Issue 4418/1 add boolean-or-number? predicate

[lilypond.git] / scm / c++.scm

diff --git a/scm/c++.scm b/scm/c++.scm
index ba38d5a05738e1b42cd4b94d64f860d91c17fbf1..badac67e5ca6f3a5ba3613edf46747b191ecbc38 100644 (file)
--- a/scm/c++.scm
+++ b/scm/c++.scm
@@ -54,6 +54,9 @@
   (and (pair? x)
        (ly:moment? (car x)) (ly:moment? (cdr x))))
 
+(define-public (boolean-or-number? x)
+  (or (boolean? x) (number? x)))
+
 (define-public (boolean-or-symbol? x)
   (or (boolean? x) (symbol? x)))