From: Markus Triska <triska@metalevel.at>
Date: Tue, 16 May 2023 20:41:20 +0000 (+0200)
Subject: shorten gensym/2
X-Git-Tag: v0.9.2~123^2~19
X-Git-Url: https://git.sagredo.dev/?a=commitdiff_plain;h=43df2e2649ad6d11f4a8e0dca9774f9c338d9d9f;p=scryer-prolog.git

shorten gensym/2
---

diff --git a/src/lib/gensym.pl b/src/lib/gensym.pl
index 92cd4d1f..86e7ad5b 100644
--- a/src/lib/gensym.pl
+++ b/src/lib/gensym.pl
@@ -19,13 +19,12 @@ gensym(Base, Unique) :-
     must_be(var, Unique),
     atom_si(Base),
     gensym_key(Base, BaseKey),
-    (  bb_get(BaseKey, UniqueID0) ->
-       UniqueID is UniqueID0 + 1,
-       bb_put(BaseKey, UniqueID),
-       append_id(Base, UniqueID, Unique)
-    ;  bb_put(BaseKey, 1),
-       append_id(Base, 1, Unique)
-    ).
+    (  bb_get(BaseKey, UniqueID0) -> true
+    ;  UniqueID0 = 0
+    ),
+    UniqueID is UniqueID0 + 1,
+    append_id(Base, UniqueID, Unique),
+    bb_put(BaseKey, UniqueID).
 
 reset_gensym(Base) :-
     atom_si(Base),