Added missing operator! to String

src/TNL/String.cpp

@@ -220,6 +220,11 @@ String :: operator bool () const
    return false;
 }
 
+bool String :: operator ! () const
+{
+   return ! operator bool();
+}
+
 bool String :: operator != ( const char* str ) const
 {
    return ! operator == ( str );

src/TNL/String.h

@@ -121,9 +121,12 @@ class String
    //! Comparison operator
    bool operator != ( const char* ) const;
  
-   //! Retyping operator
+   //! Cast to bool operator
    operator bool () const;
 
+   //! Cast to bool with negation operator
+   bool operator ! () const;
+
    //! Return length of the string
    int getLength() const;
 

src/UnitTests/StringTest.cpp

@@ -106,6 +106,16 @@ TEST( StringTest, AdditionAssignmentOperator )
    ASSERT_EQ( strcmp( string2. getString(), "stringstring2" ), 0 );
 }
 
+TEST( StringTest, CastToBoolOperator )
+{
+   String string;
+   EXPECT_TRUE( ! string );
+   EXPECT_FALSE( string );
+   string.setString( "foo" );
+   EXPECT_TRUE( string );
+   EXPECT_FALSE( ! string );
+}
+
 TEST( StringTest, strip )
 {
    EXPECT_EQ( String( "string" ).strip(), String( "string" ) );