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Diffstat (limited to 'jim_tcl.txt')
| -rw-r--r-- | jim_tcl.txt | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/jim_tcl.txt b/jim_tcl.txt index bf4689c..67d5adc 100644 --- a/jim_tcl.txt +++ b/jim_tcl.txt @@ -61,6 +61,7 @@ Changes since 0.82 5. Improvements with `aio`, related to eventloop and buffering. Add `aio timeout`. 6. `socket` , `open` and `aio accept` now support '-noclose' 7. Add support for hinting with `history hints` +8. Support for `proc` statics by reference (lexical closure) rather than by value Changes between 0.81 and 0.82 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ @@ -1369,6 +1370,25 @@ has an initialiser, so it is initialised to 2. Unlike a local variable, the value of a static variable is retained across invocations of the procedure. +In addition to static variables by value, static variables may also be +defined by "reference" by using a leading "&" character. In this case, +the statics point to the original variable and when one changes, they +both change. For example, here 'a' changes changes the value of the +original 'x'. + +---- + . set x 1 + . proc a {} {&x} { + incr x + } + . a + 2 + . a + 3 + . puts $x + 3 +---- + See the `proc` command for information on how to define procedures and what happens when they are invoked. See also <<_namespaces,NAMESPACES>>. |