set的使用

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#include <stdio.h>
#include <stdlib.h>
#include <set>
#include <iostream>
#include <functional>
#include <algorithm>
using namespace std;
struct ltstr{  bool operator()(const char* s1, const char* s2) const { return strcmp(s1, s2) < 0;}};
int main()
{
  const int N = 6;
  const char* a[N] = {"isomer", "ephemeral", "prosaic", "nugatory", "artichoke", "serif"};
  const char* b[N] = {"flat", "this", "artichoke","frigate", "prosaic", "isomer"};
  set<const char*, ltstr> A(a, a + N);
  set<const char*, ltstr> B(b, b + N);
  set<const char*, ltstr> C;
  cout << "Set A: ";
  copy(A.begin(), A.end(), ostream_iterator<const char*>(cout, " "));
  cout << endl;
  cout << "Set B: ";
  copy(B.begin(), B.end(), ostream_iterator<const char*>(cout, " "));
  cout << endl;
  cout << "Union: ";
  set_union(A.begin(), A.end(), B.begin(), B.end(),ostream_iterator<const char*>(cout, " "),ltstr());

cout << endl;
  cout << "Intersection: ";
  set_intersection(A.begin(), A.end(), B.begin(), B.end(),ostream_iterator<const char*>(cout, " "),ltstr());
  cout << endl;
  set_difference(A.begin(), A.end(), B.begin(), B.end(),inserter(C, C.begin()),ltstr());
  cout << "Set C (difference of A and B): ";
  copy(C.begin(), C.end(), ostream_iterator<const char*>(cout, " "));
  cout << endl;
}