动态数组类

DynamicArray.cpp代码示例

#include 
using namespace std;

template 
class DynamicArray
{
private:
    T* m_array;
    int m_length;
    
public:
    
    DynamicArray(int length = 0)
    {
        m_array = new T[length];
        
        if(m_array != NULL)
        {
            m_length = length; 
        } 
    }
    
    DynamicArray(const DynamicArray& obj)
    {
        m_array = new T[obj.m_length];
        
        if(m_array != NULL)
        {
            m_length = obj.m_length;
            for(int i = 0; i < obj.m_length; i++)
            {
                m_array[i] = obj.m_array[i];
            }
        }
    }
    
    DynamicArray& operator = (const DynamicArray& obj)
    {
        if(this != &obj)
        {
            T* array = new T[obj.m_length];
            
            if(array != NULL)
            {
                for(int i = 0; i < obj.m_length; i++)
                {
                    array[i] = obj.m_array[i];
                }
                
                T* temp = m_array;
                
                m_array = array;
                m_length = obj.m_length;
                
                delete [] temp;
            } 
            
        }
        
        return *this;
    }
    
    //动态设置数组的大小
    void resize(int length)
    {
        if(m_length != length)
        {
            T* array = new T[length];
            
            if(array != NULL)
            {
                int size = ((m_length < length ? m_length : length));
                
                for(int i = 0; i < size; i++)
                {
                    array[i] = m_array[i];
                }
                
                T* temp = m_array;
                m_array = array;
                m_length = length;
                
                delete [] temp;
            }
        }
    }
    
    
    //重载数组访问操作符
    T& operator [] (int i)
    {
        if((0 <= i) && (i < length()))
        {
            return m_array[i];
        }
    }

    //用非const版本实现const版本选去除当前对象的const属性再调用非const版本
    T operator [](int i) const
    {
        return (const_cast(*this))[i];
    }
    
    int length() const
    {
        return m_length;
    }
    
    ~DynamicArray()
    {
        delete [] m_array;
    }

};

int main()
{
    DynamicArray< DynamicArray > d;

    d.resize(3);

    for(int i=0; i

运行截图