PHP list() II. – a nehezebbik fele

main.cpp

 #include <iostream>
 #include <string>
 #include <sstream>
+#include <vector>
+#include <tuple>
 
-template<class T>
-void unpack(std::istringstream& s, T& arg)
+template<class ...T>
+class container;
+
+template<class ...T>
+container<T...> list(T&...args);
+
+template<class ...T>
+class container
 {
-  s>>arg;
+private:
+  std::tuple<T&...> tu;
+public:
+  container(T&...args):tu{args...}{}
+  
+  template<class ...F>
+  friend container<T...> list(T&...args);
+  
+  template<int I>
+  typename std::enable_if<I==1>::type readhelper(std::vector<std::string>& s) 
+  {
+    std::istringstream is{s[I-1]}; 
+    is>>std::get<I-1>(tu);
   }
         
-template<class T>
-void unpack(std::istringstream&& s, T& arg)
+  template<int I>
+  typename std::enable_if<I!=1>::type readhelper(std::vector<std::string>& s) 
   { 
-  s>>arg;
+    readhelper<I-1>(s); 
+    std::istringstream is{s[I-1]}; 
+    is>>std::get<I-1>(tu);
   }
   
-template<class T, class ...V>
-void unpack(std::istringstream& s, T& arg , V& ...args)
+public:
+  void operator=(std::vector<std::string>&& s)
   {
-  s>>arg;
-  unpack(s,args...);
+    readhelper<std::tuple_size<decltype(tu)>::value>(s);
   }
+};
 
-template<class T, class ...V>
-void unpack(std::istringstream&& s, T& arg , V& ...args)
+template<class ...T>
+container<T...> list(T&...args)
 {
-  s>>arg;
-  unpack(s,args...);
+  return container<T...>{args...};
 }
 
 template<class ...T>
-void unpack(std::string s, T& ...args)
+std::vector<std::string> explode(std::string s)
 {
-  unpack(std::istringstream{s},args...);
+  std::vector<std::string> vec;
+  std::istringstream d{s};
+  while(d)
+  {
+    std::string st;
+    d>>st;
+    vec.push_back(st);
+  }
+  return std::move(vec);
 }
 
 int main(int argc, char **argv) {
-  int a;
-  double b;
-  std::string c;
-  unpack("3 4.5 bla", a, b, c);  // a = 3; b = 4.5;
-  std::cout<<a<<":"<<b<<":"<<c;
+  int a=0;
+  double b=0;
+  list(a, b) = explode("3 4.5");
+  std::cout<<a<<":"<<b;
   return 0;
 }
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szorg5.cdp

+{"compileCppOptions":["-std\u003dc++11"],"requirements":[]}
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