Re: [boost] library for type erasure

8 Aug 2006


      Steven Watanabe wrote:
...
AMDG
Alexander,
This method seems to cover everything I can think of that is 
actually possible:
struct plus : function<plus, anyT (anyT const&, anyT const&)> {
    template<class R, class T0, class T1>
    R entry(const T0& t0, const T1& t1) {
       return(t0 + t1);
    }
}
template<>
struct overload<plus, int> {
    typedef typename transform<
       integral_types,
       binary_function<promotion_traits<int, _1>, int, _1>
    >::type type;
}
//other integral types are similar
template<>
struct overload<plus, string> {
    typedef vector<
       string(const string&, const string&),
       string(const string&, const char*),
       string(const char*, const string&)
    > type;
};
I don't understand how you iterate over all specializations
of overload template.


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Alexander Nasonov
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