## weak-reference.api
#
# Weak references provide access to a value while
# still allowing it to be garbage collected.
#
# A typical application is to keep an index of all
# existing values of a particular sort (say, open
# X windows connections), while still allowing old
# values to be garbe-collected normally.
#
# The penalty for using a weak reference is that
# any access to its value may return NULL due to
# the underlying value having been garbage-collected.
#
# For production uses of this, see:
#
#
src/lib/src/finalize-g.pkg#
src/lib/compiler/back/top/highcode/highcode-uniq-types.pkg#
src/lib/x-kit/style/widget-style-g.pkg# Compiled by:
#
src/lib/std/src/standard-core.sublibapi Weak_Reference {
#
Weak_Reference(X);
make_weak_reference: X -> Weak_Reference(X);
get_normal_reference_from_weak_reference
:
Weak_Reference(X) -> Null_Or(X);
Weak_Reference';
make_weak_reference' : X -> Weak_Reference';
get_normal_reference_from_weak_reference'
:
Weak_Reference' -> Bool;
};
## COPYRIGHT (c) 1995 AT&T Bell Laboratories.
## Subsequent changes by Jeff Prothero Copyright (c) 2010-2015,
## released per terms of SMLNJ-COPYRIGHT.