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#include <iostream>
#include <concepts>
#include <utility>
#include <string>
#include <vector>
#include <queue>
//sum
size_t sum()
{
return 0;
}
template <typename First, typename ...Types>
size_t sum(First &&first, Types &&...types)
{
return first.size() + sum(std::forward<Types>(types)...);
}
//=
//hassize
template <typename Types>
concept HasSize =
requires (Types type)
{
{ type.size() } -> std::same_as<size_t>;
};
//=
//sum2
size_t sum2()
{
return 0;
}
template <HasSize First, HasSize ...Types>
size_t sum2(First &&first, Types &&...types)
{
return first.size() + sum2(std::forward<Types>(types)...);
}
//=
//sumfun
template <HasSize ...Types>
void fun(Types &&...obj)
{
sum(std::forward<Types &&>(obj)...);
}
//=
//sizetypes
template <HasSize ...Types>
class SizeTypes
{
// ...
};
//=
using namespace std;
//main
int main()
{
fun(queue<int>{}, vector<int>{}, string{});
cout << sum2(queue<int>{}, vector<int>{}, string{}) << '\n';
}
//=
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