listspecialfunctions.cpp

C++编程思想第二版第一册答案

//: C20:ListSpecialFunctions.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
#include "Noisy.h"
#include <list>
#include <iostream>
#include <algorithm>
using namespace std;
ostream_iterator<Noisy> out(cout, " ");

void print(list<Noisy>& ln, char* comment = "") {
  cout << "\n" << comment << ":\n";
  copy(ln.begin(), ln.end(), out);
  cout << endl;
}

int main() {
  typedef list<Noisy> LN;
  LN l1, l2, l3, l4;
  generate_n(back_inserter(l1), 6, NoisyGen());
  generate_n(back_inserter(l2), 6, NoisyGen());
  generate_n(back_inserter(l3), 6, NoisyGen());
  generate_n(back_inserter(l4), 6, NoisyGen());
  print(l1, "l1"); print(l2, "l2");
  print(l3, "l3"); print(l4, "l4");
  LN::iterator it1 = l1.begin();
  it1++; it1++; it1++;
  l1.splice(it1, l2);
  print(l1, "l1 after splice(it1, l2)");
  print(l2, "l2 after splice(it1, l2)");
  LN::iterator it2 = l3.begin();
  it2++; it2++; it2++;
  l1.splice(it1, l3, it2);
  print(l1, "l1 after splice(it1, l3, it2)");
  LN::iterator it3 = l4.begin(), it4 = l4.end();
  it3++; it4--;
  l1.splice(it1, l4, it3, it4);
  print(l1, "l1 after splice(it1,l4,it3,it4)");
  Noisy n;
  LN l5(3, n);
  generate_n(back_inserter(l5), 4, NoisyGen());
  l5.push_back(n);
  print(l5, "l5 before remove()");
  l5.remove(l5.front());
  print(l5, "l5 after remove()");
  l1.sort(); l5.sort();
  l5.merge(l1);
  print(l5, "l5 after l5.merge(l1)");
  cout << "\n Cleanup" << endl;
} ///:~