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Questions tagged [friend]

In object-oriented programming, friend refers to a method or class that has access to some non-public aspects of a particular class.

In object-oriented programming, friend refers to a method or class that has access to some non-public aspects of a particular class.

Different programming languages use the friend keyword differently. Make sure it is clear which language you are asking about.

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Restricted class factory design pattern

Is there an elegant (or any) way to achieve following in C#? Let's have a class ItemBase (further derivable to Item1, Item2...), which does not allow direct instantiation (non-public construction) - to prevent user to create any 'untracked'…
sharpener
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Use of `friend` in self contained program?

I have a large, self-contained environmental model. In the model I have a large class called cell, that contains many (~100) vectors and doubles that all together dictate the current state of the cell across many attributes. These attributes are…
traggatmot
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Use of friend as "namespace-private" fields or methods

I have a question which is basically the quite opposite of this one. As we can see in this post, Java does have one more access mode than C++ : package one. In my code, I would like to make a class that only some other class could instantiate and…
Aracthor
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Friend function is not accessing private members of another friend class

I have two classes Term and Polynomial. Polynomial class is declared to be a friend of Term class. Polynomial class has friend function in it. When i implement that function in a cpp file of Polynomial class, the private members of Term are not…
R32
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Friend Function can't see private member

I've tried to figure this out for an hour now and I've gotten nowhere. I have a class with a friend function and private members but I am getting a compiler error telling me that I cannot access a private member using that friend function. line 36…
Timothy Kelly
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Linking "Friends" with the account holders profile

I am designing an application where an account holder has "friends". How would I go about linking those friends to the original account holder? Would an efficient SQL table be something like: AccountHolderID (varChar 20) FriendsID (nText)
user279521
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argument list for class template Vec2 is missing

I am defining a Vec2 class with a friend functions. I am getting the error: argument list for class template Vec2 is missing for the friend function: friend Vec2 operator * (const T &r, const Vec2 &v). template class Vec2 …
Francisco Porrata
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How to overload an operator with a friend function in a generic class?

I have written a matrix class. I have overloaded the operator+, so that the user can write: matrix + 2. I would like the user to also write: 2 + matrix. For the standard format (i.e. the object invoking 2) I have written a standard operator…
Ryan J. Shrott
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Dependency in template friend of template class

After hours of trying to find out this syntax by reading the standart I gave up on trying to understand this. I have a template class with a template constructor I need to partially specialize, since this is impossible I wrapped the constructor…
Omer Rosler
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Creating and using func pointer to method of friend class

I have 2 classes: enum class Enumtype { typ1, typ2, }; class A { private: retType Func1(arg1Type, arg2Type, arg3Type); retType Func2(arg1Type, arg2Type, arg3Type); public: A(); retType Func(Enumtype, arg1Type, arg2Type,…
MKK
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Operation with 2 friends constructor

I created two classes and a constructor in each. Type followed a new class and constructors friends functions of the classes before. #include using namespace std; class clsAtmosfericConditions; class clsDensity{ float…
Oscar Espinosa
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Numeric Array Class: Multiplication using friend functions

I have been trying to solve this bug for days. I made a generic array class, from which I used generic inheritance to create a numeric array. Everything works perfect; however, I am having trouble with multiplication/scaling of the numeric array. I…
Ryan J. Shrott
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Lambda expressions (C++0x) not working in C++/CLI?

If I write this std::function myFunction = []() {return 42;}; in C++/CLI under VS2010 (in an MSTest unit test class, in case it matters), I get the compiler error C3809: a managed type cannot have any friend functions/classes/interfaces. Is…
Robin
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Calling Protected Function From Derived Friend Function

I have a base class, Animal, and a derived class, Lion. Animal has a protected function called eat(). I would like to call eat() from a friend function defined in Lion, but when it won't compile: error: call to non-static member function without an…
AndrewCox
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cannot access private members in friend ostream

I tried to make friend ostream function. The compiler say i cannot access private member of the class, even though i declared it as friend. I read a similar question and it say the problem is with the namespcaes.(the question: C++ friend function…
asdas asda
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