c++ - Is a local class in a method of a class a friend of this class? -

i have outer class a. has method a::fun. in method, has local or inner class b. question is: b friend of a?

i think not. right? if so, think let class b friend of a beneficial since b can access a's private , protected members. , moreover, sinceb local in methods, not accessible others , safe friend of a. how work around let b access a's private , protected members?

no not friends.

but local classes have same access names outside function function itself.

the standard says :

9.8 local class declarations [class.local]

a class can declared within function definition; such class called local class. name of local class local enclosing scope. the local class in scope of enclosing scope, , has same access names outside function enclosing function. declarations in local class shall not odr-use (3.2) variable automatic storage duration enclosing scope.

the big difference take in count local class accessible inside function.

but after :

• a friend of class function or class given permission use private , protected member names class.
• the local class in scope of enclosing scope, , has same access names outside function enclosing function. is, can access protected , private members of class function belongs.