added operator==() and operator!=() to LanguageTag

Change-Id: I4f339ecaeb147a05f8882065e859902f8c14ac47

i18npool/inc/i18npool/languagetag.hxx

@@ -196,6 +196,12 @@ public:
      */
     LanguageTag &                   makeFallback();
 
+    /* Test equality of two LangageTag. */
+    bool    operator==( const LanguageTag & rLanguageTag ) const;
+
+    /* Test inequality of two LangageTag. */
+    bool    operator!=( const LanguageTag & rLanguageTag ) const;
+
 private:
 
     enum Decision

i18npool/source/languagetag/languagetag.cxx

@@ -839,4 +839,17 @@ LanguageTag & LanguageTag::makeFallback()
 }
 
 
+bool LanguageTag::operator==( const LanguageTag & rLanguageTag ) const
+{
+    // Compare full language tag strings but SYSTEM unresolved.
+    return getBcp47( false) == rLanguageTag.getBcp47( false);
+}
+
+
+bool LanguageTag::operator!=( const LanguageTag & rLanguageTag ) const
+{
+    return !operator==( rLanguageTag);
+}
+
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */