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manual: more documentation for the 'using' statement; closes #8565

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Araq 2018-09-03 11:51:15 +02:00
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@ -17,8 +17,7 @@ About this document
=================== ===================
**Note**: This document is a draft! Several of Nim's features may need more **Note**: This document is a draft! Several of Nim's features may need more
precise wording. This manual is constantly evolving until the 1.0 release and is precise wording. This manual is constantly evolving into a proper specification.
not to be considered as the final proper specification.
This document describes the lexis, the syntax, and the semantics of Nim. This document describes the lexis, the syntax, and the semantics of Nim.
@ -2985,6 +2984,10 @@ name ``c`` should default to type ``Context``, ``n`` should default to
proc bar(c, n, counter) = ... proc bar(c, n, counter) = ...
proc baz(c, n) = ... proc baz(c, n) = ...
proc mixedMode(c, n; x, y: int) =
# 'c' is inferred to be of the type 'Context'
# 'n' is inferred to be of the type 'Node'
# But 'x' and 'y' are of type 'int'.
The ``using`` section uses the same indentation based grouping syntax as The ``using`` section uses the same indentation based grouping syntax as
a ``var`` or ``let`` section. a ``var`` or ``let`` section.
@ -2992,6 +2995,9 @@ a ``var`` or ``let`` section.
Note that ``using`` is not applied for ``template`` since untyped template Note that ``using`` is not applied for ``template`` since untyped template
parameters default to the type ``system.untyped``. parameters default to the type ``system.untyped``.
Mixing parameters that should use the ``using`` declaration with parameters
that are explicitly typed is possible and requires a semicolon between them.
If expression If expression
------------- -------------