An example Analysis of the Constructor inherited by Category 11

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Suppose we have the following CRect class:

Since today's story is about constructors, other features of the CRect class are omitted. There are four constructors in this class, and you can use them as follows:

The little trouble of inheritance

For some reason, we need to inherit this class to get a new class, such as CFillRect, but we also want to construct the instance in the same way as CRect, that is, we want to use the new class like this:

Before Category 11, we can only define these four constructors again in CFillRect, and then call the corresponding functions of the base class respectively. The code is roughly as follows:

To be honest, it's a little stupid.

Inherited constructor

In the new C++ standard, derived classes only need a declaration statement to achieve the above functions:

Isn't that better?

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