运算符+重载的问题

[casazaft]

我学过c#的运算符重载，现在回过头学c++，发现c#的方法好像不能用 大家看一下我的代码哪里有问题，我是为了实现两个类之间能进行加法：
#include <iostream>
using namespace std;

class Three3d
{
public:
float x;
float y;
float z;
Three3d(float a,float b,float c);
Three3d operator+(Three3d left, Three3d right)
{

return Three3d(left.x+right.x,left.y+right.y,left.z+right.z);
}
void show();
};

inline Three3d::Three3d(float a,float b,float c)
{
x=a;
y=b;
z=c;
}

void Three3d::show()
{
cout<<x;
cout<<y;
cout<<z;
}

int main()
{
Three3d t1(50,20,10);
Three3d t2(10,10,5);
Three3d t3=t1+t2;
t3.show();
}

[healer_kx]

可行的,C#的我倒是不知道.但是你的参数改为传递引用比较好.

[NJHS]

等于也要重载吧！

[casazaft]

=也要重载?不会那么麻烦吧 我在devc++下就是编译不过 ....郁闷

[NJHS]

Three3d t3=t1+t2;
都是对象，不是指针

是指针可以直接赋值，对象好象不可以吧

[healer_kx]

这里不需要重载=号,它走拷贝.

[caocheng8230]

要用引用返回,不然就有问题
Three3d& operator+(Three3d left, Three3d right)
{

return Three3d(left.x+right.x,left.y+right.y,left.z+right.z);
}

[qhfu]

重载加法操作符时，如果声明为class的成员函数的话，只能有一个参数，如果要有两个参数得声明为友元函数。
修改如下：
#include <iostream>
using namespace std;

class Three3d
{
public:
float x;
float y;
float z;
Three3d(float a,float b,float c);
friend Three3d operator+(Three3d left, Three3d right);

void show();
};
Three3d operator+(Three3d left, Three3d right)
{

return Three3d(left.x+right.x,left.y+right.y,left.z+right.z);
}
inline Three3d::Three3d(float a,float b,float c)
{
x=a;
y=b;
z=c;
}

void Three3d::show()
{
cout<<x<<" ";
cout<<y<<" ";
cout<<z<<" ";
}

int main()
{
Three3d t1(50,20,10);
Three3d t2(10,10,5);
Three3d t3=t1+t2;
t3.show();
system("pause");
}

[casazaft]

谢谢 qhfu(崩溃)兄弟 ok了
也谢谢各位兄弟 呵呵