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C++ 旨在交换两个数值?
原标题:C++ builtin to swap two numerical values?
  • 时间:2010-07-10 14:03:00
  •  标签:
  • c++
  • stl
  • swap

C++是否建在STL部分,以交换两个数值,而不是:

int tmp = var1;

var1 = var2;
var2 = tmp;

与此类似:

std::swapValues(var1, var2);

当swapValues是一个模板。

最佳回答

http://en.cppvis.com/w/cpp/algorithm/swap”rel=“nofollow noreferer”>。

std::swap(var1, var2);
问题回答

正如斯蒂芬所说,使用<代码>std:swap(var1, var2);。

它是一个模版的职能,因此,你可以向特定类别提供自己的专业,例如智能点工,这些类别可能有昂贵的派任操作员:

namespace std
{
    template<>
    void swap<MySmartPointer>(MySmartPointer& v1, MySmartPointer& v2)
    {
        std::swap(v1.internalPointer, v2.internalPointer);
    }
}

// ...

std::swap(pointerA, pointerB); // super-fast!!!!1

那里还有Boost Swap。

http://www.boost.org/doc/libs/1_43_0/libs/utility/swap.html

它克服了目前标准互换执行方面的一些限制。 如果你想要提高您的几类工作的效率,你仍然必须提供自己的专业技能,但是,在如何提供这些专业方面,你有更大的余地。





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