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  1. #include <functional>
  2. #include <utility>
  3. #include <iterator>
  4. #include <memory>
  5. #include <set>
  6. #include <iostream>
  7. #include <vector>
  8.  
  9. template<typename T>
  10. struct for_each_helper_interface {
  11.   virtual ~for_each_helper_interface() {}
  12.   virtual void for_each( std::function< void(T) > const& ) = 0;
  13. };
  14. template<typename C, typename T>
  15. struct for_each_helper:for_each_helper_interface<T> {
  16.   C& c;
  17.   for_each_helper( C& in ):c(in) {}
  18.   virtual void for_each( std::function< void(T) > const& f ) override final {
  19.     for( auto&& x:c ) {
  20.       f(x);
  21.     }
  22.   }
  23. };
  24. template<typename T>
  25. struct for_each_adaptor {
  26.   std::unique_ptr<for_each_helper_interface<T>> pImpl;
  27.   void for_each( std::function< void(T) > const& f ) {
  28.     if (pImpl) {
  29.       pImpl->for_each(f);
  30.     }
  31.   }
  32.   template<typename C>
  33.   for_each_adaptor( C&& c ): pImpl( new for_each_helper<C, T>( std::forward<C>(c) ) ) {}
  34. };
  35. void print_stuff( for_each_adaptor<std::string const&> c ) {
  36.   c.for_each([&](std::string const&s){
  37.     std::cout << s << "\n";
  38.   });
  39. }
  40. int main() {
  41.   std::set<std::string> s;
  42.   s.insert("hello");
  43.   s.insert("world");
  44.   print_stuff(s);
  45.   std::vector<std::string> v;
  46.   v.push_back("hola");
  47.   v.push_back("bola");
  48.   print_stuff(v);
  49. }
  50.  
  51.  
  52.  
  53.  
Success #stdin #stdout 0s 2988KB
comments (?)
stdin
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Standard input is empty
stdout
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hello
world
hola
bola
https://ideone.com/xOqBkI
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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