片语

Metaclass mechanism元类机制

metaclass programming元类程序设计

metaclass object元类对象

root metaclass根元类

metaclass-based基于元类

英汉例句

• Improved Select metaclass dialog (for creating metaclass extensions).

  改进的选择元类对话框(为创建元类扩展标记)。

• For example, suppose that there is a stereotype s, which extends the metaclass Actor and has an attribute named attr1.

  例如，假设存在一个原型s，它扩展了元类Actor并且有一个命名叫attr1的属性。

• Observe that if the metaclass extension was to an abstract EClass, it will not show in the list.

  注意到如果这个元类扩展以前是一个抽象的EClass，它将不会显示在这个列表中。

• As well as being a class, Duke is an instance of the metaclass Nobility — attribute lookup proceeds as with any object.

  Duke是一个类，也是元类Nobility的一个实例——属性的查找过程与其他对象一致。

• To summarize, the profile contains two stereotypes, a and B, which extend the metaclass class.

  现在总结一下，概要文件包含有两个原型，a以及b，它扩展了元类Class。

• As mentioned in the last section, decorators could not completely replace the metaclass hook since they only modify methods rather than add or delete methods.

  正如上一节中介绍的一样，decorator并不能完全取代元类挂钩，因为它们只修改了方法，而未添加或删除方法。

• The metaclass will create the class (as a new style one) and will pass it to the class initializer procedure.

  元类将创建此类(作为一个新式类)并将其传递给类初始化器过程。

• Users must understand the differences and interactions between metaclass programming and traditional object-oriented programming (under both single and multiple inheritance).

  用户必须理解元类编程和传统面向对象编程的不同点和相同点(单继承和多继承)。

• If you generate a metaclass association or a stereotype association, you need to generate the tooling or shape for the stereotyped ends.

  如果您产生了一个元类联合或者一个固定模型联合，您需要为这个固定模式终端产生工具或者形状。

• If this is not your case, skip the metaclass and make your life (and that of your users) happier.

  如果不属于这种情形，那就跳过元类，使您(和您的用户)的生活更加惬意。

• Please note that the stereotype can be applied only to the elements whose metaclass it extends.

  请注意原型仅仅可以被应用到元素下，当它的元类是扩展的。

• The next installment in this series will cover more advanced topics, such as metaclass syntax, ABCs, decorators, integer literal support, base types, and exceptions.

  本系列的下一期文章将会涵盖更高级的主题，比如元类语法、a BC、修饰符、integerliteral支持、基类型和异常。

• Many programmers are confused about the difference between a metaclass and a base class.

  许多程序员会混淆元类和基类的不同。

• The availability of metaclass attributes is not transitive; in other words, the attributes of a metaclass are available to its instances, but not to the instances of the instances.

  元类属性的可用性是不会传递的，也就是说，元类的属性是对它的实例是可用的，但是对它的实例的实例是不可用的。

• You might add a check in the metaclass code to see if the attributes were already set in a parent class, but this adds plumbing and it does not give real control on a per-class basis.

  也许会在元类代码中添加一个检查，以查看是否在父类中设置了这些属性，但是这样会增加负担，并且不会控制所有的类。

• If there is no icon defined in the profile, the icon corresponding to the metaclass extension will be used.

  如果在这个配置文件中没有定义图标，这个对应元类扩展的图标就会被使用。

• The default value of an attribute typed as a metaclass reference is null or empty collection (when the multiplicity is greater than 1).

  一个元类参考的属性类型的缺省值是null或空集合(当多样性参数大于1)。

• Code will be generated automatically for edit parts of metaclass associations and stereotype associations if you choose to create the tooling for it.

  如果您选择为它创建工具，就会自动为元类联合和固定模式联合的编辑部分自动产生代码。

• Finally, you develop a feature model (expressed in UML metaclass diagrams) for the entire product line, as shown in Figure 3.

  最后，您将为整个产品线开发一个功能模型(以uml元类关系图表示)，如图3所示。

• Properties of class type (including metaclass and stereotype associations) should have this option selected.

  类的属性(包括元类和原型的关联)应该选择这个属性。