NAME

Devel::WatchVars::Tie::Scalar - scalar tie class internal to Devel::WatchVars

SYNOPSIS

None. This is an internal class.

DESCRIPTION

This internal class contains the implementation used by Devel::WatchVars for watching scalars -- or, more precisely, for watching scalar lvalues.

See the DEVEL_WATCHVARS_VERBOSE envariable for how to control trace-message verbosity.

Internal Methods

TIESCALAR CLASS, DESC, VALUE

Called when you tie a scalar variable to this package.

The watch function takes care of this for you.

FETCH INSTANCE

Called when you fetch the old value from a variable tied to this package.

STORE INSTANCE, VALUE

Called when you store a new value into a variable tied to this package.

DESTROY INSTANCE

Called upon the backing object's destruction.

The unwatch function normally takes care of this for you.

CAVEATS

Because of internal bookkeeping on these objects in part maintained by that other module, it is critical that this internal class be used only from that module's public watch and unwatch functions.

TODO

Devise a subclassing mechanism.

AUTHOR

Tom Christiansen <tchrist53147@gmail.com>.

LICENCE AND COPYRIGHT

Copyright (c) 2020 by Tom Christiansen.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.