[MODs] How to mod? C++ Tutorial for newbies (Page 1 of 2)

Pointer:
datatype *Name = &Variable;
(& means the address of the variable)

*Name = value of the variable
Name = address of the variable

1. int *pScore = &m_Score;
set the value of m_Score with the Pointer:
*pScore = 1337;
get the address of m_Score:
pScore or &m_Score


2. We can reserve memory cells for special variables:
int *pVar = new int;
int pears = 5;
// pVar = &pears; Wrong, thx to BeaR
*pVar = pears; // is correct now...

after that we've to delete the reserved space:
delete pVar;

int CCollision::IntersectLine(vec2 Pos0, vec2 Pos1, vec2 *pOutCollision, vec2 *pOutBeforeCollision)
{
    float Distance = distance(Pos0, Pos1);
    int End(Distance+1);
    vec2 Last = Pos0;

    for(int i = 0; i < End; i++)
    {
        float a = i/Distance;
        vec2 Pos = mix(Pos0, Pos1, a);
        if(CheckPoint(Pos.x, Pos.y))
        {
            if(pOutCollision)
                *pOutCollision = Pos;
            if(pOutBeforeCollision)
                *pOutBeforeCollision = Last;
            return GetCollisionAt(Pos.x, Pos.y);
        }
        Last = Pos;
    }
    if(pOutCollision)
        *pOutCollision = Pos1;
    if(pOutBeforeCollision)
        *pOutBeforeCollision = Pos1;
    return 0;
}

vec2 collisionIn = vec2(0, 0); //The Collision inside the Wall;
vec2 collisionOut = vec2(0, 0); //The Collision outside the Wall;

// IntersectLine(vec2 Pos0, vec2 Pos1, vec2 *pOutCollision, vec2 *pOutBeforeCollision)
// Our function to check for Walls

IntersectLine(MyPosition, EnemysPosition, &collisionIn, &collisionOut);

// collisionIn has the first wallcollision inside the wall and
// collisionOut has the last position before collisionIn

...

public:
    IGameController(class CGameContext *pGameServer);
    virtual ~IGameController() {};

    // event
    /*
        Function: on_CCharacter_death
            Called when a CCharacter in the world dies.

        Arguments:
            victim - The CCharacter that died.
            killer - The player that killed it.
            weapon - What weapon that killed it. Can be -1 for undefined
                weapon when switching team or player suicides.
    */
    virtual int OnCharacterDeath(class CCharacter *pVictim, class CPlayer *pKiller, int Weapon);
    /*
        Function: on_CCharacter_spawn
            Called when a CCharacter spawns into the game world.

        Arguments:
            chr - The CCharacter that was spawned.
    */
    virtual void OnCharacterSpawn(class CCharacter *pChr);

    /*
        Function: on_entity
            Called when the map is loaded to process an entity
            in the map.

        Arguments:
            index - Entity index.
            pos - Where the entity is located in the world.

        Returns:
            bool?
    */
    virtual bool OnEntity(int Index, vec2 Pos);

...