¿Es fácil definir una clase en Perl?

Is it easy to define a class in Perl?

It is very easy and simple to define, class in Perl is corresponding to a package of perl in its simplest form. It is most important and useful in Perl to define Perl’s object.

When used together with other constraints, the new () constraint must be specified last. The new () constraint can’t be combined with the struct and unmanaged constraints. The type argument must be or derive from the specified base class. The type argument must be or implement the specified interface.

For example, the base class constraint tells the compiler that only objects of this type or derived from this type will be used as type arguments. Once the compiler has this guarantee, it can allow methods of that type to be called in the generic class.

Constraints are specified by using the where contextual keyword. The following table lists the seven types of constraints: The type argument must be a non-nullable value type. For information about nullable value types, see Nullable value types.

Multiple inheritance often indicates a design problem, but Perl always gives you enough rope to hang yourself with if you ask for it. To declare multiple parents, you simply need to pass multiple class names to use parent: Method resolution order only matters in the case of multiple inheritance.

Because HTML::Element stores a reference to the parent element, Perl’s reference-count garbage collection doesn’t work properly with HTML::Element trees. Starting with version 5.00, HTML::Element uses weak references (if available) to prevent that problem.

(This class is part of the HTML::Tree dist.) Objects of the HTML::Element class can be used to represent elements of HTML document trees. These objects have attributes, notably attributes that designates each element’s parent and content. The content is an array of text segments and other HTML::Element objects.