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patch 8.1.1539: not easy to define a variable and lock it

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Problem:    Not easy to define a variable and lock it.
Solution:   Add ":const".
This commit is contained in:
Bram Moolenaar
2019-06-15 15:45:06 +02:00
parent dfa97f2aed
commit 9937a05543
8 changed files with 397 additions and 53 deletions
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25
runtime/doc/eval.txt
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@@ -11598,8 +11598,31 @@ text...
No error message is given for a non-existing
variable, also without !.
If the system does not support deleting an environment
variable, it is made emtpy.
variable, it is made empty.
*:cons* *:const* *E996*
:cons[t] {var-name} = {expr1}
:cons[t] [{name1}, {name2}, ...] = {expr1}
:cons[t] [{name1}, {name2}, ...] .= {expr1}
:cons[t] [{name}, ..., ; {lastname}] = {expr1}
:cons[t] {var-name} =<< [trim] {marker}
text...
text...
{marker}
Similar to |:let|, but additionally lock the variable
after setting the value. This is the same as locking
the variable with |:lockvar| just after |:let|, thus: >
:const x = 1
< is equivalent to: >
:let x = 1
:lockvar 1 x
< This is useful if you want to make sure the variable
is not modified.
*E995*
|:const| does not allow to for changing a variable. >
:let x = 1
:const x = 2 " Error!
<
:lockv[ar][!] [depth] {name} ... *:lockvar* *:lockv*
Lock the internal variable {name}. Locking means that
it can no longer be changed (until it is unlocked).