A C++ example I made to demonstrate polymorphism to David Rogers

polymorphism-example.cpp

// Base Class
class BaseClass
{
public:
    virtual void myFunc()
    {
        cout << "myFunc From BaseClass";
    }

    void overLoaded()
    {
        cout << "overLoaded from BaseClass";
    }
};

// derived Class
class TacosClass : public BaseClass
{
    int tacosInt;
public:
    virtual void myFunc()
    {
        cout << "myFunc from TacosClass";
    }

    void overLoaded()
    {
        cout << "overLoaded from TacosClass";
    }
};

void main()
{
    BaseClass* tamborines = new TacosClass();
    BaseClass* baseClass = new TacosClass();
    TacosClass* tacosClass = baseClass;   

    tamborines.myFunc(); // output: myFunc from TacosClass

    baseClass.overLoaded(); // output: overLoaded from BaseClass
    tacosClass.overLoader();// output: overLoaded from TacosClass

    cout << tamborines.tacosInt; // This is an error becuase BaseClass didn't declare a tacosInt

    delete tamborines;
    return 0;
}

void BaseClass :: funcCall()
{
    myFunc();
}

// Need to add This Header to the hl2_player.cpp file
#include "hl2mp_player.h"

void CHL2_Player::StartSprinting( void )
{
    CHL2MP_Player* testingForMP = dynamic_cast<CHL2MP_Player*>(this); // This line casts the this pointed up to a CHL2MP_Player*

    if(testingForMP == 0) // this is not a CHL2MP_Player
    {

        if( m_HL2Local.m_flSuitPower < 10 )
        {
        // Don't sprint unless there's a reasonable
        // amount of suit power.
        CPASAttenuationFilter filter( this );
        filter.UsePredictionRules();
        EmitSound( filter, entindex(), "HL2Player.SprintNoPower" );
        return;
        }

        if( !SuitPower_AddDevice( SuitDeviceSprint ) )
            return;

        CPASAttenuationFilter filter( this );
        filter.UsePredictionRules();
        EmitSound( filter, entindex(), "HL2Player.SprintStart" );

        SetMaxSpeed( HL2_SPRINT_SPEED );
        m_fIsSprinting = true;
    }
    else // this is a CHL2MP_Player
    {
        testingForMP->StartSprinting();
    }
}