C + + Konzepte: ValueSwappable – cppreference.com
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Zwei Objekte dieses Typs können dereferenziert und die daraus resultierenden Werte können vertauscht mit unqualifizierten Funktionsaufruf swap() im Kontext, wo sowohl std::swap und die benutzerdefinierten swap()s sichtbar sind .
Original:
Two objects of this type can be dereferenced and the resulting values can be swapped using unqualified function call swap() in the context where both std::swap and the user-defined swap()s are visible.
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Anforderungen
Typ T ist ValueSwappable wenn
Original:
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1)
Typ T erfüllt die Iterator Anforderungen
Original:
Type T satisfies the Iterator requirements
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2)
Für jede dereferencable Objekt x vom Typ T (das heißt, ein anderer Wert als Ende iterator) erfüllt *x die Swappable Anforderungen .
Original:
For any dereferencable object x of type T (that is, any value other than the end iterator), *x satisfies the Swappable requirements.
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Viele Standard-Bibliothek Funktionen erwarten ihre Argumente ValueSwappable, was bedeutet, dass zu jeder Zeit die Standard-Bibliothek führt eine Swap es das Äquivalent von using std::swap; swap(*iter1, *iter2): verwendet bedeutet, zu befriedigen .
Original:
Many standard library functions expect their arguments to satisfy ValueSwappable, which means that any time the standard library performs a swap, it uses the equivalent of using std::swap; swap(*iter1, *iter2):.
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Beispiel
#include <iostream> #include <vector> class IntVector { std::vector<int> v; IntVector& operator=(IntVector); // not assignable public: void swap(IntVector& other) { v.swap(other.v); } }; void swap(IntVector& v1, IntVector& v2) { v1.swap(v2); } int main() { IntVector v1, v2; // IntVector is Swappable, but not MoveAssignable IntVector* p1 = &v1; IntVector* p2 = &v2; // IntVector* is ValueSwappable std::iter_swap(p1, p2); // OK: iter_swap requires ValueSwappable // std::swap(v1, v2); // compiler error! std::swap requires MoveAssignable }