NAME Method::Assert - Ensure instance and class methods are called properly VERSION version 0.0.1 SYNOPSIS package MyClass; use Method::Assert; use Carp qw(confess); sub new { my ($class, @args) = &class_method; my $self = {}; bless $self, $class; $self->_init(@args); return $self; } sub _init { my ($self, @args) = @_; # Perl Critic prefers it this way &instance_method; # still works ... } sub get_output_filename { &instance_method; return shift->{'output_filename'}; } sub set_output_filename { my $self = &instance_method; confess("No parameter specified") unless @_; confess("File already exists") if -e $_[0]; $self->{'output_filename'} = $_[0]; return $self; } DESCRIPTION This module will export the two functions named below into the namespace of the package using it. These two functions are useful to do typical checks at the start of functions that are supposed to be either class or instance methods. Always remember to call these functions as &class_method and &instance_method, or else they will not work properly! If you call them as "class_method()" or "instance_method()" a new version of @_ will be initialized, and manipulation of @_ will not work properly. FUNCTIONS class_method Use this function to check that the sub is called as a class method. If the sub is called as a function, or as an instance method this function will die. If called in scalar context, will shift of the first argument of the @_ array and return that value. If called in list or void context it will not change @_. instance_method Use this function to check that the sub is called as an instance method. If the sub is called as a function, or as a class method this function will die. If called in scalar context, will shift of the first argument of the @_ array and return that value. If called in list or void context it will not change @_. CAVEATS The two functions can NOT be called by the fully qualified method name because they are generated as closures in the calling package's namespace during import(). Writing "use Method::Assert ()" will cause import() not to be executed, which doesn't not make sense. See the section on *import* in "perldoc -f use" for more information. SEMANTIC VERSIONING This module uses semantic versioning concepts from . SEE ALSO * Method::Signatures * Devel::Declare * MooseX::Method::Signatures * MooseX::Declare SUPPORT You can find documentation for this module with the perldoc command. perldoc Method::Assert Websites * Search CPAN * AnnoCPAN: Annotated CPAN documentation * CPAN Ratings * CPAN Forum * RT: CPAN's Bug Tracker * CPANTS Kwalitee * CPAN Testers Results * CPAN Testers Matrix * Source Code Repository The code is open to the world, and available for you to hack on. Please feel free to browse it and play with it, or whatever. If you want to contribute patches, please send me a diff or prod me to pull from your repository :) Bugs Please report any bugs or feature requests to "bug-method-assert at rt.cpan.org", or through the web interface at . I will be notified, and then you'll automatically be notified of progress on your bug as I make changes. AUTHOR Robin Smidsrød COPYRIGHT AND LICENSE This software is copyright (c) 2010 by Robin Smidsrød. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.