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list
----
.. only:: html
.. contents::
List operations.
The list subcommands ``APPEND``, ``INSERT``, ``FILTER``, ``REMOVE_AT``,
``REMOVE_ITEM``, ``REMOVE_DUPLICATES``, ``REVERSE`` and ``SORT`` may create
new values for the list within the current CMake variable scope. Similar to
the :command:`set` command, the LIST command creates new variable values in
the current scope, even if the list itself is actually defined in a parent
scope. To propagate the results of these operations upwards, use
:command:`set` with ``PARENT_SCOPE``, :command:`set` with
``CACHE INTERNAL``, or some other means of value propagation.
.. note::
A list in cmake is a ``;`` separated group of strings. To create a
list the set command can be used. For example, ``set(var a b c d e)``
creates a list with ``a;b;c;d;e``, and ``set(var "a b c d e")`` creates a
string or a list with one item in it. (Note macro arguments are not
variables, and therefore cannot be used in LIST commands.)
.. note::
When specifying index values, if ``<element index>`` is 0 or greater, it
is indexed from the beginning of the list, with 0 representing the
first list element. If ``<element index>`` is -1 or lesser, it is indexed
from the end of the list, with -1 representing the last list element.
Be careful when counting with negative indices: they do not start from
0. -0 is equivalent to 0, the first list element.
Capacity and Element access
^^^^^^^^^^^^^^^^^^^^^^^^^^^
LENGTH
""""""
::
list(LENGTH <list> <output variable>)
Returns the list's length.
GET
"""
::
list(GET <list> <element index> [<element index> ...] <output variable>)
Returns the list of elements specified by indices from the list.
Search
^^^^^^
FIND
""""
::
list(FIND <list> <value> <output variable>)
Returns the index of the element specified in the list or -1
if it wasn't found.
Modification
^^^^^^^^^^^^
APPEND
""""""
::
list(APPEND <list> [<element> ...])
Appends elements to the list.
FILTER
""""""
::
list(FILTER <list> <INCLUDE|EXCLUDE> REGEX <regular_expression>)
Includes or removes items from the list that match the mode's pattern.
In ``REGEX`` mode, items will be matched against the given regular expression.
For more information on regular expressions see also the
:command:`string` command.
INSERT
""""""
::
list(INSERT <list> <element_index> <element> [<element> ...])
Inserts elements to the list to the specified location.
REMOVE_ITEM
"""""""""""
::
list(REMOVE_ITEM <list> <value> [<value> ...])
Removes the given items from the list.
REMOVE_AT
"""""""""
::
list(REMOVE_AT <list> <index> [<index> ...])
Removes items at given indices from the list.
REMOVE_DUPLICATES
"""""""""""""""""
::
list(REMOVE_DUPLICATES <list>)
Removes duplicated items in the list.
Sorting
^^^^^^^
REVERSE
"""""""
::
list(REVERSE <list>)
Reverses the contents of the list in-place.
SORT
""""
::
list(SORT <list>)
Sorts the list in-place alphabetically.
|
