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#include <iostream>

#include <string>

using namespace std;

void test1(string&& a, string&& b)

{

    cout << "A:" << a << ", B:" << b <<endl;

}



void test2(const string& a, const string& b)

{

    cout << "A:" << a << ", B:" << b <<endl;

}



void test3(string& a, string& b)

{

    cout << "A:" << a << ", B:" << b <<endl;

}



int main(int argc, char *argv[] ) 

{

    test1( string("abc"), string("123") );

    test2( string("abc"), string("123") );

    // test3( string("abc"), string("123") ); //error: cannot bind non-const lvalue reference of type

    // &ref 是左值引用操作符，字面值常量属于右值，C++规定，右值不能传递给左值引用。

    return 0;

}