#ifndef std_h
#define std_h

#include <optional>
#include <stack>

template<typename T> class stack
{
public:
    void push(T t) { container.push(t); }

    std::optional<T> pop()
    {
        if (!container.empty())
        {
            T data = container.top();
            container.pop();
            return std::optional<T>(data);
        }
        else
        {
            return std::nullopt;
        }
    }

private:
    std::stack<T> container;
};

#endif // std_h