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c++stdvectorpush-back

c++ vector push_back not working

My program crashes here:

void TriangleStrip::addTriangle(Triangle t){ 
   cout << t <<endl ;
   instances.push_back(t); // problem here
}

instances is:

vector<Triangle> instances;

I call addTriangle here:

TriangleStrip* s;
int c = m.getTrianglesCount();
int i;
Triangle* triangles = m.getTriangles();
for(i=0; i<c; i++){
  s->addTriangle(triangles[i]); 
}

cout write me the triangle, but I can't put this to the vector.

What is the problem?

Solution

  • TriangleStrip* s; declares an uninitialized pointer, and dereferencing it s->addTriangle... is illegal.

    Either initialize it with new, or don't use pointers at all - in this case you don't need pointers, just have 

    TriangleStrip s;

    and

    s.addTriangle(triangles[i]);