#include <iostream>
using namespace std;
 
class Test {
public:  
    Test(const string& x) {     //<<<<<<<<<<<<<<<<<< TRY WITH AND WITHOUT EXPLICIT
    	cout<<"Conversion constructor called"<<endl; 
    }
};
 
// Two overloaded functions: 
void f(Test t) {
	cout<<"Function called for a Test"<<endl; 
}
void f(string &s){
	cout<<"Function called for a string"<<endl; 
}
 
// demo
int main() {
	string hello="Hello";
	const string world="World";
	f(hello);
	f(world);  //<<<<<<<<<<< would you expect the string version to be called?
}

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