template<typename Variant, typename ... F>
constexpr auto match(Variant&& v, F&& ... f)
noexcept(noexcept(std::visit(overloaded{ std::forward<decltype(f)>(f)... },
                             std::forward<decltype(v)>(v))))
{
    return std::visit(overloaded{ std::forward<decltype(f)>(f)... },
                      std::forward<decltype(v)>(v));
}

// ...
std::variant<int, double> variant;
match(
    variant,
    [](int){ /* code */ },
    [](double){ /* code */ }
);