Thread: Something about aggregate type, apparently.

This may sound odd or just impossible...

I'm doing a lot of work with geometry-like user defined types (structures), for example

Code:

struct point2d{double x,y;};
struct point3d{double x,y,z;};

And I would be REALLY happy to be able to use syntax like this to operate on them:

Code:

point3d blah(point3d k);
{return {k.x*2,k.y*2,k.z*2};}
... ... ... ... ... ...
point3d t;
t={0,0,0};
t=blah({1,1,1});

Please notice:
>the construct in the return statement of the function
>the assignment of t
>the function call

So far I'm aware that I can write

Code:

struct point3d t={0,0,0};

According to MSDN, this is called "aggregate type initialization" and I was very happy when I found it, believing that I found some alternative syntax that would help me construct types easily. But I was wrong, the syntax doesn't work in the above examples (I exposed three situations where I was expecting it to work).
So, why doesn't it work? What do you think I should do? So far I'm using these "constructor functions" that I made:

Code:

point2d _stdcall fpoint2d(double x,double y)
{struct point2d t={x,y};
return t;}
point3d _stdcall fpoint3d(double x,double y,double z)
{struct point3d t={x,y,z};
return t;}

I'm very happy with these regarding the syntax, but ... I'm concerned that using them will slow down my calculations; and time is a problem.
Should I enhance the types to classes? Would'n that be slower? Should I use custom operators?
So, what are my options?

Here is a 3d vertex struct I use:

Code:

struct CVector3
{
public:
	
	// A default constructor
	CVector3() {}

	// This is our constructor that allows us to initialize our data upon creating an instance
	CVector3(float X, float Y, float Z) 
	{ 
		x = X; y = Y; z = Z;
	}

	// Here we overload the + operator so we can add vectors together 
	CVector3 operator+(CVector3 vVector)
	{
		// Return the added vectors result.
		return CVector3(vVector.x + x, vVector.y + y, vVector.z + z);
	}

	// Here we overload the - operator so we can subtract vectors 
	CVector3 operator-(CVector3 vVector)
	{
		// Return the subtracted vectors result
		return CVector3(x - vVector.x, y - vVector.y, z - vVector.z);
	}
	
	// Here we overload the * operator so we can multiply by scalars
	CVector3 operator*(float num)
	{
		// Return the scaled vector
		return CVector3(x * num, y * num, z * num);
	}

	// Here we overload the / operator so we can divide by a scalar
	CVector3 operator/(float num)
	{
		// Return the scale vector
		return CVector3(x / num, y / num, z / num);
	}

	CVector3 operator=(CVector3 v)
	{
		return CVector3(v.x, v.y, v.z);
	}

	float x, y, z; 						
};

You can easily write functions in the struct to do things like double your values, or whatever. When you declare a struct or class you don't put 'struct' or 'class' before you declare the specific struct or class.

When you put:

Code:

struct point3d t={0,0,0};

you just put

point3d t=(0,0,0);

If you don't want all the addition and stuff you can just delete that to save some mem, but it won't really slow it down much.

Thanks, you were helpful.