Add undocumented MacOS-X compatibility feature.

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@26318 72102866-910b-0410-8b05-ffd578937521

Source/NSString.m

@@ -55,6 +55,7 @@
 #include "Foundation/NSAutoreleasePool.h"
 #include "Foundation/NSString.h"
 #include "Foundation/NSCalendarDate.h"
+#include "Foundation/NSDecimal.h"
 #include "Foundation/NSArray.h"
 #include "Foundation/NSCharacterSet.h"
 #include "Foundation/NSException.h"
@@ -2637,6 +2638,18 @@ handle_printf_atsign (FILE *stream,
   return NO;
 }
 
+/**
+ * Returns the string's content as a decimal.<br />
+ * Undocumented feature of Aplle Foundation.
+ */
+- (NSDecimal) decimalValue
+{
+  NSDecimal     result;
+
+  NSDecimalFromString(&result, self, nil);
+  return result;
+}
+
 /**
  * Returns the string's content as a double.  Skips leading whitespace.<br />
  * Conversion is not localised (i.e. uses '.' as the decimal separator).<br />