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  1. #include <boost/range/numeric.hpp>
  2. #include <boost/function_output_iterator.hpp>
  3. #include <functional>
  4. #include <iostream>
  5.  
  6. template <class Container>
  7. auto mybackinsrtr(Container& cont) {
  8.     // Throw away the first element
  9.     return boost::make_function_output_iterator(
  10.             [&cont](auto i) -> void { 
  11.               static bool first = true;
  12.               if (first)
  13.                 first = false;
  14.               else
  15.                 cont.push_back(i);
  16.             });
  17. }
  18.  
  19.  
  20. int main() {
  21.     std::vector<int> v { 0, 1, 2, 3 }; // any generic STL container
  22.     std::vector<int> result;
  23.     boost::adjacent_difference(v, mybackinsrtr(result), std::plus<>{});
  24.     for (auto i : result) {
  25.         std::cout << i << ", ";
  26.     }
  27.     std::cout << '\n';
  28.     return 0;
  29. }
  30.  
  31.  
Success #stdin #stdout 0s 3460KB
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https://ideone.com/PpZld6
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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