wordlist2.cpp

来自「Thinking in C++ 2nd edition source code 」· C++ 代码 · 共 40 行

//: C20:WordList2.cpp
// From Thinking in C++, 2nd Edition
// at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Eliminating strtok() from Wordlist.cpp
#include <string>
#include <cstring>
#include <set>
#include <iostream>
#include <fstream>
#include <iterator>
#include "../require.h"
using namespace std;

main(int argc, char* argv[]) {
  using namespace std;
  requireArgs(argc,  2);
  ifstream in(argv[1]);
  assure(in, argv[1]);
  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"));
} ///:~