Constructor inheritance with classes of the same name

Question

I want to inherit the constructor of the base class, but don't compile. How can I solve this problem without changing the class name?

class MyClass
{
public:
    class A
    {

    };
};

class MyClass2 : MyClass
{
public:
    class A : MyClass::A
    {
        //error: expected nested-name-specifier before ‘namespace’
        using (MyClass::A)::(MyClass::A);
    };
};

@uneven_mark thanks problem solved =) – Parminder Singh Nov 08 '19 at 14:59 — Parminder Singh, Nov 08 '19 at 14:59

walnut · Accepted Answer · 2019-11-08T15:01:37.307

2

using MyClass::A::A;

The constructor is referred to by a qualified name to the base class from which it should be imported, i.e. MyClass::A, and then again the class name to refer to the constructor, but only the class name, not a qualified name, i.e. A.

edited Nov 08 '19 at 15:01

answered Nov 08 '19 at 15:00

walnut

21,629
4
23
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score 1 · Answer 2 · answered Nov 08 '19 at 15:06

1

Does using MyClass::A::A; do what you want?

If you want to use method() from class MyClass::A, you have to write using MyClass::A::method;. In your case, method() is the constructor, named A().

answered Nov 08 '19 at 15:06

Bktero

722
5
15

Constructor inheritance with classes of the same name

2 Answers2