Reading from standard input one line at a time is a very common task in simple scripts, and most scripting languages make it a one-liner. For example, in Python:
for line in sys.stdin:
# preserves trailing newlines
process(line)
And in Perl:
while (<>) {
# preserves trailing newlines
process($_);
}
In C++, the task is almost as easy. Notice that C++'s std::getline function, unlike the other languages' idioms, removes the trailing newline (if any) from each line it reads:
std::string line;
while (std::getline(std::cin, line)) {
// automatically chomps trailing newlines
process(line);
}
In each of these cases, the entire input never lives in memory at once; we are indeed "streaming" the lines through our program in an efficient manner. (And the std::getline function is allocator...
