inheriting from an interface with no constructor inheriting from a class with protected constructor

Question

Although I suspect the answer here is to refactor, I'd like to avoid that due to time constraints.

What I have is a class C, that publicly inherits from interface A, that publicly inherits from interface B, that publicly inherits from class O.

O has a protected constructor. A and B don't have a constructor (or at least I'm not defining one. Are they inherited? deleted?) C has a public constructor. Calling said constructor results in a compile error:

'B::B(void)': attempting to reference a deleted function

class C : public A {
public:
C(){};
~C(){};
}

C::C() {
this->property = value;
}

class O {
public:
virtual ~O(){};
protected:
O(){};
}

class B : public O {
public:
virtual ~B(){};
}

class A : public B {
public:
virtual ~A(){};
}

using visual studio 2015.

Again, if possible would like to avoid a major refactor. Is there quick(ish) solution?

Edit: When calling C's constructor, it's in the form of O* object = new C();

"that publicly inherits from interface A, that publicly inherits from interface A" - uh, what? A inherits from itself? — user2357112, Oct 29 '16 at 01:30
C is trying to invoke B's default constructor which is apparently deleted (Can't tell without you showing us.) If there is a way to instantiate B, you best do it explicitly in the constructor for C. — DeiDei, Oct 29 '16 at 01:36
Perhaps this is relevant? http://stackoverflow.com/questions/733360/why-do-we-not-have-a-virtual-constructor-in-c — Chemistpp, Oct 29 '16 at 01:37
@user2357112 whoops, inherits from A that inherits from B. fixed now. — jakerman999, Oct 29 '16 at 01:38
@DeiDei I haven't explicitly written constructors for A or B, but I haven't deleted them either. would they inherit from O? Would they get default c'tors? — jakerman999, Oct 29 '16 at 01:40
@jakerman999 Can you show us what A and particularly B look like? — DeiDei, Oct 29 '16 at 01:45
After fixing the grammar issues, cannot reproduce the issue. — DeiDei, Oct 29 '16 at 01:56
**−1** This is **not the real code**. Only people with strong ESP capability can farsee the details of the real code. Voted to close as lacking reproducible example. — Cheers and hth. - Alf, Oct 29 '16 at 02:36

score 0 · Answer 1 · edited May 23 '17 at 12:16

0

I believe this to be related to "default constructor cannot be referenced" in Visual Studio 2015

Work around found by giving the interfaces protected constructors. Not ideal but works, thank you all.

edited May 23 '17 at 12:16

Community

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answered Oct 29 '16 at 02:06

jakerman999

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1

inheriting from an interface with no constructor inheriting from a class with protected constructor

1 Answers1