istream_iterator question

**Micko** · 03-14-2005

Hi,
I found this code that is supposed to enable user to enter a string of variable size from standard input by using istream_iterator. I understand how this works. Objects are extracted from an input stream and stored as string until end of file or some stream error is reached.

Code:

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>

using namespace std;

int main ()
{
	vector<string> v;
	vector<string> ::const_iterator it;

	copy(istream_iterator<string>(cin), 
		istream_iterator<string>(),
		back_inserter(v));

	for (it = v.begin(); it != v.end(); ++it)
	{
		cout<<*it<<" ";
	}
}

End of file is simulated by Ctrl-Z on Windows.
I wonder how to make that input is finished either after user press Enter
(i.e. when newline is input stream) or when eof is reached.
Is it possible and how?
I've just started to learn about STL and I'm pretty new to the concept of iterators.

Thanks for help

**hk_mp5kpdw** · 03-14-2005

Code:

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <sstream>

using namespace std;

int main ()
{
    vector<string> v;
    string temp;

    getline(cin,temp);
    stringstream str(temp);
    while( str >> temp )
        v.push_back(temp);

    copy(v.begin(),v.end(),ostream_iterator<string>(cout," "));

    return 0;

}

[edit]I simply chose to use another call to the copy function instead of the for loop for the output.[/edit]

**kuphryn** · 03-14-2005

Another possible solution is string's begin()/end() functions. That elimates the need for the vector.

Kuphryn

**Micko** · 03-14-2005

Thanks

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