What is undefined reference to main C++?
Undefined reference to main() means that your program lacks a main() function, which is mandatory for all C++ programs.
What is pure virtual destructor in C++?
Pure virtual destructor in C++ Yes, it is possible to have pure virtual destructor. This means that a derived class’ destructor will be invoked first, then base class destructor will be called.
How do you declare a virtual destructor in C++?
virtual ~Base() // Define the virtual destructor function to call the Destructor Derived function. public: Derived() // Constructor function. Base *bptr = new Derived; // A pointer object reference the Base class.
How to avoid undefined reference to destructor in C + +?
If you don’t want to do anything with your destructor, then just don’t even declare it. Also make sure you do the same thing for your constructor. It looks like you may have the same problem with it too.
Is it possible to have pure virtual destructor in C + +?
Yes, it is possible to have pure virtual destructor. Pure virtual destructor are legal in standard C++ and one of the most important thing is that if class contains pure virtual destructor it is must to provide a function body for the pure virtual destructor.
What’s the reason for the error ” undefined reference to constructor “?
What’s the reason for this? The error is generated by the linker because it can not see where the definition of the constructor is located. If you are using an IDE, you should add both .cpp files to the project so that they can be compiled together and the definition would be found by the linker.
Is there a visible implementation of the destructor?
There is no visible implementation. Do something like this: If you don’t want to do anything with your destructor, then just don’t even declare it. Also make sure you do the same thing for your constructor. It looks like you may have the same problem with it too.