source: doc/papers/OOPSLA17/evaluation/cpp-vstack.hpp

#pragma once
#include "object.hpp"

class stack {
        struct node {
                ptr<object> value;
                node* next;

                node( const object& v, node* n = nullptr );
        };
        node* head;

        void copy(const stack& o);
public:
        stack();
        stack(const stack& o);
        stack(stack&& o);
        ~stack();
        stack& operator= (const stack& o);
        stack& operator= (stack&& o);

        void clear();
        bool empty() const;
        void push(const object& value);
        ptr<object> pop();
};