MakeMethods::Basic(3pm) User Contributed Perl Documentation MakeMethods::Basic(3pm)NAME
Class::MakeMethods::Basic - Make really simple methods
SYNOPSIS
package MyObject;
use Class::MakeMethods::Basic::Hash (
'new' => [ 'new' ],
'scalar' => [ 'foo', 'bar' ]
);
package main;
my $obj = MyObject->new( foo => "Foozle", bar => "Bozzle" );
print $obj->foo();
$obj->bar("Barbados");
DESCRIPTION
This document describes the various subclasses of Class::MakeMethods included under the Basic::* namespace, and the method types each one
provides.
The Basic subclasses provide stripped-down method-generation implementations.
Subroutines are generated as closures bound to each method name.
Calling Conventions
When you "use" a subclass of this package, the method declarations you provide as arguments cause subroutines to be generated and installed
in your module. You can also omit the arguments to "use" and instead make methods at runtime by passing the declarations to a subsequent
call to "make()".
You may include any number of declarations in each call to "use" or "make()". If methods with the same name already exist, earlier calls to
"use" or "make()" win over later ones, but within each call, later declarations superceed earlier ones.
You can install methods in a different package by passing "-TargetClass => package" as your first arguments to "use" or "make".
See "USAGE" in Class::MakeMethods for more details.
Declaration Syntax
The following types of declarations are supported:
o generator_type => 'method_name'
o generator_type => 'name_1 name_2...'
o generator_type => [ 'name_1', 'name_2', ...]
For a list of the supported values of generator_type, see "BASIC CLASSES" in Class::MakeMethods::Docs::Catalog, or the documentation for
each subclass.
For each method name you provide, a subroutine of the indicated type will be generated and installed under that name in your module.
Method names should start with a letter, followed by zero or more letters, numbers, or underscores.
SEE ALSO
See Class::MakeMethods for general information about this distribution.
For distribution, installation, support, copyright and license information, see Class::MakeMethods::Docs::ReadMe.
perl v5.10.1 2004-09-06 MakeMethods::Basic(3pm)
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MakeMethods::Basic::Hash(3pm) User Contributed Perl Documentation MakeMethods::Basic::Hash(3pm)NAME
Class::MakeMethods::Basic::Hash - Basic hash methods
SYNOPSIS
package MyObject;
use Class::MakeMethods::Basic::Hash (
new => 'new',
scalar => [ 'foo', 'bar' ],
array => 'my_list',
hash => 'my_index',
);
...
# Constructor
my $obj = MyObject->new( foo => 'Foozle' );
# Scalar Accessor
print $obj->foo();
$obj->bar('Barbados');
print $obj->bar();
# Array accessor
$obj->my_list(0 => 'Foozle', 1 => 'Bang!');
print $obj->my_list(1);
# Hash accessor
$obj->my_index('broccoli' => 'Blah!', 'foo' => 'Fiddle');
print $obj->my_index('foo');
DESCRIPTION
The Basic::Hash subclass of MakeMethods provides a basic constructor and accessors for blessed-hash object instances.
Calling Conventions
When you "use" this package, the method names you provide as arguments cause subroutines to be generated and installed in your module.
See "Calling Conventions" in Class::MakeMethods::Basic for a summary, or "USAGE" in Class::MakeMethods for full details.
Declaration Syntax
To declare methods, pass in pairs of a method-type name followed by one or more method names. Valid method-type names for this package are
listed in "METHOD GENERATOR TYPES".
See "Declaration Syntax" in Class::MakeMethods::Basic for more syntax information.
METHOD GENERATOR TYPES
new - Constructor
For each method name passed, returns a subroutine with the following characteristics:
o If called as a class method, makes a new hash and blesses it into that class.
o If called on a hash-based instance, makes a copy of it and blesses the copy into the same class as the original instance.
o If passed a list of key-value pairs, appends them to the new hash. These arguments override any copied values, and later arguments with
the same name will override earlier ones.
o Returns the new instance.
Sample declaration and usage:
package MyObject;
use Class::MakeMethods::Basic::Hash (
new => 'new',
);
...
# Bare constructor
my $empty = MyObject->new();
# Constructor with initial values
my $obj = MyObject->new( foo => 'Foozle', bar => 'Barbados' );
# Copy with overriding value
my $copy = $obj->new( bar => 'Bob' );
scalar - Instance Accessor
For each method name passed, uses a closure to generate a subroutine with the following characteristics:
o Must be called on a hash-based instance.
o Uses the method name as a hash key to access the related value for each instance.
o If called without any arguments returns the current value.
o If called with an argument, stores that as the value, and returns it,
Sample declaration and usage:
package MyObject;
use Class::MakeMethods::Basic::Hash (
scalar => 'foo',
);
...
# Store value
$obj->foo('Foozle');
# Retrieve value
print $obj->foo;
array - Instance Ref Accessor
For each method name passed, uses a closure to generate a subroutine with the following characteristics:
o Must be called on a hash-based instance.
o Uses the method name as a hash key to access the related value for each instance.
o The value for each instance will be a reference to an array (or undef).
o If called without any arguments, returns the current array-ref value (or undef).
o If called with one argument, uses that argument as an index to retrieve from the referenced array, and returns that value (or undef).
o If called with a list of index-value pairs, stores the value at the given index in the referenced array. If the instance's value was
previously undefined, a new array is autovivified. The current value in each position will be overwritten, and later arguments with the
same index will override earlier ones. Returns the current array-ref value.
Sample declaration and usage:
package MyObject;
use Class::MakeMethods::Basic::Hash (
array => 'bar',
);
...
# Set values by position
$obj->bar(0 => 'Foozle', 1 => 'Bang!');
# Positions may be overwritten, and in any order
$obj->bar(2 => 'And Mash', 1 => 'Blah!');
# Retrieve value by position
print $obj->bar(1);
# Direct access to referenced array
print scalar @{ $obj->bar() };
# Reset the array contents to empty
@{ $obj->bar() } = ();
hash - Instance Ref Accessor
For each method name passed, uses a closure to generate a subroutine with the following characteristics:
o Must be called on a hash-based instance.
o Uses the method name as a hash key to access the related value for each instance.
o The value for each instance will be a reference to a hash (or undef).
o If called without any arguments, returns the current hash-ref value (or undef).
o If called with one argument, uses that argument as an index to retrieve from the referenced hash, and returns that value (or undef).
o If called with a list of key-value pairs, stores the value under the given key in the referenced hash. If the instance's value was
previously undefined, a new hash is autovivified. The current value under each key will be overwritten, and later arguments with the
same key will override earlier ones. Returns the current hash-ref value.
Sample declaration and usage:
package MyObject;
use Class::MakeMethods::Basic::Hash (
hash => 'baz',
);
...
# Set values by key
$obj->baz('foo' => 'Foozle', 'bar' => 'Bang!');
# Values may be overwritten, and in any order
$obj->baz('broccoli' => 'Blah!', 'foo' => 'Fiddle');
# Retrieve value by key
print $obj->baz('foo');
# Direct access to referenced hash
print keys %{ $obj->baz() };
# Reset the hash contents to empty
@{ $obj->baz() } = ();
SEE ALSO
See Class::MakeMethods for general information about this distribution.
See Class::MakeMethods::Basic for more about this family of subclasses.
See Class::MakeMethods::Basic::Array for equivalent functionality based on blessed arrays. If all access to your object is through
constructors and accessors declared using this package, and your class will not be extensively subclassed, consider switching to
Basic::Array to minimize resource consumption.
perl v5.10.1 2004-09-06 MakeMethods::Basic::Hash(3pm)