How to iterate for each character in a Std::istream?

Question

In a std::string, the allocation is done so; in Chunks 128-character ^note. It takes every character from input and puts it by std::string::push_back. How can I do it?

Note - http://www.cplusplus.com/forum/general/132947/

Answer 1

I believe you must be looking for istream_iterator.

Consider a simple example:

#include <iostream>
#include <iterator>

using namespace std;

int main()
{
  istream_iterator<char> iit(cin);

  do 
  {
      cout << *iit;
      iit++;
  } 
  while (*iit != 'z'); 

  return 0;
}

If you enter a sentence in which the last character is the letter z, for example FooBarz, cout will only show FooBar disregarding z.

Another example, now using vectors, corrected:

#include <iostream>
#include <iterator>
#include <vector>

int main()
{
    std::vector <std::string> v;
    std::istream_iterator<std::string> iit(std::cin);
    v.push_back(*iit);

    for ( std::vector<std::string>::iterator i = v.begin(); i != v.end(); i++ )
    std::cout << *i << std::endl;

    return 0;
}