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<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

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< cpp‎ | concept

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C++
 
C + + conceitos
Basic
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Basic
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Biblioteca-Wide
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Library-Wide
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(C++11)
ValueSwappable
(C++11)
Container
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Container
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Elementos de contêineres
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Container Elements
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Iterator
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Iterator
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Números aleatórios
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Random Numbers
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Simultaneidade
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Concurrency
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(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
Outro
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Other
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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.
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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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[editar] Requisitos

Tipo T é ValueSwappable se
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Type T is ValueSwappable if
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1)
T satisfaz os requisitos Iterator
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Type T satisfies the Iterator requirements
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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.
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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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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):.
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[editar] 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
}


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