Question

I love how in python I can do something like:

points = [] for line in open('data.txt'):     a,b,c = map(float, line.split(','))     points += [(a,b,c)] 

Basically it’s reading a list of lines where each one represents a point in 3D space, the point is represented as three numbers separated by commas

How can this be done in C++ without too much headache?

Performance is not very important, this parsing only happens one time, so simplicity is more important.

P.S. I know it sounds like a newbie question, but believe me I’ve written a lexer in D (pretty much like C++) which involves reading some text char by char and recognizing tokens,
it’s just that, coming back to C++ after a long period of python, just makes me not wanna waste my time on such things.

Answer 1

I`d do something like this:

ifstream f('data.txt'); string str; while (getline(f, str)) {     Point p;     sscanf(str.c_str(), '%f, %f, %f\n', &p.x, &p.y, &p.z);      points.push_back(p); } 

x,y,z must be floats.

And include:

#include <iostream> #include <fstream>