#include <iostream>

class Data {
 public:
  Data(){ }
  Data(const Data& data)            { std::cout << "  copy constructor\n";} 
  Data(Data&& data)                 { std::cout << "  move constructor\n";}
  Data& operator=(const Data& data) { std::cout << "  copy assignment\n"; return *this;}
  Data& operator=(Data&& data)      { std::cout << "  move assignment\n"; return *this;}  
};

class DataStore {
  Data data_;
 public: 
  void setData(Data data) { data_ = std::move(data); }
};

class UnmovableData {
 public:
  UnmovableData() { }
  UnmovableData(const UnmovableData& data) { std::cout << "  copy constructor\n";}
  UnmovableData& operator=(const UnmovableData& data) { std::cout << "  copy assignment\n"; return *this;}  
};

class UnmovableDataStore {
  UnmovableData data_;
 public:
  void setData(const UnmovableData& data) { data_ = data; }
};

class UncopyableData {
 public:
  UncopyableData() { } 
  UncopyableData(UncopyableData&& data) { std::cout << "  move constructor\n";}
  UncopyableData& operator=(UncopyableData&& data) { std::cout << "  move assignment\n"; return *this;}    
};

class UncopyableDataStore {
  UncopyableData data_;
 public:
  void setData(UncopyableData&& data) { data_ = std::move(data); }
};

template<class D>
class GenericDataStore {
  D data_;
 public:
  void setData(const D& data) { data_ = data; }
  void setData(D&& data) { data_ = std::move(data); }	
};

int main() {
  Data d;	
  DataStore ds;
  
  std::cout << "DataStore test:\n";
  ds.setData(d);
  
  std::cout << "DataStore test with rvalue:\n";
  ds.setData(Data{});
  
  Data d2;
  std::cout << "DataStore test with move:\n";
  ds.setData(std::move(d2));
  
  std::cout << "UnmovableDataStore test:\n";
  UnmovableData umd;
  UnmovableDataStore umds;
  umds.setData(umd);
  
  std::cout << "UncopyableDataStore test:\n";
  UncopyableData ucd;
  UncopyableDataStore ucds;
  ucds.setData(std::move(ucd));  
  
  std::cout << "GenericDataStore<Data> test:\n";
  Data d3;
  GenericDataStore<Data> gds;
  gds.setData(d3);
  
  std::cout << "GenericDataStore<UnmovableData> test:\n";
  UnmovableData umd2;
  GenericDataStore<UnmovableData> gds3;
  gds3.setData(umd2); 
  
  std::cout << "GenericDataStore<UncopyableData> test:\n";
  UncopyableData ucd2;
  GenericDataStore<UncopyableData> gds2;
  gds2.setData(std::move(ucd2));  
}