uniquelist.cpp

C++编程思想第二版第一册答案

//: C20:UniqueList.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Testing list's unique() function
#include <list>
#include <iostream>
using namespace std;

int a[] = { 1, 3, 1, 4, 1, 5, 1, 6, 1 };
const int asz = sizeof a / sizeof *a;

int main() {
  // For output:
  ostream_iterator<int> out(cout, " ");
  list<int> li(a, a + asz);
  li.unique();
  // Oops! No duplicates removed:
  copy(li.begin(), li.end(), out);
  cout << endl;
  // Must sort it first:
  li.sort();
  copy(li.begin(), li.end(), out);
  cout << endl;
  // Now unique() will have an effect:
  li.unique();
  copy(li.begin(), li.end(), out);
  cout << endl;
} ///:~