base-2.14 > base

名前

base - Establish an ISA relationship with base classes at compile time

base - コンパイル時に基底クラスとの ISA 関係を構築する

概要

    package Baz;
    use base qw(Foo Bar);

説明

Unless you are using the fields pragma, consider this module discouraged in favor of the lighter-weight parent.

Unless you are using the fields pragma, consider this module discouraged in favor of the lighter-weight parent. (TBT)

Allows you to both load one or more modules, while setting up inheritance from those modules at the same time. Roughly similar in effect to

Allows you to both load one or more modules, while setting up inheritance from those modules at the same time. Roughly similar in effect to (TBT)

    package Baz;
    BEGIN {
        require Foo;
        require Bar;
        push @ISA, qw(Foo Bar);
    }

base employs some heuristics to determine if a module has already been loaded, if it has it doesn't try again. If base tries to require the module it will not die if it cannot find the module's file, but will die on any other error. After all this, should your base class be empty, containing no symbols, it will die. This is useful for inheriting from classes in the same file as yourself, like so:

base employs some heuristics to determine if a module has already been loaded, if it has it doesn't try again. If base tries to require the module it will not die if it cannot find the module's file, but will die on any other error. After all this, should your base class be empty, containing no symbols, it will die. This is useful for inheriting from classes in the same file as yourself, like so: (TBT)

        package Foo;
        sub exclaim { "I can have such a thing?!" }
        
        package Bar;
        use base "Foo";

If $VERSION is not detected even after loading it, <base> will define $VERSION in the base package, setting it to the string -1, set by base.pm.

If $VERSION is not detected even after loading it, <base> will define $VERSION in the base package, setting it to the string -1, set by base.pm. (TBT)

base will also initialize the fields if one of the base classes has it. Multiple inheritance of fields is NOT supported, if two or more base classes each have inheritable fields the 'base' pragma will croak. See fields, public and protected for a description of this feature.

base will also initialize the fields if one of the base classes has it. Multiple inheritance of fields is NOT supported, if two or more base classes each have inheritable fields the 'base' pragma will croak. See fields, public and protected for a description of this feature. (TBT)

The base class' import method is not called.

基底クラスの import メソッドは 呼び出されません

診断メッセージ

Base class package "%s" is empty.

base.pm was unable to require the base package, because it was not found in your path.

base.pm was unable to require the base package, because it was not found in your path. (TBT)

Class 'Foo' tried to inherit from itself

Attempting to inherit from yourself generates a warning.

自分自身を継承しようとすると警告が出ます。

    use Foo;
    use base 'Foo';

HISTORY

This module was introduced with Perl 5.004_04.

このモジュールは Perl 5.004_04 で導入されました。

注意

Due to the limitations of the implementation, you must use base before you declare any of your own fields.

実装上の制限により、独自のフィールドを宣言する 前にuse base しなければなりません。

SEE ALSO

fields