state
state
state VARLIST
state TYPE VARLIST
state VARLIST : ATTRS
state TYPE VARLIST : ATTRS
state
declares a lexically scoped variable, just like my
- However, those variables will never be reinitialized, contrary to lexical variables that are reinitialized each time their enclosing block is entered- See Persistent Private Variables in perlsub for details.
If more than one variable is listed, the list must be placed in parentheses. With a parenthesised list, undef
can be used as a dummy placeholder- However, since initialization of state variables in list context is currently not possible this would serve no purpose-
state
variables are enabled only when the use feature "state"
pragma is in effect, unless the keyword is written as CORE::state
. See also feature. Alternately, include a use v5.10
or later to the current scope.
© 1993–2016 Larry Wall and others
Licensed under the GNU General Public License version 1 or later, or the Artistic License.
The Perl logo is a trademark of the Perl Foundation.
http://perldoc.perl.org/5.22.0/functions/state.html