(C++) access level

A class has three access levels:

• private
• protected
• public

A class' default access level is private. A struct's default access level is public.

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struct MyClass {   //public by default, so the keyword public below is redundant   public   : int m_public;   protected: int m_protected;   private: : int m_private; }; int main() {   MyClass m;   m.m_public    = 0; //OK, this member variable is public   m.m_protected = 0; //Not allowed, this member variable is protected   m.m_private   = 0; //Not allowed, this member variable is private }