Example

class Base {
public:
void fnc(){}
};

class Derived: public Base {
public:
void fnc(){}
};

void function(Derived *dp){

Base *ptr = (Base *) dp;
ptr->fnc();

}

Solution

Do not cast a pointer of one class to the a pointer of a class inherited from.

class Base {
public:
virtual void fnc(){}
};

class Derived: public Base {
public:
virtual void fnc(){}
};

void function(Derived *dp){

dp->fnc();

}