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  1. #include <boost/range/numeric.hpp>
  2. #include <boost/function_output_iterator.hpp>
  3. #include <iostream>
  4. #include <string>
  5. #include <vector>
  6.  
  7. template <class Container>
  8. struct ignore_insert {
  9.     // Ignore any insertions that don't match container's type
  10.     Container& cont;
  11.     ignore_insert(Container& c) : cont(c) {}
  12.     void operator() (typename Container::value_type i) {
  13.         cont.push_back(i);
  14.     }
  15.     template <typename T>
  16.     void operator() (T) {}
  17. };
  18.  
  19. template <class Container>
  20. auto ignoreinsrtr(Container& cont) {
  21.     return boost::make_function_output_iterator(ignore_insert<Container>{cont});
  22. }
  23.  
  24. int main() {
  25.     std::vector<int> v { 0, 1, 2, 3 }; // any generic STL container
  26.     std::vector<std::string> result;
  27.     boost::adjacent_difference(v, ignoreinsrtr(result),
  28.             [](int a, int b){ return std::to_string(a+b); });
  29.     for (auto i : result)
  30.         std::cout << i << ", ";
  31.     std::cout << '\n';
  32.     return 0;
  33. }
  34.  
  35.  
Success #stdin #stdout 0s 3416KB
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https://ideone.com/sn3ELy
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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