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Full Discussion: Purpose of empty Class
Top Forums Programming Purpose of empty Class Post 302227986 by deepthi.s on Friday 22nd of August 2008 11:25:15 AM
Old 08-22-2008
Purpose of empty Class

class A
{};

int main()
{
A a;
}

What is the purpose of such empty classes in C++?Why is it allowed in the language specification?
 

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Validation::Class::Exporter(3pm)			User Contributed Perl Documentation			  Validation::Class::Exporter(3pm)

NAME
Validation::Class::Exporter - Simple Exporter for Validation::Class Classes VERSION
version 7.70 SYNOPSIS
package MyApp::Class; use Validation::Class; use Validation::Class::Exporter; Validation::Class::Exporter->apply_spec( routines => ['thing'], # export routines as is settings => [ ... ] # passed to the "load" method, see Validation::Class ); has foo => 0; bld sub { shift->foo(1); }; sub thing { my $args = pop; my $class = shift || caller; # routine as a keyword $class->{config}->{THING} = [$args]; }; package MyApp::Example; use MyApp::Class; thing ['this' => 'that']; package main; my $eg = MyApp::Example->new; # we have lift-off!!! DESCRIPTION
This module (while experimental) encapsulates the exporting of keywords and routines. It applies the Validation::Class framework along with any keyword routines and/or sub-routines specified with the apply_spec() method. It does this by simply by copying the spec into the calling class. To simplify writing exporter modules, "Validation::Class::Exporter" also imports "strict" and "warnings" into your exporter module, as well as into modules that use it. METHODS
apply_spec When you call this method, "Validation::Class::Exporter" builds a custom "import" method on the calling class. The "import" method will export the functions you specify, and can also automatically export "Validation::Class" making the calling class a Validation::Class derived class. This method accepts the following parameters: o routines => [ ... ] This list of function names only will be exported into the calling class exactly as is, the functions can be used traditionally or as keywords so their parameter handling should be configured accordingly. o settings => [ ... ] This list of key/value pair will be passed to the load method imported from "Validation::Class::load" and will be applied on the calling class. This approach affords you some trickery in that you can utilize the load method to apply the current class' configuration to the calling class' configuration, etc. AUTHOR
Al Newkirk <anewkirk@ana.io> COPYRIGHT AND LICENSE
This software is copyright (c) 2011 by Al Newkirk. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. perl v5.14.2 2012-06-28 Validation::Class::Exporter(3pm)
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