OString/OUString: move constructors and operator=

Change-Id: Icdc5f7137cca8360f116d5d4c7b0bf4a4c526e1d
Reviewed-on: https://gerrit.libreoffice.org/20712
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>

include/rtl/string.hxx

@@ -114,6 +114,21 @@ public:
         rtl_string_acquire( pData );
     }
 
+#if defined LIBO_INTERNAL_ONLY
+    /**
+      Move constructor.
+
+      @param    str         a OString.
+      @since LibreOffice 5.2
+    */
+    OString( OString && str )
+    {
+        pData = str.pData;
+        str.pData = nullptr;
+        rtl_string_new( &str.pData );
+    }
+#endif
+
     /**
       New string from OString data.
 
@@ -281,6 +296,23 @@ public:
         return *this;
     }
 
+#if defined LIBO_INTERNAL_ONLY
+    /**
+      Move assign a new string.
+
+      @param    str         a OString.
+      @since LibreOffice 5.2
+    */
+    OString & operator=( OString && str )
+    {
+        rtl_string_release( pData );
+        pData = str.pData;
+        str.pData = nullptr;
+        rtl_string_new( &str.pData );
+        return *this;
+    }
+#endif
+
     /**
      @overload
      This function accepts an ASCII string literal as its argument.

include/rtl/ustring.hxx

@@ -130,6 +130,21 @@ public:
         rtl_uString_acquire( pData );
     }
 
+#if defined LIBO_INTERNAL_ONLY
+    /**
+      Move constructor.
+
+      @param    str         a OUString.
+      @since LibreOffice 5.2
+    */
+    OUString( OUString && str )
+    {
+        pData = str.pData;
+        str.pData = nullptr;
+        rtl_uString_new( &str.pData );
+    }
+#endif
+
     /**
       New string from OUString data.
 
@@ -386,6 +401,23 @@ public:
         return *this;
     }
 
+#if defined LIBO_INTERNAL_ONLY
+    /**
+      Move assign a new string.
+
+      @param    str         a OString.
+      @since LibreOffice 5.2
+    */
+    OUString & operator=( OUString && str )
+    {
+        rtl_uString_release( pData );
+        pData = str.pData;
+        str.pData = nullptr;
+        rtl_uString_new( &str.pData );
+        return *this;
+    }
+#endif
+
     /**
       Assign a new string from an 8-Bit string literal that is expected to contain only
       characters in the ASCII set (i.e. first 128 characters). This operator

sal/rtl/strimp.hxx

@@ -33,7 +33,7 @@
 /* ======================================================================= */
 
 /*
- * refCount is opaqueincludes 2 bit-fields;
+ * refCount is opaque and includes 2 bit-fields;
  * MSB:   'interned' - is stored in the intern hash
  * MSB-1: 'static'   - is a const / static string,
  *                     do no ref counting