Passing Array to a Function

[jgeorge]

Hey Everyone,
I recently ran into a problem when passing 3 arrays into a function that is supposed to move a spacestation sprite around a planet. Any help would be greatly appreciated.

//Background.h
//
void Move(int,float[],float[],float[]);

//Background.cpp
//
void Spacestation::Move(int c, float PlanetSize[], float GlobalPlanetX[], float GlobalPlanetY[])
{
    int theta = 0;

    GlobalStationX[c] = ((PlanetSize[c] + 20) * sin(theta)) + GlobalPlanetX[c];
    GlobalStationY[c] = ((PlanetSize[c] + 20) * cos(theta)) + GlobalPlanetY[c];

    theta++;
    if (theta >= 360) {theta = 0;}
}

//Main.cpp
//
  for(int c = 0; c < 3; c++) {
     stat.CheckDraw(c, global.ViewX, global.ViewY)
     stat.Move(c, planet.PlanetSize, planet.GlobalPlanetX, planet.GlobalPlanetY);
  }

Errors-
error: no matching function for call to 'Spacestation::Move(int&, std::vector<float>&, std::vector<float>&, std::vector<float>&)'

note: candidate is:
note: void Spacestation::Move(int, float*, float*, float*)
note: no known conversion for argument 2 from 'std::vector<float>' to 'float*'

Still fairly new to coding, and I'm not sure where to go from here.
Thanks!

[helios]

PlanetSize, GlobalPlanetX, and GlobalPlanetY are all pointers to vector, so you have to access their elements with (*x)[n]. Be careful with that because the compiler will perfectly accept x[n] by itself, although it will do something entirely different from what you might otherwise expect.

[jgeorge]

Would you be able to give me a quick example to go off of? I'm still a bit confused.
Thank you

[jgeorge]

Bump for help.

[Mathhead200]

You have defined planet.PlanetSize, planet.GlobalPlanetX, and planet.GlobalPlanetY as vector<float> not float* or float[], right?

You need to right your function declaration like this instead:

void Spacestation::Move(int c, vector<float> PlanetSize, vector<float> GlobalPlanetX, vector<float> GlobalPlanetY);

//or like this if you want it to run a bit faster (I avoid the details as you said you were new.)
void Spacestation::Move(int c, const vector<float> &PlanetSize, const vector<float> &GlobalPlanetX, const vector<float> &GlobalPlanetY);

Although a vector is like an array, they are not the same thing! (And there is no way to implicitly cast a vector<T> into a T[].)

[jgeorge]

Thank you so much! That worked like a charm.