数据结构练习（14）含有指针成员的类的拷贝

http://zhedahht.blog.163.com/blog/static/25411174200722710364233/

上次面试就被问到copy constructor，无奈C++白痴了，这两天狂啃C++ primer和JAVA的时候感觉很多问题似曾相识。

C++果然很强大，用起来神清气爽，是时候入门C++了！

另外看到了stackoverflow上面一个关于unsigned的讨论：

http://stackoverflow.com/questions/2099830/unsigned-keyword-in-c

#include <iostream>
using namespace std;

template <typename T> class Array
{
public:
    Array(unsigned arraysize) : data(0), size(arraysize)
    {
        if (size > 0)
            data = new T[size];
    }
    Array(const Array& copy) : data(0), size(copy.size)
    {
        if (size > 0)
        {
            data = new T[size];
            for (unsigned i = 0; i < size; ++i)
                setvalue(i, copy.getvalue(i));
        }
    }
    const Array& operator = (const Array& copy)
    {
        if (this == &copy)
            return *this;

        if (data != NULL)
        {
            delete []data;
            data = NULL;
        }

        size = copy.size;
        if (size > 0)
        {
            data = new T[size];
            for (unsigned i = 0; i < size; ++i)
                setvalue(i, copy.getvalue(i));
        }
    }
    ~Array()
    {
        if (data)
            delete []data;
    }
    void setvalue(unsigned index, const T& value)
    {
        if (index < size)
            data[index] = value;
    }
    T getvalue(unsigned index) const
    {
        if (index < size)
            return data[index];
        else
            return T();
    }

private:
    T* data;
    unsigned size;
};

int main()
{
    Array<int> a(10);
    Array<int> b(10);
    b = a;
    return 0;
}