fork download
copy 
  1. #include <iostream> 
  2. #include <iterator> 
  3. #include <vector>
  4. #include <algorithm>
  5.  
  6. template <class T, 
  7.           class charT = char, 
  8.           class traits = std::char_traits<charT> > 
  9. class my_infix_ostream_iterator : 
  10.     public std::iterator<std::output_iterator_tag, void, void, void, void> 
  11. { 
  12.     std::basic_ostream<charT, traits> *os;
  13.     charT const* delimiter;
  14.     size_t counter, numPerLine; 
  15.  
  16. public: 
  17.     typedef charT char_type; 
  18.     typedef traits traits_type; 
  19.     typedef std::basic_ostream<charT,traits> ostream_type; 
  20.  
  21.     my_infix_ostream_iterator(ostream_type& s, size_t numPerLine = 0, charT const *d = 0)
  22.         : os(&s), delimiter(d), numPerLine(numPerLine), counter(0) 
  23.     {} 
  24.  
  25.     my_infix_ostream_iterator& operator=(T const &item)
  26.     { 
  27.         if (counter > 0)
  28.         {
  29.             if (delimiter)
  30.                 *os << delimiter; 
  31.             if ((numPerLine > 0) && ((counter % numPerLine) == 0))
  32.                 *os << os->widen('\n');
  33.         }
  34.         *os << item;
  35.         ++counter;
  36.         return *this;
  37.     }
  38.  
  39.     my_infix_ostream_iterator& operator*() { 
  40.         return *this;
  41.     }
  42.  
  43.     my_infix_ostream_iterator& operator++() {
  44.         return *this;
  45.     }
  46.  
  47.     my_infix_ostream_iterator& operator++(int) {
  48.         return *this;
  49.     }
  50. };     
  51.  
  52. struct myClass
  53. {
  54. 	int value;
  55. };
  56.  
  57. std::ostream& operator<<(std::ostream &os, const myClass &cls)
  58. {
  59. 	os << cls.value;
  60. 	return os;
  61. }
  62.  
  63. int main()
  64. {
  65. 	std::vector<myClass> myVec = {
  66. 		{1}, {2}, {3}, {4}, {5},
  67. 		{6}, {7}, {8}, {9}, {10},
  68. 		{11}, {12}, {13}
  69. 	};
  70.  
  71. 	std::cout << "Using a for loop..." << std::endl;
  72.  
  73. 	my_infix_ostream_iterator<myClass> iter(std::cout, 5, ", ");
  74. 	for (const auto &elem : myVec) {
  75. 	    *iter++ = elem;
  76. 	}
  77.  
  78. 	std::cout << std::endl << std::endl;
  79.  
  80. 	std::cout << "Using std::copy()..." << std::endl;
  81.  
  82. 	std::copy(myVec.begin(), myVec.end(),
  83. 	    my_infix_ostream_iterator<myClass>(std::cout, 5, ", ")
  84. 	);
  85.  
  86. 	return 0;
  87. }
Success #stdin #stdout 0s 4352KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Using a for loop...
1, 2, 3, 4, 5, 
6, 7, 8, 9, 10, 
11, 12, 13

Using std::copy()...
1, 2, 3, 4, 5, 
6, 7, 8, 9, 10, 
11, 12, 13
https://ideone.com/AZwtV4
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!