™.. Class::MethodMaker::scalar - Online Linux Manual PageSection : 3
Updated : 2014-05-22
Source : perl v5.10.1
Note : User Contributed Perl Documentation
NAMEClass::Method::scalar − Create methods for handling a scalar value.
SYNOPSIS package MyClass;
use Class::MethodMaker
[ scalar => [qw/ a −static s /]];
sub new {
my $class = shift;
bless {}, $class;
}
package main;
my $m = MyClass−>new;
my $a, $x;
$a = $m−>a; # *undef*
$x = $m−>a_isset; # false
$a = $m−>a(1); # 1
$m−>a(3);
$x = $m−>a_isset; # true
$a = $m−>a; # 3
$a = $m−>a(5); # 5;
$m−>a_reset;
$x = $m−>a_isset; # false
DESCRIPTIONCreates methods to handle array values in an object. For a component named \*(C`x\*(C'\fR, by default creates methods \f(CW\*(C`x\*(C'\fR, \f(CW\*(C`x_reset\*(C'\fR, \f(CW\*(C`x_isset\*(C'\fR, \f(CW\*(C`x_clear\*(C'\fR. Methods available are: \*(C`*\*(C'\fI\fR $m−>a(3);
$a = $m−>a; # 3
$a = $m−>a(5); # 5;
Created by default. If an argument is provided, the component is set to that value. The method returns the value of the component (after assignment to a provided value, if appropriate). *_reset $m−>a_reset;
Created by default. Resets the component back to its default. Normally, this means that *_isset will return false, and \*(C`*\*(C'\fR will return undef. If \*(C`\-default\*(C'\fR is in effect, then the component will be set to the default value, and *_isset will return true. If \*(C`\-default_ctor\*(C'\fR is in effect, then the default subr will be invoked, and its return value used to set the value of the component, and *_isset will return true. Advanced Note: actually, defaults are assigned as needed: typically, the next time a the value of a component is read. *_isset print $m−>a_isset ? "true" : "false";
Created by default. Whether the component is currently set. This is different from being defined; initially, the component is not set (and if read, will return undef); it can be set to undef (which is a set value, which also returns undef). Having been set, the only way to unset the component is with <*_reset>. If a default value is in effect, then <*_isset> will always return true. *_clear $m−>a(5);
$a = $m−>a; # 5
$x = $m−>a_isset; # true
$m−>a_clear;
$a = $m−>a; # *undef*
$x = $m−>a_isset; # true
Created by default. A shorthand for setting to undef. Note that the component will be set to undef, not reset, so *_isset will return true. *_get package MyClass;
use Class::MethodMaker
[ scalar => [{'*_get' => '*_get'}, 'a'],
new => new, ];
package main;
my $m = MyClass−>new;
$m−>a(3);
$a = $m−>a_get; # 3
$a = $m−>a_get(5); # 3; ignores argument
$a = $m−>a_get(5); # 3; unchanged by previous call
Created on request. Retrieves the value of the component without setting (ignores any arguments passed). *_set package MyClass;
use Class::MethodMaker
[ scalar => [{'*_set' => '*_set'}, 'a'],
new => new, ];
package main;
my $m = MyClass−>new;
$m−>a(3);
$a = $m−>a_set; # *undef*
$a = $m−>a_set(5); # *undef*; value is set but not returned
$a = $m−>a; # 5
Created on request. Sets the component to the first argument (or undef if no argument provided). Returns no value. 0
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