<div class="t-tr-text">C + +: conceitos<div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig">C++ concepts:</div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div> ValueSwappable
De cppreference.com
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Dois objetos deste tipo podem ser dereferenced e os valores resultantes podem ser trocados usando
swap() chamada não qualificada função no contexto em que tanto std::swap e os swap()s definidas pelo usuário são visíveis.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.The text has been machine-translated via Google Translate.
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Requisitos
Tipo T é
ValueSwappable seOriginal:
Type T is
ValueSwappable ifThe text has been machine-translated via Google Translate.
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1)
T satisfaz os requisitos IteratorOriginal:
Type
T satisfies the Iterator requirementsThe text has been machine-translated via Google Translate.
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2)
Para qualquer objeto
x dereferencable de T tipo (ou seja, qualquer valor diferente do iterador final), *x satisfaz os requisitos Swappable.Original:
For any dereferencable object
x of type T (that is, any value other than the end iterator), *x satisfies the Swappable requirements.The text has been machine-translated via Google Translate.
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Muitas funções da biblioteca padrão esperam que os seus argumentos para satisfazer
ValueSwappable, o que significa que a qualquer momento a biblioteca padrão executa um swap, ele usa o equivalente a using std::swap; swap(*iter1, *iter2):.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):.The text has been machine-translated via Google Translate.
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Exemplo
#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
}