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#include <iostream>
using namespace std;
main()
{
string s="test ";
ostream & operator<<(ostream &os, string &aa);
cout<< s;
system("pause");
}
ostream &operator<<(ostream &cout, string &aa)
{
cout<< aa + "111" << endl;
return cout;
}
ostream&
operator << (ostream& os, const ClassType &object)
{
//...
os<< //...
return os;
}
#include <cstdio>
ostream &operator<<(ostream &cout, string &aa)
{
printf("enter");//测试
cout<< aa + "111" << endl;
return cout;
}