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  1. /*
  2. Create an iterator class called BitBucket that just absorbs whatever you send to 
  3. it without writing it anywhere.
  4. */
  5.  
  6. #include <iostream>
  7. #include <iterator>
  8. #include <vector>
  9. #include <algorithm>
  10.  
  11. using namespace std;
  12.  
  13. template<class InputIter, class _Tp>
  14. class BitBucket : public std::iterator<
  15.     std::input_iterator_tag, _Tp, std::ptrdiff_t> {
  16.   InputIter first;
  17.   _Tp t;
  18. public:
  19.   BitBucket(InputIter begin)
  20.     : first(begin){}
  21.   BitBucket() : first(NULL) {} // End sentinel
  22.   // Prefix increment:
  23.   BitBucket& operator++() {
  24.     first++;
  25.     return *this;
  26.   }
  27.   BitBucket operator++(int) {
  28.     BitBucket b = *this;
  29.     ++first;
  30.     return b;
  31.   }  
  32.   _Tp& operator *() { return t; }
  33.   bool operator == ( const BitBucket&b ) const{ return first == b.first; } 
  34.   bool operator != ( const BitBucket&b ) const{ return !(*this==b); }
  35. };
  36.  
  37. struct RandGen {
  38.   int operator()() { return std::rand() %20; }
  39. };
  40. int main(int argc, char**argv) {
  41.   vector<int> v;
  42.   generate_n(back_inserter(v),10,RandGen());
  43.   BitBucket<vector<int>::iterator,int> b1(v.begin()),b2(v.end());
  44.   while (b1!=b2) *b1++ = 13;
  45.   copy(v.begin(),v.end(),ostream_iterator<int>(cout," "));
  46.   return 0; 
  47. }
Success #stdin #stdout 0s 5268KB
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stdin
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Standard input is empty
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3 6 17 15 13 15 6 12 9 1
https://ideone.com/7CZNWX
language:
C++ (gcc 8.3)
created:
6 days ago
visibility:
public

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