#include <iostream>
#include <string>
using namespace std;
string operator-(const string &left, const string &right);
string operator-=(string &left, const string &right);
int main()
{
string str("This is a test.");
string res_str;
cout << "Contents of str: " << str << "\n\n";
res_str = str - "is";
cout << res_str << "\n\n";
res_str -= "is";
cout << res_str << "\n\n";
cout << str;
return 0;
}
string operator-(const string &left, const string &right) {
string::size_type i;
string result(left);
i = result.find(right);
if(i != string::npos)
result.erase(i, right.size());
return result;
}
string operator-=(string &left, const string &right) {
string::size_type i;
i = left.find(right);
if(i != string::npos)
left.erase(i, right.size());
return left;
}
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