Read a line of values
12345678910111213 | #include <vector>
#include <sstream>
#include <iterator>
int main()
{
std::istringstream stream{"4 36 72 8"};
std::vector<int> values;
std::copy(std::istream_iterator<int>{stream},
std::istream_iterator<int>{},
std::back_inserter(values));
} |
This pattern is licensed under the CC0 Public Domain Dedication.
Intent
Read a sequence of delimited values from a single line of an input stream into a standard container.
Description
On line 7, we declare a std::istringstream
as the input stream, although any other input stream could be used.
For user input, you can simply replace stream with
std::cin. We have similarly used
std::vector as an example container
(line 8).
On lines 10–12, we use the std::copy algorithm
to copy ints from the input stream to the container. This
algorithm takes iterator arguments.
To iterate over the stream, we use the
std::istream_iterator<int> type
on line 10, which internally uses operator>> to extract ints. The
default constructed std::istream_iterator<int> on line 11 denotes
the end of the stream.
We use the std::back_inserter
helper function on line 12 to create an output iterator that will
push_back elements into the given container.
