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                        class figure
{
//...
};
class triugolnik: public figure
{
//...
};
class kvadrat: public figure
{
//...
};
#define PAIR(f0, f1) std::make_tuple(std::type_index(typeid(f0)), std::type_index(typeid(f1)))
int PloshadTrehFigur(const figure& f0, const figure& f1, const figure& f2);//forward declaration
int PloshadDvuhFigur(const figure& f0, const figure& f1)
{
  static const std::unordered_map<
    std::tuple<std::type_index, std::type_index>, std::function<int(const figure&, const figure&)> 
  > caller 
    {
       {PAIR(triugolnik, kvadrat), ploshadTriugolnikIKvadrat},
       {PAIR(kvadrat, triugolnik), lispGovno::flip(ploshadTriugolnikIKvadrat)},
       {PAIR(kvadrat, kvadrat), ploshadKvadratIKvadrat},
       {PAIR(triugolnik, triugolnik), ploshadTriugolnikITriugolnik}
    };
    const auto& f = caller.find(PAIR(f0, f1));
    assert(f!=caller.end());
    f(f0, f1);
}
#undef PAIR