How does class members accessibility depend on their access specifiers and class inheritance type?

inheritance type
base class access specifier → derived class access specifier
[ accessible in derived class method? | accessible through derived class object? ]

public:
public       → public          [yes, yes]
protected → protected      [yes, no]
private     → private          [yes, no]

protected:
public      → protected      [yes, no]
protected → protected     [yes, no]
private     → private          [no, no]

private:
public       → private        [yes, no]
protected → private         [yes, no]
private     → private         [no, no]

Singly Linked List

C implementation C++ implementation