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8.4

How do I use istream_iterator interactively with cin?

Asked by adshelly in C++ Programming Language, Microsoft Visual C++

Tags: how, istream_iterator, use

I have a parse function that uses STL iterators:

template <class Iterator>
void Parse(Iterator first, Iterator last)
{
while (first != last)
{
string s = *(first++);
if (s=="q") return;
else DoCoolStuff(s);
}
}

it works great for lists and file iterators:

list<string> test;
test.push_back("Hello");
test.push_back("World");
Parse(test.begin(), test.end()); // this works fine

ifstream infile("test.cpp");
istream_iterator<string> file_it(infile), eof;
Parse(file_it, eof); // this works fine

but it doesn't work the way I expect if
I use this:

istream_iterator<string> con_it(cin), eoi;
cout << "Press 'q' to quit" << endl;
Parse(con_it, eoi);

My problem is that it does not return from the iterator constructor until I enter some data in the console. And after that it is always one word behind. I have to enter another word after the "q" in order to make it quit. My guess is that istream_iterator is doing some read-ahead so that it knows if it is at EOF. So it won't work when I want to enter data and get immediate results. Is there some trick to allowing input iterators to process the last entry typed?

RealQuestion:
Can someone show me how to call my
Parse() function with input from the console, so that when I hit <enter>,
it processes the most recent entry?

Thanks,
-Adam

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How do I use istream_iterator interactively with cin?

Asked by adshelly in C++ Programming Language, Microsoft Visual C++

Tags: how, istream_iterator, use

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