Provided by: libclass-makemethods-perl_1.01-7_all 
NAME
Class::MakeMethods::Basic::Array - Basic array methods
SYNOPSIS
package MyObject;
use Class::MakeMethods::Basic::Array (
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::Array subclass of MakeMethods provides a basic constructor and accessors for blessed-array
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.
About Positional Accessors
Each accessor method claims the next available spot in the array to store its value in.
The mapping between method names and array positions is stored in a hash named %FIELDS in the target
package. When the first positional accessor is defined for a package, its %FIELDS are initialized by
searching its inheritance tree.
Caution: Subclassing packages that use positional accessors is somewhat fragile, since you may end up
with two distinct methods assigned to the same position. Specific cases to avoid are:
• If you inherit from more than one class with positional accessors, the positions used by the two sets
of methods will overlap.
• If your superclass adds additional positional accessors after you declare your first, they will
overlap yours.
METHOD GENERATOR TYPES
new - Constructor
For each method name passed, returns a subroutine with the following characteristics:
• If called as a class method, makes a new array and blesses it into that class.
• If called on an array-based instance, makes a copy of it and blesses the copy into the same class as
the original instance.
• If passed a list of method-value pairs, calls each named method with the associated value as an
argument.
• Returns the new instance.
Sample declaration and usage:
package MyObject;
use Class::MakeMethods::Basic::Array (
new => 'new',
);
...
# Bare constructor
my $empty = MyObject->new();
# Constructor with initial sequence of method calls
my $obj = MyObject->new( foo => 'Foozle', bar => 'Barbados' );
# Copy with overriding sequence of method calls
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:
• Must be called on an array-based instance.
• Determines the array position associated with the method name, and uses that as an index into each
instance to access the related value.
• If called without any arguments returns the current value (or undef).
• If called with an argument, stores that as the value, and returns it,
Sample declaration and usage:
package MyObject;
use Class::MakeMethods::Basic::Array (
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:
• Must be called on an array-based instance.
• Determines the array position associated with the method name, and uses that as an index into each
instance to access the related value.
• The value for each instance will be a reference to an array (or undef).
• If called without any arguments, returns the current array-ref value (or undef).
• If called with one argument, uses that argument as an index to retrieve from the referenced array,
and returns that value (or undef). If the single argument is an array ref, then a slice of the
referenced array is returned.
• 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::Array (
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);
# Retrieve slice of values by position
print join(', ', $obj->bar( [0, 2] ) );
# 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:
• Must be called on an array-based instance.
• Determines the array position associated with the method name, and uses that as an index into each
instance to access the related value.
• The value for each instance will be a reference to a hash (or undef).
• If called without any arguments, returns the current hash-ref value (or undef).
• If called with one argument, uses that argument as an index to retrieve from the referenced hash, and
returns that value (or undef). If the single argument is an array ref, then a slice of the referenced
hash is returned.
• 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::Array (
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');
# Retrieve slice of values by position
print join(', ', $obj->baz( ['foo', 'bar'] ) );
# 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.
perl v5.36.0 2022-10-13 MakeMethods::Basic::Array(3pm)