C++: Can a struct inherit from a class?

Question

I am looking at the implementation of an API that I am using.

I noticed that a struct is inheriting from a class and I paused to ponder on it...

First, I d

Answer 1

A class will not publicly inherit from a struct. A struct will publicly inherit from a class or a struct.

class A
{
public:
    int a;
};
struct B : A
{};

B b; b.a=5; //OK. a is accessible

class A
{
public:
    int a;
};
struct B : public A
{};

It means the same. B b; b.a=5; //OK. a is accessible

struct A
{int a;};
class B : A
{};

B b; b.a=5; //NOT OK. a is NOT accessible

struct A
{int a;};
class B : public A
{};

B b; b.a=5; //OK. a is accessible

Finally:

class A
{int a;};
class B : A
{};

B b; b.a=5; //NOT OK. a is NOT accessible

class A
{int a;};
class B : public A
{};

B b; b.a=5; //NOT OK. a is NOT accessible