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Groups > comp.lang.c++ > #86066

New feature in C++ wanted: friend limited to one function only in a class

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I had this situation many times, that I wanted to use friend in class 
but I dont want friend be able to get
access to ALL members, only maybe one function. I wish there was a 
feature in C++ like this:

class Parent
{
private:	
	void foo() { : friend Child // new feature
	}
	
	void foo2() {
	}
};

and now Child can get access to foo() and ONLY it:

class Child
{
public:	
	Parent* m_parent{nullptr}; // later initialized ...
	void foo3() {
		// Can access only foo()
		m_parent->foo(); // this is OK
		// cannot access any other privates
		m_parent->foo2(); // this is NOT OK
	}
};

Can anybody suggest this to Bjarne? hehe

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Thread

New feature in C++ wanted: friend limited to one function only in a class JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-08-25 20:11 +0300
  Re: New feature in C++ wanted: friend limited to one function only in a class "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2022-08-25 20:13 +0200
    Re: New feature in C++ wanted: friend limited to one function only in a class JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-08-25 23:13 +0300
  Re: New feature in C++ wanted: friend limited to one function only in a class JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-08-25 23:11 +0300
  Re: New feature in C++ wanted: friend limited to one function only in a class Manfred <noname@add.invalid> - 2022-08-26 01:59 +0200
    Re: New feature in C++ wanted: friend limited to one function only in a class JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-08-26 07:19 +0300
    Re: New feature in C++ wanted: friend limited to one function only in a class JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-08-26 07:25 +0300
  Re: New feature in C++ wanted: friend limited to one function only in a class Paavo Helde <eesnimi@osa.pri.ee> - 2022-08-26 12:13 +0300
    Re: New feature in C++ wanted: friend limited to one function only in a class JiiPee <kerrttuPoistaTama11@gmail.com> - 2022-08-26 19:29 +0300
      Re: New feature in C++ wanted: friend limited to one function only in a class Paavo Helde <eesnimi@osa.pri.ee> - 2022-08-26 20:49 +0300
  Re: New feature in C++ wanted: friend limited to one function only in a class Michael S <already5chosen@yahoo.com> - 2022-08-26 03:55 -0700

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