#include #include using namespace std; enum DataType { Int, Float, String, }; struct Info { DataType typ; }; struct Data { template T read(Info i)const { return T(); } }; void write(int) { cout << "INT" << endl; } void write(float) { cout << "FLOAT" << endl; } void write(string) { cout << "STRING" << endl; } template void perform(const Info& i, const Data& d){ T value = d.read(i); write(value); } template struct Dispatch { static void dispatch(const Info& i, const Data& d) { if (i.typ == N) perform(i, d); else Dispatch::dispatch(i, d); } }; template struct Dispatch { static void dispatch(const Info& i, const Data& d) { if (i.typ == N) perform(i, d); } }; void run(const Info& i, const Data& d) { Dispatch<0, int, float, string>::dispatch(i, d); } int main() { Data d1; Info i1{ Float }; run(i1, d1); Info i2{ String }; run(i2, d1); }