chap35.lst

来自「< C++ 参考大全>>的源代码. 希望大家用得开心。」· LST 代码 · 共 90 行

listing 1
// Demonstrate insert_iterator.
#include <iostream>
#include <iterator>
#include <vector>
using namespace std;

int main()
{
  vector<int> v;
  vector<int>::iterator itr;
  int i;

  for(i=0; i<5; i++)
    v.push_back(i);

  cout << "Original array: ";
  itr = v.begin();
  while(itr != v.end())
    cout << *itr++ << " ";
  cout << endl;

  itr = v.begin();
  itr += 2; // point to element 2

  // create insert_iterator to element 2
  insert_iterator<vector<int> > i_itr(v, itr);

  // insert rather than overwrite
  *i_itr++ = 100;
  *i_itr++ = 200;

  cout << "Array after insertion: ";
  itr = v.begin();
  while(itr != v.end())
    cout << *itr++ << " ";

  return 0;
}

listing 2
// Use istream_iterator
#include <iostream>
#include <iterator>
using namespace std;

int main()
{
  istream_iterator<char> in_it(cin);

  do {
    cout << *in_it++;
  } while (*in_it != '.'); 

  return 0;
}

listing 3
// Use ostream_iterator
#include <iostream>
#include <iterator>
using namespace std;

int main()
{
  ostream_iterator<char> out_it(cout);

  *out_it = 'X';
  out_it++;
  *out_it = 'Y';
  out_it++;
  *out_it = ' ';

  char str[] = "C++ Iterators are powerful.\n";
  char *p = str;
  
  while(*p) *out_it++ = *p++;

  ostream_iterator<double> out_double_it(cout);
  *out_double_it = 187.23;  
  out_double_it++;
  *out_double_it = -102.7;  

  return 0;
}

listing 4
less<int>()