C++ string parsing (python style)

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)]
<         


        

Answer 1

Fun with Boost.Tuples:

#include 
#include 
#include 
#include 
#include 

int main() {
    using namespace boost::tuples;
    typedef boost::tuple PointT;

    std::ifstream f("input.txt");
    f >> set_open(' ') >> set_close(' ') >> set_delimiter(',');

    std::vector v;

    std::copy(std::istream_iterator(f), std::istream_iterator(),
             std::back_inserter(v)
    );

    std::copy(v.begin(), v.end(), 
              std::ostream_iterator(std::cout)
    );
    return 0;
}

Note that this is not strictly equivalent to the Python code in your question because the tuples don't have to be on separate lines. For example, this:

1,2,3 4,5,6

will give the same output than:

1,2,3
4,5,6

It's up to you to decide if that's a bug or a feature :)