Fix SimpleGuesser::operator=' should return 'SimpleGuesser &

Change-Id: I29205bc8db7569cf123a52dd248a9165ebaef3a3

lingucomponent/source/languageguessing/simpleguesser.cxx

@@ -95,9 +95,14 @@ SimpleGuesser::SimpleGuesser()
     h = NULL;
 }
 
-void SimpleGuesser::operator=(SimpleGuesser& sg){
+SimpleGuesser& SimpleGuesser::operator=(const SimpleGuesser& sg){
+    // Check for self-assignment!
+    if (this == &sg)      // Same object?
+      return *this;        // Yes, so skip assignment, and just return *this.
+
     if(h){textcat_Done(h);}
     h = sg.h;
+    return *this;
 }
 
 SimpleGuesser::~SimpleGuesser()

lingucomponent/source/languageguessing/simpleguesser.hxx

@@ -37,10 +37,10 @@ public:
     /**inits the object with conf file "./conf.txt"*/
     SimpleGuesser();
 
-    /** Compares the current Simpleguesser with an other
-     * @param SimpleGuesser& sg the other guesser to compare
+    /**
+     * @param SimpleGuesser& sg the other guesser
      */
-    void operator=(SimpleGuesser& sg);
+    SimpleGuesser& operator=(const SimpleGuesser& sg);
 
     /**
      * destroy the object