MString streaming work.

MString.cpp

@@ -153,6 +153,16 @@ namespace coreutils {
       memcpy(data + temp, value.c_str(), value.length());
       return *this;
    }
+
+//   MString &MString::operator<<(std::ostream (*f)(std::ostream&)) {
+   MString &MString::operator<<(std::basic_ostream<char> (*pf)(std::basic_ostream<char>&)) {
+//      int temp = length;
+//      int len = length + value.length();
+//      setSize(len);
+//      memcpy(data + temp, value.c_str(), value.length());
+      std::cout << "xxx" << std::endl;
+      return *this;
+   }
    
    void MString::insert(char ch, int offset) {
       setSize(length + 1);