Question

I would like to fill my vector<float> from command line:

more my.txt | myexe.x > result.txt

What is the best way to open the pipe in C++?
Thanks
Arman.

Answer 1

Your shell will connect the standard output of more to the standard input of myexe.x. So you can just read from std::cin, and need not worry whether the input comes from the keyboard or from some other program.

For example:

vector<float> myVec;
copy(istream_iterator<float>(cin), istream_iterator<float>(),
     back_inserter(myVec));