operator []= method
Implementation
@override
void operator []=(int idx, KeyPoint value) {
ref.ptr[idx].x = value.x;
ref.ptr[idx].y = value.y;
ref.ptr[idx].size = value.size;
ref.ptr[idx].angle = value.angle;
ref.ptr[idx].octave = value.octave;
ref.ptr[idx].classID = value.classID;
ref.ptr[idx].response = value.response;
}