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List:       kde-devel
Subject:    Re: std::swap replacement?
From:       Thiago Macieira <thiago.macieira () kdemail ! net>
Date:       2005-01-27 22:39:40
Message-ID: 200501272039.40790.thiago.macieira () kdemail ! net
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Esben Mose Hansen wrote:
>Can I do something like this in QTL for QValueList<T>?

Yes

>If not, does QT or KDE provide a swap template like the one below?
>
>template<typename T>
>void swap(T& lhs, T& rhs) {
>   T tmp(lhs);
>   lhs=rhs;
>   rhs=tmp;
>}

That's more or less STL's definition of swap:

  template<typename _Tp>
    inline void
    swap(_Tp& __a, _Tp& __b)
    {
      // concept requirements
      __glibcxx_function_requires(_SGIAssignableConcept<_Tp>)

      const _Tp __tmp = __a;
      __a = __b;
      __b = __tmp;
    }

Since QTL's containers are implicitly shared, the operation is O(1) in CPU 
time and memory.

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  Thiago Macieira  -  thiago (AT) macieira (DOT) info
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