#include <iostream>
#include <string>

class Buffer {
private:
    struct Item {
        std::string value;
        Item* prev;
    };
    Item* currentPointer;
    int counter;

public:
    Buffer();
    ~Buffer();
    void Push(std::string X);
    std::string Pop();
    std::string Top();
    bool IsEmpty();
    void Clear();
    void HowMany();

};

Buffer::Buffer() {
    currentPointer = nullptr;
    counter = 0;
};

Buffer::~Buffer() {
    Clear();
};

void Buffer::Push(std::string X) {

    Item* a = new Item();
    a->value = X;
    a->prev = this->currentPointer;
    this->currentPointer = a;
    counter++;
};

std::string Buffer::Pop() {
    /*Item* d = this->currentPointer;*/
    std::string s = this->currentPointer->value;
    this->currentPointer = this->currentPointer->prev;
    /*delete d;*/
    counter--;
    return s;
};

std::string Buffer::Top(){
    return this->currentPointer->value;
};

bool Buffer::IsEmpty() {
    return this->currentPointer == nullptr;
};

void Buffer::Clear() {
    while (!IsEmpty()) {
        this->Pop();
    }

};

void Buffer::HowMany() {
    std::cout << "V zasobniku je " << counter << " polozek." << std::endl;
}
;
int main() {
    Buffer words;
    std::string a, b;
    a = "kunda";
    b = "kunda2";

    words.Push(a);
    words.HowMany();
    std::cout << words.Top() << std::endl;
    a = a + b;
    words.Push(a);
    std::cout << words.Top() << std::endl;



    system("pause");
    return 1;
}