Accelerate C++ Exercise 4-5 Questions

This time I decided to tackle the problem of reading input into a
vector, counting the number of words entered, and counting the number
of time each word was entered.

My code works, but I'm not sure about cin and the << operator
behavior. I enter a complete sentence followed by ^D (EOF) on BSD.
On windows, it's a little trickier to get the EOF with ^Z to
register. I need to enter it more than once for some reason. What
does the C++ specification say about cin behavior, or this behavior
undefined?

cin reads one word at a time, rather than the complete line. The good
news is that this makes it easier to split words, so I can populate my
vector. However, this becomes very inefficient in terms of the number
of calls I need to make. Is there a better C++ approach?

Also, I'm iterating through all most the entire vector each time
before adding a new word. Does the STL provide a better way to look
up strings? Are there string search functions within the STL such as
Boyer-Moore, or do I need to write my own implementation? I do enjoy
the operator overloading in C++.

Anyway, please provide me some feedback.

Thanks,

Brian

Here's my code:

#include <iostream>
#include <vector>

using namespace std;

struct Words {

    string word;
    int count;
};

istream&
read(istream& in, Words& record, vector<Words>& wVec) {

       bool eflag = 0;
       // add record
       if (in >> record.word) {

         if (wVec.size() == 0 ) {
           record.count = 1;
      wVec.push_back(record);
         }
         else {

             // iterate through all the words all ready pushed into the
vector
        for (vector<Words>::iterator i = wVec.begin();
             i != wVec.end(); ++i) {

        // test to see if the word has all ready been entered
        if (i->word == record.word) {
           i->count += 1;
           eflag = 1;
           break;
        }
        }
        if (eflag == 0) {
                 record.count = 1;
        wVec.push_back(record);
        }
       }
     }
     return in;
}

int
main() {

    vector<Words> wVec;
    Words record;
    int wc = 0;

    while (read(cin,record, wVec)) {
        ++wc;
    }

    cout << "number of words entered: " << wc << endl;

    // iterate through the vector and display the word and its count
    for (vector<Words>::iterator i = wVec.begin();
             i != wVec.end(); ++i) {

        cout << i->word << " " << i->count << endl;
    }

    return 0;
}

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