Private inheritance is a form of inheritance is which the public and protected portion of the base class becomes private in the derived class and the derived class has no access to the private members and methods of the base class.
Questions tagged [private-inheritance]
63 questions
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why name publicizing is there when we want to inherit the base class privately?
Generally, we wish to use private inheritance to hide the implementation details to the base class. If this is true,
1) Why is the name publicizing feature is there again ? Is it only for language completeness or is there any practical usage…
Bharadwaj Gali
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1
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1 answer
typecast operator in private base
I found something I consider strange behaviour in C++: a typecast operator in a private base class is confusing the compiler when trying to resolve an implicit cast:
#include
struct Base
{
#ifdef ENABLE
operator bool () const { return…
Matei David
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Object slicing in private inheritance
Why object slicing does not takes place in private inheritance? Static_cast gives error in such cases?
I understand that the private inheritance does not hold “is - a” relationship between its inheritance classes. Does this has something to do with…
Bhupesh Pant
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need design help using private inheritance
I have a problem with the following situation: a library (CardReader) implements the ISO7816 protocol and communicates with a smart card (implemented by me).
I have to implement a proprietary protocol that use this library.
In CardReader there are…
Elvis Dukaj
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Why does private inheritance increase the probability, as compared to composition, that someone will break my code?
The author of this article states that
"Normally you don't want to have access to the internals of too many other classes, and private inheritance gives you some of this extra power (and responsibility). But private inheritance isn't evil; it's just…
Belloc
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2 answers
Why does C++ allow this pointer polymorphism of private parent?
If I inherit a derived class privately from a base class, I cannot get the polymorphism of the inhritetted class.
But I can get the polymorphism of 'this' pointer inside the derived class.
I'm very curious about why 'this' pointer is allowed to…
sake
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Can I pull all members of a private base into the public scope of an inheriting class?
When inheriting privately from a base class, I can say public: using Base::member; to make that (non-private) member public within the inheriting class. Is there some way to expand this to get all the members at once? The context I want this in is a…
bitmask
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Bringing privately inherited Base`s class constructor to the Derived's public scope
Inheriting a constructor from a private template class in C++
explaining that by using Base::Base; inside Derived we're bringing the type Base injected in Base as Base::Base to scope of Derived and not actual Base's c-tor(s).
I'm intersting in whys…
Soup Endless
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C++ How can you Point to a Private Inherited Class Object Within a Class
I am learning about class inheritance and I wanted to know how one can create a pointer to a class that was inherited privately by another class? I've included a simple example below. Many thanks to those who help in answering this question.
class…
vectorjon
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upcasting to interface with private inheritance
I have the following situation
class Interface {
};
class ComplicatedObject : public Interface {
};
and I would like to give a simplified version of the ComplicatedObject, still providing the Interface. I was thinking to private inheritance, such…
Teloze
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1 answer
Overriding a publically aliased method via private inheritance
I have a class heirarchy where there is one base type Base with a list of implementations and another base class, AnotherBase, that is almost like Base but a little different. To express this in the language I used private inheritance on the second…
Curious
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Can I omit non-public inheritance for forward-declaration of classes?
Let's say I have a piece of code like this:
// Foo.h:
class Incomplete; // the forward-declaration
class Foo {
void bar(Incomplete&); // doesn't really matter
};
// Foo.cpp:
class Incomplete : private Baz {
};
void Foo::bar(Incomplete&) {
}
Is…
passing_through
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Private inheritance usage as described in "The C++ Programming Language"
In The C++ Programming Language, 4th Edition, at §20.5.2 "Access to Base Class" (page 605), it says (regarding private inheritance):
private bases are most useful when defining a class by restricting
the interface to a base so that stronger…
yonutix
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How to cast to privately derived child type?
The following is an attempt at implementing a shared pointer with a modified semantics of operator==:
template
struct deref_shared_ptr: private std::shared_ptr {
using Base = std::shared_ptr;
// ... using statements to…
AlwaysLearning
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How best to expose private inheritance to base class?
I am designing an object hierarchy in which the base class of all objects is Node, which is expected to be subclassed. Subclasses of Node will contain child items, but the type of child can vary from one subclass to another.
I am implementing…
Carlton
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