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  1. #include <iostream>
  2. #include <utility>
  3. #include <iterator>
  4.  
  5.     template<typename C, typename F>
  6.     void for_each_flat( C&& c, F&& f );
  7.  
  8.     template<typename C, typename F>
  9.     void for_each_flat_helper( C&& c, F&& f, std::true_type /*is_iterable*/ ) {
  10.       for( auto&& x : std::forward<C>(c) )
  11.         for_each_flat(std::forward<decltype(x)>(x), f);
  12.     }
  13.     template<typename D, typename F>
  14.     void for_each_flat_helper( D&& data, F&& f, std::false_type /*is_iterable*/ ) {
  15.       std::forward<F>(f)(std::forward<D>(data));
  16.     }
  17.  
  18.     namespace adl_aux {
  19.       using std::begin; using std::end;
  20.       template<typename C> decltype( begin( std::declval<C>() ) ) adl_begin(C&&);
  21.       template<typename C> decltype( end( std::declval<C>() ) ) adl_end(C&&);
  22.     }
  23.     using adl_aux::adl_begin;
  24.     using adl_aux::adl_end;
  25.  
  26.     template<typename> struct type_sink {typedef void type;};
  27.     template<typename T> using TypeSink = typename type_sink<T>::type;
  28.  
  29.     template<typename T, typename=void>
  30.     struct is_iterable:std::false_type{};
  31.     template<typename T>
  32.     struct is_iterable<T, TypeSink< decltype( adl_begin( std::declval<T>() ) ) >>:std::true_type{};
  33.  
  34.     template<typename C, typename F>
  35.     void for_each_flat( C&& c, F&& f ) {
  36.       for_each_flat_helper( std::forward<C>(c), std::forward<F>(f), is_iterable<C>() );
  37.     }        
  38.  
  39.  
  40. int main() {
  41. 	int x[2][3][4] = {0};
  42. 	for_each_flat( x, [](int y) { std::cout << y << "\n"; });
  43. 	// your code goes here
  44. 	return 0;
  45. }
Success #stdin #stdout 0s 3296KB
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https://ideone.com/gkl024
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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