FP::Abstract::Pure - functional purity protocol
use FP::List; use Safe::Isa; my $v = list(1); # or any other data structure that implements # FP::Abstract::Pure is $v->$_isa("FP::Abstract::Pure"), 1; # but usually: use FP::Predicates; is_pure($v) # true if $v does (officially) not support mutation
Base class for all data structures that don't allow mutation (by ordinary programs), i.e. are persistent.
More precisely, those objects that don't have methods that when called make other methods non-functions.
This is alpha software! Read the status section in the package README or on the website.