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| author | dkf <donal.k.fellows@manchester.ac.uk> | 2021-04-25 20:21:07 (GMT) |
|---|---|---|
| committer | dkf <donal.k.fellows@manchester.ac.uk> | 2021-04-25 20:21:07 (GMT) |
| commit | 9bf722e8da25eb28ed58fe97f941f4badaa3af36 (patch) | |
| tree | b5b57dca08c205c06c32f5d8701ff49c1ed0d36c /doc/TraceVar.3 | |
| parent | 5003483b1d2f1aec9e404ab053ca9b00da9f087a (diff) | |
| download | tcl-9bf722e8da25eb28ed58fe97f941f4badaa3af36.zip tcl-9bf722e8da25eb28ed58fe97f941f4badaa3af36.tar.gz tcl-9bf722e8da25eb28ed58fe97f941f4badaa3af36.tar.bz2 | |
Documenting our reference count management
Diffstat (limited to 'doc/TraceVar.3')
| -rw-r--r-- | doc/TraceVar.3 | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/doc/TraceVar.3 b/doc/TraceVar.3 index 82aa7b8..7751cf7 100644 --- a/doc/TraceVar.3 +++ b/doc/TraceVar.3 @@ -359,6 +359,14 @@ Traces on a variable are always removed whenever the variable is deleted; the only time \fBTCL_TRACE_DESTROYED\fR is not set is for a whole-array trace invoked when only a single element of an array is unset. +.SH "REFERENCE COUNT MANAGEMENT" +.PP +When a \fIproc\fR callback is invoked, and that callback was installed with +the \fBTCL_TRACE_RESULT_OBJECT\fR flag, the result of the callback is a +Tcl_Obj reference when there is an error. The result will have its reference +count decremented once when no longer needed, or may have additional +references made to it (e.g., by setting it as the interpreter result with +\fBTcl_SetObjResult\fR). .SH BUGS .PP Array traces are not yet integrated with the Tcl \fBinfo exists\fR command, |