Add fixnum-aware macros LRETAIN, LRELEASE, LDESTROY, LAUTORELEASE, LASSIGN_COPY, and LASSIGN.

1 files changed, 33 insertions, 0 deletions

diff --git a/util.h b/util.h
index 91cd92c..fbde2b2 100644
--- a/util.h
+++ b/util.h
@@ -19,6 +19,39 @@
   }
 
 
+// Read this as “Lisp ASSIGN” etc..
+#define LASSIGN(VAR, VALUE)                             \
+  ({ LRELEASE (VAR); VAR = VALUE; LRETAIN (VAR); })
+
+#define LASSIGN_COPY(VAR, VALUE)                                \
+  ({                                                            \
+    id ___object = VALUE;                                       \
+    LRELEASE (VAR);                                             \
+    if (MLKInstanceP (___object))                               \
+      {                                                         \
+        VAR = [___object copy];                                 \
+        RETAIN (VAR);                                           \
+      }                                                         \
+    else                                                        \
+      VAR = ___object;                                          \
+  })
+
+#define LAUTORELEASE(VALUE)                                             \
+  ({ id __object = VALUE;                                               \
+     MLKInstanceP (__object) ? (id)AUTORELEASE(__object) : (id)__object; })
+
+#define LDESTROY(VAR)                           \
+  ({ LRELEASE (VAR); VAR = nil; })
+
+#define LRELEASE(VALUE)                         \
+  ({ id __object = VALUE;                       \
+     if (__object) RELEASE(__object); })
+
+#define LRETAIN(VALUE)                                                  \
+  ({ id __object = VALUE;                                               \
+     MLKInstanceP (__object) ? (id)RETAIN(__object) : (id)__object; })
+
+
 static id nullify (id value) __attribute__ ((pure, unused));
 static id denullify (id value) __attribute__ ((pure, unused));
 static id stringify (id value) __attribute__ ((pure, unused));