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| author | Kaz Kylheku <kaz@kylheku.com> | 2017-03-13 06:58:26 -0700 |
|---|---|---|
| committer | Kaz Kylheku <kaz@kylheku.com> | 2017-03-13 06:58:26 -0700 |
| commit | bb0476aa11a6f4f24c16ddebcaf3917764655f45 (patch) | |
| tree | 682b02af4c42be26a8537e431eb8cbeac110ed40 /txr.1 | |
| parent | 79c1412d63835304c6c219ab985ee32edf54d851 (diff) | |
| download | txr-bb0476aa11a6f4f24c16ddebcaf3917764655f45.tar.gz txr-bb0476aa11a6f4f24c16ddebcaf3917764655f45.tar.bz2 txr-bb0476aa11a6f4f24c16ddebcaf3917764655f45.zip | |
Print method can return : to decline printing.
* struct.c (struct_inst_print): Check return value of print
method call. If it is the colon keyword, then do not return
but rather continue to the regular struct printing code.
* txr.1: Documented.
Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 18 |
1 files changed, 17 insertions, 1 deletions
@@ -24112,7 +24112,23 @@ is used. The value returned by the .code print -method is ignored. +method is significant. If the special keyword symbol +.code : +(colon) is returned, then the system will print the object +in the default way, as if no +.code print +method existed: it is understood that the method declined +the responsibility for printing the object. + +If any other value is returned, then it is understood +that the method +.code print +method accepted the responsibility for printing the object, +and the system consequently will generate into +.meta stream +any output output pertaining to +.metn object 's +representation. .coNP Method @ lambda .synb |