cpp-practice/57_stack/1_stack_using_arrays/stack_array.cpp at main · AwesomeSam9523/cpp-practice · GitHub

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template <typename T>
class Stack {
    T *data;
    int size;
    int capacity;

public:
    Stack() {
        capacity = 5;
        data = new T[capacity];
        size = 0;
    }

    void push(T element) {
        if (size == capacity) {
            T *newData = new T[capacity*2];
            for (int i = 0; i < capacity; i++) {
                newData[i] = data[i];
            }
            capacity *= 2;
            data = newData;
        }
        data[size] = element;
        size++;
    }

    bool isEmpty() {
        return size == 0;
    }

    T pop() {
        if (isEmpty()) {
            return 0;
        }

        T element = data[size-1];
        size--;
        return element;
    }

    T top() {
        T element = data[size-1];
        return element;
    }

    int getSize() {
        return size;
    }

};