diff options
| -rw-r--r-- | generic/tcl.h | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/generic/tcl.h b/generic/tcl.h index 36077e6..48fe062 100644 --- a/generic/tcl.h +++ b/generic/tcl.h @@ -810,9 +810,7 @@ typedef struct Tcl_Obj { * Note: clients should use Tcl_DecrRefCount() when they are finished using * an object, and should never call TclFreeObj() directly. TclFreeObj() is * only defined and made public in tcl.h to support Tcl_DecrRefCount's macro - * definition. Note also that Tcl_DecrRefCount() refers to the parameter - * "obj" twice. This means that you should avoid calling it with an - * expression that is expensive to compute or has side effects. + * definition. */ void Tcl_IncrRefCount _ANSI_ARGS_((Tcl_Obj *objPtr)); void Tcl_DecrRefCount _ANSI_ARGS_((Tcl_Obj *objPtr)); @@ -833,7 +831,12 @@ int Tcl_IsShared _ANSI_ARGS_((Tcl_Obj *objPtr)); * http://c2.com/cgi/wiki?TrivialDoWhileLoop */ # define Tcl_DecrRefCount(objPtr) \ - do { if (--(objPtr)->refCount <= 0) TclFreeObj(objPtr); } while(0) + do { \ + Tcl_Obj *obj = (objPtr); \ + if ((obj)->refCount-- < 2) { \ + TclFreeObj(obj); \ + } \ + } while(0) # define Tcl_IsShared(objPtr) \ ((objPtr)->refCount > 1) #endif |