#include <iostream>
#include <string>
 
using namespace std;
 
void func(string &&a) { cout << "#1" << endl; }
void func(const string &&a) { cout << "#2" << endl; }
void func(int &&a) { cout << "#3" << endl; }
void func(const int &&a) { cout << "#4" << endl; }
 
int main()
{
  func(string("1"));                // call func(string &&) 
  func((const string)string("1"));  // call func(const string &&)
  func(1);                          // call func(int &&)
  func((const int)1);               // call func(int &&) not func(const int &&)
 
  return 0;
}

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