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Overload Operator Quick Help!!

Started by Broni Jun 5, 2002 at 5:45 AM 3 replies 350+ views

Original Post

Jun 5, 2002 at 5:45 AM

Hi. I''m currently developing a 3d engine, an i''m working on the collision dectection. For one piece of the test, i need to be able to return 2 points of intersection between a line segment and two planes. I have developed a CPlane and CVector3D class, but i want to be able to return a two CVector3D object from my function

  
CPlane::RayIntersection(CVector3D& vec, CVector3D& vec2,CPlane Plane)
{
.....blah;
//I calulate the dot product and find the points of intersection.

.....blah;
return (points)

At the moment I''am able to return one point but how would i return my next point without using "&&"?? Thanks Broni

parklife

Jun 5, 2002 at 5:51 AM

i don''t know, but maybe you should use reference parameters to the function instead, and let them recieve the points

CPlane::RayIntersection(CVector3D& vec, CVector3D& vec2,CPlane Plane, CVector3D &point1, CVector3D &point2);

I guess you _could_ return an array of some sort, or a struct containing two points, but i can''t see the point of doing that, as you wouldn''t be able to use the return value directly.

Kippesoep

Jun 5, 2002 at 5:56 AM

AFAIK, there''s no quick and easy way to do it. One way would be to return a vector:

  
std::vector <CVector3D> CPlane::RayIntersection (...)
{
  std::vector <CVector3D> local;
  //blabla

  local.push_back (result1);
  local.push_back (result2);
  return local;
}

Of course, you should make a typedef for "std::vector <CVector3D>" and use that.

Another would be simply to have two reference parameters:

  
void CPlane::RayIntersection (..., CVector3D &result1, CVector3D &result2)
{
  //blabla

  result1 = ...;
  result2 = ...;
}

I think that for a constant number of results, the latter is preferable stylistically (not to mention performance-wise).

Broni

Author

Broni

Jun 5, 2002 at 6:30 AM

Thanks to both of you for your quick responses. I like that second method of passing reference parameters. It worked well.

Again Thank you.

ArchMiffo

Jun 5, 2002 at 2:57 PM

You could also return a pair: std:: Pair < CVector3D,CVector3D >

[edited by - archmiffo on June 5, 2002 3:58:52 PM]

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