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enobayram/linear_complexity_overload.cpp

Created December 16, 2016 07:06
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linear_complexity_overload.cpp
#include <string>
#include <stdio.h>
template<class Func>
struct overload_base {
Func f;
template <class ... T>
friend decltype(f(std::declval<T>()...)) call(overload_base * b, T ... in) {
return b->f(in...);
}
};
template<class ... Funcs>
struct overload_impl: overload_base<Funcs>... {
overload_impl(Funcs...funcs): overload_base<Funcs>{funcs}...{}
template <class ... T>
auto operator()(T ... i) {
return call(this, i ...);
}
};
template<class ... Funcs>
overload_impl<Funcs...> overload(Funcs...funcs){return {funcs...};}
struct MyNewVisitor {
int operator()(double d) {
return d*2;
}
std::string operator()(std::string i) {
return "kafama gore string";
}
};
int main() {
auto var = overload([](double d) {return d*2;}, [](std::string i){return "kafama gore string";})(6.0);
printf("%f", var);
}
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