数组类的创建（下）：DynamicArray

Posted 2021-10-15 学习只为旅行

#ifndef DYNAMICARRAY_H
#define DYNAMICARRAY_H

#include "array.h"
#include "Exception.h"

namespace DragonLib {

template <typename T>
class DynamicArray : public Array<T>
{
protected:
    int m_length;
public:
    DynamicArray(int length)
    {
        this->m_array=new T[length];

        if(this->m_array!=NULL)
        {
            this->m_length=length;
        }
        else
        {
            THROW_EXCEPTION(NoEnoughMemoryException,"No memory to create DynamicArray object...");
        }
    }

    DynamicArray(const DynamicArray<T>& obj)
    {
        this->m_array=new T[obj.m_length];

        if(this->m_array!=NULL)
        {
            this->m_length=obj.m_length;

            for(int i=0;i<obj.m_length;i++)
            {
                this->m_array[i]=obj.m_array[i];
            }
        }
        else
        {
            THROW_EXCEPTION(NoEnoughMemoryException,"No memory to create DynamicArray object...");
        }
    }

    DynamicArray<T>& operator = (const DynamicArray<T>& 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 = this->m_array;

                this->m_array=array;
                this->m_length=obj.m_length;

                delete[] temp;
            }
            else
            {
                THROW_EXCEPTION(NoEnoughMemoryException,"No memory to create copy object...");
            }
        }
        return *this;
    }

    int length() const
    {
        return m_length;
    }

    void resize(int length)
    {
        if(length != m_length)
        {
            T* array = new T[length];

            if(array != NULL)
            {
                int size = (length<m_length)?length:m_length;

                for(int i=0;i<size;i++)
                {
                    array[i]=this->m_array[i];
                }

                T* temp=this->m_array;

                this->m_array=array;
                this->m_length=length;

                delete[] temp;
            }
            else
            {
                THROW_EXCEPTION(NoEnoughMemoryException,"No memory to resize object...");
            }
        }
    }

    ~DynamicArray()
    {
        delete[] this->m_array;
    }
};
}

#endif // DYNAMICARRAY_H

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小结