/usr/share/perl5/Class/MakeMethods/Evaled/Hash.pm is in libclass-makemethods-perl 1.01-5.
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Class::MakeMethods::Evaled::Hash - Typical hash methods
=head1 SYNOPSIS
package MyObject;
use Class::MakeMethods::Evaled::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');
=head1 DESCRIPTION
The Evaled::Hash subclass of MakeMethods provides a simple constructor and accessors for blessed-hash object instances.
=head2 Calling Conventions
When you C<use> this package, the method names you provide
as arguments cause subroutines to be generated and installed in
your module.
See L<Class::MakeMethods::Standard/"Calling Conventions"> for a summary, or L<Class::MakeMethods/"USAGE"> for full details.
=head2 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 L<"METHOD GENERATOR TYPES">.
See L<Class::MakeMethods::Standard/"Declaration Syntax"> for more
syntax information.
=cut
package Class::MakeMethods::Evaled::Hash;
$VERSION = 1.000;
use strict;
use Class::MakeMethods::Evaled '-isasubclass';
########################################################################
=head1 METHOD GENERATOR TYPES
=head2 new - Constructor
For each method name passed, returns a subroutine with the following characteristics:
=over 4
=item *
If called as a class method, makes a new hash and blesses it into that class.
=item *
If called on a hash-based instance, makes a copy of it and blesses the copy into the same class as the original instance.
=item *
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.
=item *
Returns the new instance.
=back
Sample declaration and usage:
package MyObject;
use Class::MakeMethods::Evaled::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' );
=cut
sub new {
(shift)->evaled_methods( q{
sub __NAME__ {
my $callee = shift;
if ( ref $callee ) {
bless { %$callee, @_ }, ref $callee;
} else {
bless { @_ }, $callee;
}
}
}, @_ )
}
########################################################################
=head2 scalar - Instance Accessor
For each method name passed, uses a closure to generate a subroutine with the following characteristics:
=over 4
=item *
Must be called on a hash-based instance.
=item *
Uses the method name as a hash key to access the related value for each instance.
=item *
If called without any arguments returns the current value.
=item *
If called with an argument, stores that as the value, and returns it,
=back
Sample declaration and usage:
package MyObject;
use Class::MakeMethods::Evaled::Hash (
scalar => 'foo',
);
...
# Store value
$obj->foo('Foozle');
# Retrieve value
print $obj->foo;
=cut
sub scalar {
(shift)->evaled_methods( q{
sub __NAME__ {
my $self = shift;
if ( scalar @_ ) {
$self->{'__NAME__'} = shift;
} else {
$self->{'__NAME__'};
}
}
}, @_ )
}
########################################################################
=head2 array - Instance Ref Accessor
For each method name passed, uses a closure to generate a subroutine with the following characteristics:
=over 4
=item *
Must be called on a hash-based instance.
=item *
Uses the method name as a hash key to access the related value for each instance.
=item *
The value for each instance will be a reference to an array (or undef).
=item *
If called without any arguments, returns the current array-ref value (or undef).
=item *
If called with one argument, uses that argument as an index to retrieve from the referenced array, and returns that value (or undef).
=item *
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.
=back
Sample declaration and usage:
package MyObject;
use Class::MakeMethods::Evaled::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() } = ();
=cut
sub array {
(shift)->evaled_methods( q{
sub __NAME__ {
my $self = shift;
if ( scalar(@_) == 0 ) {
return $self->{'__NAME__'};
} elsif ( scalar(@_) == 1 ) {
$self->{'__NAME__'}->[ shift() ];
} elsif ( scalar(@_) % 2 ) {
Carp::croak "Odd number of items in assigment to __NAME__";
} else {
while ( scalar(@_) ) {
my $key = shift();
$self->{'__NAME__'}->[ $key ] = shift();
}
return $self->{'__NAME__'};
}
}
}, @_ )
}
########################################################################
=head2 hash - Instance Ref Accessor
For each method name passed, uses a closure to generate a subroutine with the following characteristics:
=over 4
=item *
Must be called on a hash-based instance.
=item *
Uses the method name as a hash key to access the related value for each instance.
=item *
The value for each instance will be a reference to a hash (or undef).
=item *
If called without any arguments, returns the current hash-ref value (or undef).
=item *
If called with one argument, uses that argument as an index to retrieve from the referenced hash, and returns that value (or undef).
=item *
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.
=back
Sample declaration and usage:
package MyObject;
use Class::MakeMethods::Evaled::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() } = ();
=cut
sub hash {
(shift)->evaled_methods( q{
sub __NAME__ {
my $self = shift;
if ( scalar(@_) == 0 ) {
return $self->{'__NAME__'};
} elsif ( scalar(@_) == 1 ) {
$self->{'__NAME__'}->{ shift() };
} elsif ( scalar(@_) % 2 ) {
Carp::croak "Odd number of items in assigment to '__NAME__'";
} else {
while ( scalar(@_) ) {
$self->{'__NAME__'}->{ shift() } = shift();
}
return $self->{'__NAME__'};
}
}
}, @_ )
}
########################################################################
=head1 SEE ALSO
See L<Class::MakeMethods> for general information about this distribution.
See L<Class::MakeMethods::Evaled> for more about this family of subclasses.
=cut
1;
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