pure virtual destructors in c++ Clion and VS2019

Question

I'm trying do declare pure virtual destructor, in VS2019 I'm writing like that:

    virtual ~A() = 0 {};

and it's fine, but in Clion don't accept that I'm getting the following message:

pure-specifier on function-definition virtual ~A() = 0{ };

and it forces me to write a different implementation for the function (not that it to much trouble but id like to know why is that)

Pure specifier and definition at the same time is not valid indeed. It would probably be a good idea to fill a bug report. — user7860670, Sep 25 '19 at 11:27
_in VS2019 I'm writing like that: `virtual ~A() = 0 {};` and it's fine_ That might be a native extension of MS (and not the first one I recognized). — Scheff's Cat, Sep 25 '19 at 11:34
In the declaration, `virtual ~A() = 0;` and provide an implementation after the declaration `inline A::~A() = default;` (because it is a destructor, it still needs to be provided). If the implementation is in the .cpp file, omit the `inline`. If the destructor needs to do something other than `default` provide the destructor behavior as needed. — Eljay, Sep 25 '19 at 11:40

score 5 · Accepted Answer · answered Sep 25 '19 at 11:29

5

From the C++ 20 (11.6.3 Abstract classes)

...[Note: A function declaration cannot provide both a pure-specifier and a definition — end note] [Example:

struct C {
  virtual void f() = 0 { }; // ill-formed
};

— end example]

answered Sep 25 '19 at 11:29

Vlad from Moscow

1 Answers1