Re: Vector extensions

At 01:20 PM 1/22/03 +0100, Kostyantyn Teplynskyy wrote:
>         Hellow, please advice me. I am working with vectors. My task is 
> to add my own functions to vectors. I have one decision:
>
> namespace std {
>     %extend vector {
>         char *myfunc{
>             ...
>         };
>     }
>     template (pParams) vector <Mystruct>;    // myfunc adds to pParams
>     template (sParams) vector <MyFloat>;       // but not adds to sParams
> };
>         And it's works but only for vector of structs or vector of 
> classes, by not for vectors of basic types like double

Kostyantyn,
        vector of built-ins are template specializations of the generic 
vector. My guess is that your %extend is only attached to the generic 
class. You'll have to attach it to the specializations as well---I think 
the less annoying way is to write:

namespace std {
    %extend vector {
        char *myfunc{
            ...
        };
    }
    %define specialize_myfunc(T)
    %extend vector<T> {
        char *myfunc{
            ...
        };
    }
    %enddef
    specialize_myfunc(bool);
    specialize_myfunc(int);
    specialize_myfunc(short);
    specialize_myfunc(long);
    specialize_myfunc(unsigned int);
    specialize_myfunc(unsigned short);
    specialize_myfunc(unsigned long);
    specialize_myfunc(double);
    specialize_myfunc(float);
    specialize_myfunc(std::string);
}

which reduces to a minimum the amouont of duplication, even though it does 
not avoid it completely. If the body of myfunc is large, you might consider 
defining it as a function in a %{ }% block (so that it is added to the C++ 
wrappers) and call it from within the %extend-added methods.

Hope this helps,
                Luigi

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