#include <string>
#include <variant>
#include <stdio.h>

template <typename...Ts>
struct variant_inspector : std::tuple<Ts const*...>
{
    variant_inspector(std::variant<Ts...> const& v)
        : std::tuple<Ts const*...>{ (std::holds_alternative<Ts>(v) ? &std::get<Ts>(v) : nullptr)... }
    {}
};

template <typename...Ts>
struct variant_inspector<Ts...>
    make_variant_inspector(std::variant<Ts...> const& v)
{
    return variant_inspector<Ts...>{v};
}


#define CONCATENATE_DIRECT(s1, s2) s1##s2
#define CONCATENATE(s1, s2) CONCATENATE_DIRECT(s1, s2)
#define ANONYMOUS_VARIABLE(str) CONCATENATE(str, __LINE__)
#define VARIANT_INSPECTOR(v) auto const& ANONYMOUS_VARIABLE(variant_inspector_LINE_) = make_variant_inspector(v)

auto variadic_generic_lambda = [](auto... param) {};

int main()
{
    std::variant<std::string,  float, int> v;

    v = 45;
    VARIANT_INSPECTOR(v);

    v = "hello world";
    VARIANT_INSPECTOR(v);

    return 0;
}