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#include<iostream>
using namespace std;
template<typename T>
struct node {
T value;
node<T>* next;
};
template<class T>
class stack {
public:
stack() : _head{nullptr} {}
~stack() {
auto iter = _head;
while(iter) {
delete iter;
iter = iter->next;
}
}
stack<T>* push(T val) {
if(!_head) {
_head = new node<T>{val, nullptr};
} else {
_head = new node<T>{val, _head};
}
return this;
}
node<T>* pop() {
if(!_head) return nullptr;
node<T>* elem = _head;
delete _head;
_head = elem->next;
return elem;
}
void print() {
auto iter = _head;
while(iter) {
cout << iter->value << ' ';
iter = iter->next;
}
cout << endl;
}
private:
node<T>* _head;
};
int main() {
stack<int>* s = new stack<int>();
s->pop();
s->push(4)->push(2)->push(8);
s->print();
auto e = s->pop();
if(e)
cout << e->value << endl;
s->push(1);
s->print();
delete s;
return 0;
}
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