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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. template <typename RAI>
  5. std::string string_join(RAI begin, RAI end, std::string delimiter) {
  6.     if (begin == end) { return ""; }
  7.     std::string joint = std::to_string(*begin);
  8.     ++begin;
  9.     for (; begin != end; begin++) {
  10.         joint += delimiter + std::to_string(*begin);
  11.     }
  12.     return joint;
  13. }
  14.  
  15. template <int depth>
  16. struct string_join_recursive {
  17.     template <typename RAI>
  18.     std::string operator()(RAI iterator, RAI end, const std::string *delimiters) const {
  19.         if (iterator == end) { return ""; }
  20.         std::string joint = string_join_recursive<depth-1>()(std::begin(*iterator), std::end(*iterator), delimiters+1);
  21.         for (++iterator; iterator != end; ++iterator) {
  22.             joint += *delimiters + string_join_recursive<depth-1>()(std::begin(*iterator), std::end(*iterator), delimiters+1);
  23.         }
  24.         return joint;
  25.     }
  26. };
  27.  
  28. template <>
  29. struct string_join_recursive<1> {
  30.     template <typename RAI>
  31.     std::string operator()(RAI iterator, RAI end, const std::string *delimiters) const {
  32.         return string_join(iterator, end, *delimiters);
  33.     }
  34. };
  35.  
  36. int main() {
  37.     const std::vector<std::vector<std::vector<int>>> v = {{{1, 2, 3}, {4, 5, 6}}, {{7, 8}, {}, {9, 10, 11}}};
  38.     const std::string delimiters[3] = {"\n", ";", ","};
  39.     std::cout << string_join_recursive<3>()(v.begin(), v.end(), delimiters) << std::endl;
  40. }
  41.  
Success #stdin #stdout 0s 15248KB
comments (?)
stdin 
Standard input is empty
stdout 
1,2,3;4,5,6
7,8;;9,10,11
https://ideone.com/rsPHjY
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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