Is this a operator overloading bug?

[Tim Fang]

    Thank you for you reply.
    I have posted this to bugzilla, issue # 829.

    static opCall() works well. I have downloaded helix lib, it looks pretty 
good!

"Bill Baxter" <dnewsgroup at billbaxter.com> 
wrote:eo4r0c$25tg$1 at digitaldaemon.com...
>I have confirmed that the code below works properly in DMD 0.177 but fails 
>in DMD 0.178 (in the same way it does in 1.00), so it does look very much 
>like the NRVO is indeed the culprit.
>
> Can you file a bug about it with bugzilla?
>   http://d.puremagic.com/issues/
>
> You can get around it for now by making a constructor function (using 
> static opCall is popular), and writing your opMul as
>    return the_constructor_func(x*s, y*s, z*s);
>
> That seems to work, although I suspect that just means that it's disabling 
> the NRVO, which I guess isn't smart enough to do the optimization when the 
> return value is passed through several functions.
>
> --bb
>
> Tim Fang wrote:
>>     I am very new to D and I am trying to implement a Vector3 struct, 
>> please take a look at the code below, why the output is "nananan"? I use 
>> dmd 1.00.
>>
>> --code---------------------
>> import std.stdio;
>>
>> void main()
>> {
>>  Vector3 a;
>>  a.set(1,1,1);
>>  a = a*2;
>>  writefln(a.x, a.y, a.z);
>> }
>>
>>
>> struct Vector3
>> {
>>  float x,y,z;
>>
>>  // constructor
>>  void set(float _x, float _y, float _z)
>>  {
>>   x = _x;
>>   y = _y;
>>   z = _z;
>>  }
>>
>>  Vector3 opMul(float s)
>>  {
>>   Vector3 ret;
>>   ret.x = x*s;
>>   ret.y = y*s;
>>   ret.z = z*s;
>>   return ret;
>>  }
>> }
>