Re: How to pass STL containers (say a vector) ?
tragomaskhalos skrev:
peter koch wrote:
Most likely not (at least in a non-debug build). RVO (google for that
one) will kick in and remove the redundant copy. This is the case for
all modern (2000 or later) compilers I know.
I don't think that the compiler that comes with MS VisualStudio 2003
does RVO, even for simple cases.
It surely does. VC 6.0 also did if I do not remember wrong. Remember
that not all compiles will result in RVO.... you have to enable at
least some optimisations.
/Peter
It could if your compiler cant optimise (which I doubt). If it can't
and you spend to much time returning your container, pass the
returnvalue by reference and finish with a swap instead of the return:
void tokenize(string const& s,vector<string>& result){
Yeah this is ugly but it works - it just comes down to whether you
prefer to optimise (prematurely ?) or retain a more natural syntax.
Sometimes you can recast a function from "getCollection" to
"fillCollection" to make the optimised form look more natural. Anyway,
roll on move constructors !
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