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update documentation for closureScope and capture (#12886)

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Judd 2019-12-21 15:06:32 +08:00 • committed by Andreas Rumpf
commit e1d79d40f2
2 changed files with 8 additions and 2 deletions
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3
doc/manual.rst
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@ -3521,7 +3521,8 @@ Creating closures in loops
Since closures capture local variables by reference it is often not wanted Since closures capture local variables by reference it is often not wanted
behavior inside loop bodies. See `closureScope behavior inside loop bodies. See `closureScope
<system.html#closureScope.t,untyped>`_ for details on how to change this behavior. <system.html#closureScope.t,untyped>`_ and `capture
<sugar.html#capture.m,openArray[typed],untyped>`_ for details on how to change this behavior.
Anonymous Procs Anonymous Procs
--------------- ---------------

7
lib/system.nim
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@ -4395,7 +4395,12 @@ when defined(nimNoNilSeqs2):
template closureScope*(body: untyped): untyped = template closureScope*(body: untyped): untyped =
## Useful when creating a closure in a loop to capture local loop variables by ## Useful when creating a closure in a loop to capture local loop variables by
## their current iteration values. Example: ## their current iteration values.
##
## Note: This template may not work in some cases, use
## `capture <sugar.html#capture.m,openArray[typed],untyped>`_ instead.
##
## Example:
## ##
## .. code-block:: Nim ## .. code-block:: Nim
## var myClosure : proc() ## var myClosure : proc()