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<div class="t-tr-text">C + +の概念:<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

提供: cppreference.com
< cpp‎ | concept

 
 
C + +の概念
基本
Original:
Basic
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ライブラリワイド
Original:
Library-Wide
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EqualityComparable
LessThanComparable
Swappable(C++11)
ValueSwappable(C++11)
コンテナ
Original:
Container
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コンテナ要素
Original:
Container Elements
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イテレータ
Original:
Iterator
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乱数
Original:
Random Numbers
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同時実行
Original:
Concurrency
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BasicLockable(C++11)
Lockable(C++11)
TimedLockable(C++11)
Mutex(C++11)
TimedMutex(C++11)
その他
Original:
Other
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この型の2つのオブジェクトを間接参照することができ、結果の値はswap()とユーザー定義std::swaps両方が表示されている..コンテキストに修飾されていない関数呼び出しswap()を使用して交換することができます
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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[編集] 要件

タイプTはValueSwappable場合です
Original:
Type T is ValueSwappable if
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1)
タイプTIterator要件を満たしています
Original:
Type T satisfies the Iterator requirements
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2)
タイプxのいずれdereferencableオブジェクトT(つまり、エンドイテレータ以外の任意の値)については、*xSwappable要件を満たし.
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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多くの標準ライブラリ関数は、引数が標準ライブラリにはスワップを実行する任意の時間は、それがValueSwappableと同等のものを使用することを意味しusing std::swap; swap(*iter1, *iter2):を満たすことを期待し.
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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[編集]

#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
}