Thread: Txt file and data storage

You can't and you don't need to "create names" on runtime. Instead (and that is every time you wish for a way to create names with numbers appended to them) you use an array (or vector).

In my example I showed some typedefs. The second one is for a vector of vectors of Points. The point of the typedefs is that they can shorted otherwise very long typenames. Instead you could also type:

Code:

std::vector<Point> one_path;
std::vector<std::vector<Point> > lots_of_paths;

You are right about how you would access the coordinates in a single path. In a collection of paths the syntax would be similar to two-dimensional arrays:

Code:

unsigned path_no = 10;
unsigned point_no = 12;

lots_of_paths[path_no][point_no].x = 42;

Or create a reference to a single path if we need to do lots of things with it:

Code:

std::vector<Point>& interesting_path = lots_of_paths[42];
interesting_path[10].y = 3;

//because interesting_path is a reference the last line affects
//lots_of_paths[42][10].y

It's me again. lots_of_paths[0] stands for my first path, lots_of_paths[1] for second and so on (if i'm not mistaking). How can i find out the number of complete paths in lots_of_paths. Is there a way to find out number of elements in vector? And what function should i use for reading file and storing numbers? get(ch), or what? I need something that ignores spaces.