STL vector of 3 doubles?

true_atlantis · 04-22-2004, 12:52 AM

is it possible to create an STL vector of 3 doubles? i cant find much documentation of it. if so, how do you access each one seperately?? basicaly, i need to change this to a stl vector

Code:

struct Vector {
  float x;
  float y;
  float z;
};

thanks

cjp · 04-22-2004, 04:37 AM

I think that you are confused by the name vector. Your Vector struct clearly describes a three-dimensional geometric vector. Informatics-people use the word vector as a synonym for "array". Actually, the STL vector class is an array container class. If you REALLY want to implement your Vector op top of the STL vector, I'd do this:

Code:

#include <vector>

class Vector : protected std::vector<double>
{
    Vector()
    {push_back(0.0); push_back(0.0); push_back(0.0);} //allocate three elements

    double &x(){return (*this)[0];}
    double &y(){return (*this)[1];}
    double &z(){return (*this)[2];}

};

true_atlantis · 04-22-2004, 10:13 AM

no, im not confused... it is a exersize we must do for an assignment. we also had to change a simple array to an STL vector... but thanks, that will work