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Diffstat (limited to 'Help/command/foreach.rst')
-rw-r--r-- | Help/command/foreach.rst | 45 |
1 files changed, 44 insertions, 1 deletions
diff --git a/Help/command/foreach.rst b/Help/command/foreach.rst index ae2afb2905..a01a1042c9 100644 --- a/Help/command/foreach.rst +++ b/Help/command/foreach.rst @@ -47,7 +47,7 @@ of undocumented behavior that may change in future releases. .. code-block:: cmake - foreach(loop_var IN [LISTS [<lists>]] [ITEMS [<items>]]) + foreach(<loop_var> IN [LISTS [<lists>]] [ITEMS [<items>]]) In this variant, ``<lists>`` is a whitespace or semicolon separated list of list-valued variables. The ``foreach`` @@ -82,3 +82,46 @@ yields -- X=6 -- X=7 -- X=8 + + +.. code-block:: cmake + + foreach(<loop_var>... IN ZIP_LISTS <lists>) + +In this variant, ``<lists>`` is a whitespace or semicolon +separated list of list-valued variables. The ``foreach`` +command iterates over each list simultaneously setting the +iteration variables as follows: + +- if the only ``loop_var`` given, then it sets a series of + ``loop_var_N`` variables to the current item from the + corresponding list; +- if multiple variable names passed, their count should match + the lists variables count; +- if any of the lists are shorter, the corresponding iteration + variable is not defined for the current iteration. + +.. code-block:: cmake + + list(APPEND English one two three four) + list(APPEND Bahasa satu dua tiga) + + foreach(num IN ZIP_LISTS English Bahasa) + message(STATUS "num_0=${num_0}, num_1=${num_1}") + endforeach() + + foreach(en ba IN ZIP_LISTS English Bahasa) + message(STATUS "en=${en}, ba=${ba}") + endforeach() + +yields +:: + + -- num_0=one, num_1=satu + -- num_0=two, num_1=dua + -- num_0=three, num_1=tiga + -- num_0=four, num_1= + -- en=one, ba=satu + -- en=two, ba=dua + -- en=three, ba=tiga + -- en=four, ba= |