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  1. template<class input_type, class func_type>
  2. auto rfor_each(input_type&& input, func_type&& func, int) ->decltype(func(input)) 
  3. { return func(input);}
  4.  
  5. template<class input_type, class func_type>
  6. void rfor_each(input_type&& input, func_type&& func, ...) 
  7. { for(auto&& i : input) rfor_each(i, func, 0);}
  8.  
  9. #include <iostream>
  10. int main()
  11.  {
  12.  
  13.      std::cout << std::endl;
  14.      double B[3][3] = { { 1.2 } };
  15.      rfor_each(B[1], [](double&v){v = 5;}); //iterate over doubles
  16.      auto write = [](double (&i)[3]) //iterate over rows
  17.          {
  18.              std::cout << "{";
  19.              for(double d : i) 
  20.                  std::cout << d << ", ";
  21.              std::cout << "}\n";
  22.          };
  23.      rfor_each(B, write );
  24.  };
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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{1.2, 0, 0, }
{5, 5, 5, }
{0, 0, 0, }
https://ideone.com/mmApAb
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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