wordlist2.cpp

C语言数值算法程序大全（第二版）,课本文件

//: C07:WordList2.cpp
// From "Thinking in C++, 2nd Edition, Volume 2"
// by Bruce Eckel & Chuck Allison, (c) 2003 MindView, Inc.
// Available at www.BruceEckel.com.
// Illustrates istreambuf_iterator and insert iterators
#include <cstring>
#include <fstream>
#include <iostream>
#include <iterator>
#include <set>
#include <string>
#include "../require.h"
using namespace std;

int main(int argc, char* argv[]) {
  char* fname = "WordList2.cpp";
  if(argc > 1) fname = argv[1];
  ifstream in(fname);
  assure(in, fname);
  istreambuf_iterator<char> p(in), end;
  set<string> wordlist;
  while (p != end) {
    string word;
    insert_iterator<string> 
      ii(word, word.begin());
    // Find the first alpha character:
    while(!isalpha(*p) && p != end)
      p++;
    // Copy until the first non-alpha character:
    while (isalpha(*p) && p != end)
      *ii++ = *p++;
    if (word.size() != 0)
      wordlist.insert(word);
  } 
  // Output results:
  copy(wordlist.begin(), wordlist.end(),
    ostream_iterator<string>(cout, "\n"));
} ///:~