Re: Array vs std::vector + free operators

Posted by DU VIGNAUD DE VILLEFORT FRANCOIS GASAPRD PHI on Apr 19, 2007; 5:52pm
URL: http://quantlib.414.s1.nabble.com/Array-vs-std-vector-free-operators-tp9392p9393.html



>Apart from adding operations to std::vector, the above is not as
>efficient as Array:operator+. if you write

>std::vector<Real> w = u+w;

>the addition returns a Disposable, but the std::vector constructor
>doesn't know what to do with it, so it copies its contents instead of
>swapping. If you want full efficiency, you have to write:

>std::vector<Real> w;
>w.swap(u+v);

>which is more awkward. On the other hand, Array defines a constructor
>taking a Disposable, so there's no moving in

>Array w = u+v;

I badly missed this point, I will slap myself with bjarne's book ;-)

François

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