(std::nullptr_t lhs, const shared_ptr<T>& rhs);

 (10)

template <class T> bool operator<(const shared_ptr<T>& lhs, std::nullptr_t rhs);

 (11)

template <class T> bool operator<(std::nullptr_t lhs, const shared_ptr<T>& rhs);

 (12)

template <class T> bool operator<=(const shared_ptr<T>& lhs, std::nullptr_t rhs);

 (13)

template <class T> bool operator<=(std::nullptr_t lhs, const shared_ptr<T>& rhs);

 (14)

template <class T> bool operator>(const shared_ptr<T>& lhs, std::nullptr_t rhs);

 (15)

template <class T> bool operator>(std::nullptr_t lhs, const shared_ptr<T>& rhs);

 (16)

template <class T> bool operator>=(const shared_ptr<T>& lhs, std::nullptr_t rhs);

 (17)

template <class T> bool operator>=(std::nullptr_t lhs, const shared_ptr<T>& rhs);

 (18)

Vergleicht zwei shared_ptr<T> Objekten oder vergleicht shared_ptr<T> mit einem Null-Zeiger .

Original:

Compares two shared_ptr<T> objects or compares shared_ptr<T> with a null pointer.

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Beachten Sie, dass die Vergleichsoperatoren für shared_ptr einfach vergleichen Zeigerwerte; die eigentlichen Objekte verwiesen wird, sind nicht verglichen. Nachdem operator< für shared_ptr definierten ermöglicht shared_ptrs als Schlüssel in assoziativen Containern verwendet werden, wie std::map und std::set .

Original:

Note that the comparison operators for shared_ptr simply compare pointer values; the actual objects pointed to are not compared. Having operator< defined for shared_ptr allows shared_ptrs to be used as keys in associative containers, like std::map and std::set.

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Parameter

lhs -

die linke shared_ptr zu vergleichen

Original:

the left-hand shared_ptr to compare

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rhs -

die rechte shared_ptr zu vergleichen

Original:

the right-hand shared_ptr to compare

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Rückgabewert

1) lhs.get() == rhs.get()

2) !(lhs == rhs)

3)

std::less<V>()(lhs.get(), rhs.get()), wobei V die zusammengesetzten Zeiger type

von T * und U *

Original:

std::less<V>()(lhs.get(), rhs.get()), where V is the composite pointer type

of T* and U*

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4) rhs < lhs

5) !(rhs < lhs)

6) !(lhs < rhs)

7) !lhs

8) !rhs

9) (bool)lhs

10) (bool)rhs

11) std::less<T*>()(lhs.get(), nullptr)

12) std::less<T*>()(nullptr, rhs.get())

13) nullptr < lhs

14) rhs < nullptr

15) !(nullptr < lhs)

16) !(rhs < nullptr)

17) !(lhs < nullptr)

18) !(nullptr < rhs)

Ausnahmen

Beispiel

Siehe auch

liefert einen Zeiger auf das verwaltete Objekt
(öffentliche Elementfunktion) [edit]