codetemp-2: CObject::AssertValid()

转载于 2005-12-17 18:26:00 发布 · 120 阅读

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原文链接：http://www.cnblogs.com/shanzy/archive/2005/12/17/299229.html

在编写自定义类时，应重写AssertValid函数为自身和类的其他用户提供诊断服务。重写的AssertValid通常先调用基类的该函数，再检查派生类特有的数据成员。此函数为const函数，测试时不能改变对象状态，且不应抛出异常，而应断言是否检测到无效对象数据。

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原型：[virtual]
void CObject::AssertValid() const //说明：该成员函数只能对成员变量做"引用型"操作,不能做"加工型"操作
{
ASSERT(this != NULL);
}

MSDN：

When you write your own class, you should override the AssertValid function to provide diagnostic(诊断) services for yourself and other users of your class. The overridden AssertValid usually calls the AssertValid function of its base class before checking data members unique to the derived class.

Because AssertValid is a const function, you are not permitted to change the object state during the test. Your own derived class AssertValid functions should not throw exceptions but rather should assert whether they detect invalid object data.

DEMO：

请查看MSDN中CObject

转载于:https://www.cnblogs.com/shanzy/archive/2005/12/17/299229.html