If you need to pass parameters Give A’s constructor to make it work, please call it explicitly in B’s constructor:
B::B()
:A( Blah)
{
}
This will be common when A is a QObject and you want the ownership content to happen correctly, you will pass in the parent pointer in the constructor of B And pass it to A:
B::B(QObject* parent_)
:A(parent_)
{
}< /pre>This has nothing to do with Qt, it is a pure C concept.
As you may know, the classes in Qt Creator are class.h and class.cpp files Suppose we have two classes A (ah, a.cpp) and B (bh, b.cpp), B inherits A. When using B's constructor, how to use A's constructor?
The constructor is automatically called when constructing B.
If you need to pass parameters to the constructor of A to make it work, please Call it explicitly in the constructor of B:
B::B()
:A(Blah)
{
}
It will be common when A is a QObject and you want the ownership content to happen correctly, you will pass in the parent pointer in the constructor of B and pass it to A:
< p>
B::B(QObject* parent_)
:A(parent_)
{
}
This has nothing to do with Qt, it is Pure C concept.