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implicit invokation of items/pairs iterators

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Araq 2012-01-08 01:29:10 +01:00
commit 2ae78c0cfb
6 changed files with 72 additions and 30 deletions
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21
doc/manual.txt
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@ -2328,7 +2328,7 @@ Iterators and the for statement
Syntax::
forStmt ::= 'for' symbol (comma symbol)* [comma] 'in' expr ['..' expr] ':' stmt
forStmt ::= 'for' symbol (comma symbol)* [comma] 'in' expr ':' stmt
param ::= symbol (comma symbol)* [comma] ':' typeDesc
paramList ::= ['(' [param (comma param)* [comma]] ')'] [':' typeDesc]
@ -2386,6 +2386,24 @@ as there are components in the tuple. The i'th iteration variable's type is
the type of the i'th component.
Implict items/pairs invokations
+++++++++++++++++++++++++++++++
If the for loop expression ``e`` does not denote an iterator and the for loop
has exactly 1 variable, the for loop expression is rewritten to ``items(e)``;
ie. an ``items`` iterator is implicitely invoked:
.. code-block:: nimrod
for x in [1,2,3]: echo x
If the for loop has exactly 2 variables, a ``pairs`` iterator is implicitely
invoked.
Symbol lookup of the identifiers ``items``/``pairs`` is performed after
the rewriting step, so that all overloadings of ``items``/``pairs`` are taken
into account.
Type sections
~~~~~~~~~~~~~
@ -3322,6 +3340,7 @@ strings automatically:
Dynlib pragma for import
------------------------
With the `dynlib`:idx: pragma a procedure can be imported from
a dynamic library (``.dll`` files for Windows, ``lib*.so`` files for UNIX). The
non-optional argument has to be the name of the dynamic library: