MakeMethods::Basic::Global(3pm) User Contributed Perl Documentation MakeMethods::Basic::Global(3pm)

Class::MakeMethods::Basic::Global - Basic shared methods

  package MyObject;
  use Class::MakeMethods::Basic::Global (
    scalar => [ 'foo', 'bar' ],
    array => 'my_list',
    hash => 'my_index',
  );
  ....
  
  # Store and retrieve global values
  MyObject->foo('Foobar');
  print MyObject->foo();
  
  # All instances of your class access the same values
  $my_object->bar('Barbados'); 
  print $other_one->bar(); 
  
  # Array accessor
  MyObject->my_list(0 => 'Foozle', 1 => 'Bang!');
  print MyObject->my_list(1);
  
  # Hash accessor
  MyObject->my_index('broccoli' => 'Blah!', 'foo' => 'Fiddle');
  print MyObject->my_index('foo');

The Basic::Global subclass of MakeMethods provides basic accessors for data shared by an entire class, sometimes called "static" or "class data."

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.

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.

For each method name passed, uses a closure to generate a subroutine with the following characteristics:

  • May be called as a class method, or equivalently, on any object instance.
  • Stores a global value accessible only through this method.
  • If called without any arguments returns the current value.
  • 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
  MyObject->foo('Foozle');
  
  # Retrieve value
  print MyObject->foo;

For each method name passed, uses a closure to generate a subroutine with the following characteristics:

  • May be called as a class method, or equivalently, on any object instance.
  • Stores a global value accessible only through this method.
  • The value 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 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);
  
  # 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() } = ();

For each method name passed, uses a closure to generate a subroutine with the following characteristics:

  • May be called as a class method, or equivalently, on any object instance.
  • Stores a global value accessible only through this method.
  • The value 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 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');
  
  # 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 Class::MakeMethods for general information about this distribution.

See Class::MakeMethods::Basic for more about this family of subclasses.

2022-10-13 perl v5.36.0