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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. template<class...Ts>
  4. struct sink:std::function<void(Ts...)>{
  5.   using std::function<void(Ts...)>::function;
  6. };
  7. template<class...Ts>
  8. using source=sink<sink<Ts...>>;
  9. template<class In, class Out>
  10. using process=sink< source<In>, sink<Out> >;
  11. template<class In, class Out>
  12. sink<In> operator|( process< In, Out > a, sink< Out > b ){
  13.   return [a,b]( In in ){
  14.     a( [&in]( sink<In> s )mutable{ s(std::forward<In>(in)); }, b );
  15.   };
  16. }
  17. template<class In, class Out>
  18. source<Out> operator|( source< In > a, process< In, Out > b ){
  19.   return [a,b]( sink<Out> out ){
  20.     b( a, out );
  21.   };
  22. }
  23.  
  24. template<class In, class Mid, class Out>
  25. process<In, Out> operator|( process<In, Mid> a, process<Mid, Out> b ){
  26.   return [a,b]( source<In> in, sink<Out> out ){
  27.     a( in, b|out ); // or b( in|a, out )
  28.   };
  29. }
  30. template<class...Ts>
  31. sink<> operator|( source<Ts...> a, sink<Ts...> b ){
  32.   return[a,b]{ a(b); };
  33. }
  34. process<char, char> to_upper = []( source<char> in, sink<char> out ){
  35.   in( [&out]( char c ) { out( std::toupper(c) ); } );
  36. };
  37. process<char, char> with_new_line = []( source<char> in, sink<char> out ){
  38.   in( [&out]( char c ) { out(c); } );
  39. };
  40. source<char> hello_world = [ptr="hello world"]( sink<char> s ){
  41.   for (auto it = ptr; *it; ++it ){ s(*it); }
  42. };
  43. sink<char> print = [](char c){std::cout<<c;};
  44.  
  45. int main(){
  46.   auto prog = hello_world|to_upper|with_new_line|print;
  47.   prog();
  48.   /*string s="hello world";
  49.   for(auto&c:s){
  50.   	auto out=std::toupper(c);string t;t.push_back(out);
  51.   	cout<<t<<'\n';
  52.   }*/
  53. }
Success #stdin #stdout 0.01s 5280KB
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Standard input is empty
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HELLO WORLD
https://ideone.com/C0MaSB
language:
C++14 (clang 8.0)
created:
5 days ago
visibility:
public

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