OCCT CDL用户指南6.6.0：树结构详解

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"本文档是关于Component Description Language (CDL)的学习资料，专为Open CASCADE (CAS.CADE)软件工厂中的树结构设计提供详细描述。版本为6.6.0，发布于2013年4月，版权归OpenCASCADES.A.S所有。根据协议，用户可以无限制地在全球范围内复制和分发这份完整文档，但必须保留版权声明和许可通知，确保信息的完整性和不涉及法律风险。 CDL是一种专门的语言，用于描述软件组件及其相互关系，它是Open CASCADE Technology的核心组成部分。通过学习这个语言，开发者能够精确地定义和管理复杂的几何模型、数据结构和行为，适用于机械设计、CAD系统以及其他依赖于几何模型处理的应用领域。文档强调，尽管用户指南提供了全面的指导，但它可能并不全面，存在部分不完整性以及个别错误，尤其是在示例、样本等内容中。Open CASCADES.A.S对此类问题不承担任何责任，并提醒用户在使用过程中可能需要结合实际操作经验和官方技术支持。对于想要深入理解并掌握CDL的人来说，这份用户指南是必不可少的学习资源。它将引导读者了解如何编写、解析和维护CDL描述，包括如何定义组件接口、属性、行为和约束，以及如何在设计和开发过程中利用CDL进行有效的协作与集成。阅读和理解CDL文档对于提高在Open CASCADE Technology环境中工作的效率至关重要，但使用者应意识到其可能存在的局限性，并在必要时查阅最新版本的文档或寻求专业帮助。"

2. Introduction to CDL

As seen above, you implement data types using classes. However, classes not only

define their data representation and methods available for their instances, but they

also define how the instances will be manipulated:

• A data type manipulated by value contains the instance itself.

• A data type manipulated by handle contains a reference to the instance.

The most obvious examples of data types manipulated by value are the predefined

primitive types: Boolean, Character, Integer, Real ...

A variable of a data type manipulated by handle, which is not attached to an object,

is said to be null. To reference an object, you need to instantiate the class with one

of its constructors. This is done in C++ as in the following syntax:

Example

Handle(myClass) m = new myClass;

2. 2. 3 Persistence

An object is called persistent if it can be permanently stored. In other words, you

can use the object again at a later date, both in the application, which created it, and

in another application.

In order to make an object persistent, you need to declare it in CDL as inheriting

from the Persistent class, or to have one of its parent classes inheriting from the

Persistent class.

Note that the classes inheriting from the Persistent class are handled by reference.

Example

class Watch inherits Persistent

In this example, building the application, you add the Watch class to the

corresponding schema of data types.

If, running the application, you instantiate an object of the Watch class, you have the

possibility of storing it in a file.

You cannot store objects instantiated from classes, which inherit from the Storable

class. However, you can store them as fields of an object, which inherits from

Persistent.

Note that the objects inheriting from Storable are handled by value.

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