Вспомнить наследование в c++ / Компиляция и запуск на маке: `clang -O3 -stdlib=libstdc++ inherit.cpp -o inherit&&./inherit`

inheritance-demo.cpp

// clang -O3 -stdlib=libstdc++ inherit.cpp -o inherit&&./inherit

#include <stdio.h>
#include <stdlib.h>

class iBem {
    protected: int setMod(){return 1;};
};

/*
 * `class Block: public iBem`: Public members of the base class become public members of the derived class and protected members of the base class become protected members of the derived class.
 * A base class's private members are never accessible directly from a derived class, but can be accessed through calls to the public and protected members of the base class.
*/
class Block: public iBem {
    public: int hide(){return this->setMod();}
};

class Block2: public iBem {
    // Use setMod via proxy
    public: int foo(){
        Block* anotherBlock = new Block();
        return anotherBlock->hide();
    }

    // Use setMod immediately
    public: int bar(){
        // Block* anotherBlock = new Block();
        // return anotherBlock->setMod(); // -- error
    }
};

class Block2Mod: public Block2 {
    // Use setMod immediately
    public: int baz(){
        return this->setMod();
    }
};

int main(void) {
    Block2* block = new Block2();
    Block2Mod* blockMod = new Block2Mod();

    printf("%d", block->foo());
    // printf("%d", block->bar());  // -- error
    printf("%d", blockMod->baz()); // -- ok
}