用C++编写一个vector头文件，给出代码

以下是一个简单的vector头文件的示例代码：

#ifndef VECTOR_H
#define VECTOR_H

template<typename T>
class Vector {
private:
    T* data;
    int size;
    int capacity;

    void resize(int newCapacity) {
        T* newData = new T[newCapacity];
        for (int i = 0; i < size; i++) {
            newData[i] = data[i];
        }
        delete[] data;
        data = newData;
        capacity = newCapacity;
    }

public:
    Vector() : data(nullptr), size(0), capacity(0) {}

    Vector(const Vector<T>& other) : data(nullptr), size(0), capacity(0) {
        *this = other;
    }

    ~Vector() {
        delete[] data;
    }

    Vector<T>& operator=(const Vector<T>& other) {
        if (this == &other) {
            return *this;
        }
        delete[] data;
        data = new T[other.capacity];
        for (int i = 0; i < other.size; i++) {
            data[i] = other.data[i];
        }
        size = other.size;
        capacity = other.capacity;
        return *this;
    }

    void push_back(const T& value) {
        if (size == capacity) {
            int newCapacity = (capacity == 0 ? 1 : capacity * 2);
            resize(newCapacity);
        }
        data[size++] = value;
    }

    void pop_back() {
        if (size > 0) {
            size--;
        }
    }

    int getSize() const {
        return size;
    }

    T& operator[](int index) {
        return data[index];
    }

    const T& operator[](int index) const {
        return data[index];
    }
};

#endif

该vector类支持动态增长，能够自动调整容量以适应元素的数量。它可以存储任何类型的元素，并提供常规的vector操作，如push_back、pop_back、operator[]等等。