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<div class="t-tr-text">C + + conceptos:<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

 
 
C + + conceptos
Básica
Original:
Basic
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Biblioteca-Wide
Original:
Library-Wide
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EqualityComparable
LessThanComparable
Swappable(C++11)
ValueSwappable(C++11)
Container
Original:
Container
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Elementos contenedores
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Container Elements
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Iterator
Original:
Iterator
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Números aleatorios
Original:
Random Numbers
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Concurrencia
Original:
Concurrency
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BasicLockable(C++11)
Lockable(C++11)
TimedLockable(C++11)
Mutex(C++11)
TimedMutex(C++11)
Otros
Original:
Other
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Dos objetos de este tipo puede dejar de hacer referencia y los valores resultantes se pueden intercambiar utilizando swap() incondicional llamada de función en el contexto en el que tanto std::swap y los swap()s definidas por el usuario son accesibles .
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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[editar] Requisitos

Tipo T es ValueSwappable si
Original:
Type T is ValueSwappable if
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1)
T tipo cumple los requisitos Iterator
Original:
Type T satisfies the Iterator requirements
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2)
Para cualquier objeto x dereferencable de T tipo (es decir, cualquier valor que no sea el iterador final), *x satisface los 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.
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Muchas de las funciones de la biblioteca estándar esperan que sus argumentos para satisfacer ValueSwappable, lo que significa que cada vez que la biblioteca estándar realiza un intercambio, que utiliza el 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] Ejemplo

#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
}