c++ inheritence help

[Choad]

ok heres my object code


// Class Functions
//////////////////

CObject::CObject()
{
Init();
}

CObject::~CObject()
{
DeInit();
}

void CObject::Init()
{
// add this instance to the global linked list of objects
myNode = new node;
myNode->obj = this;
myNode->next = NULL;
myNode->prev = NULL;

if (lastObject == NULL)
{
firstObject = myNode;
lastObject = myNode;
} else
{
lastObject->next = myNode;
myNode->prev = lastObject;
lastObject = myNode;
}

// set other variables
ID = IDC;
IDC++;
x = 0;
y = 0;
sprite = NULL;
}

void CObject::DeInit()
{
if (myNode == firstObject)
{
firstObject = myNode->next;
}
if (myNode == lastObject)
{
lastObject = myNode->prev;
}
if (myNode->next != NULL)
{
myNode->next->prev = myNode->prev;
}
if (myNode->prev != NULL)
{
myNode->prev->next = myNode->next;
}
if (sprite != NULL)
{
SDL_FreeSurface(sprite);
}
}

int CObject::GetID()
{
return ID;
}

void CObject::Draw()
{
if (sprite != NULL)
{
// draw my sprite
rectTemp.x = x;
rectTemp.y = y;
SDL_BlitSurface(sprite,
NULL,
screen,
&rectTemp);
}
}

void CObject::Step()
{
}

void CObject::KeyDown()
{
}


void CObject::KeyUp()
{
}

CBlock::CBlock()
{
Init();
}

CBlock::~CBlock()
{
DeInit();
}

and heres the error i get when compiling

richard@richard-laptop:~/Desktop$ g++ `sdl-config --cflags --libs` -o mygame newproj.cpp -lSDL -lSDL_image
newproj.cpp:186: error: definition of implicitly-declared ‘CBlock::CBlock()’
newproj.cpp:190: error: definition of implicitly-declared ‘CBlock::~CBlock()’
richard@richard-laptop:~/Desktop$


this is to do with my newly added class CBlock... i am just learning so i dont know what i did wrong. thx in advance for any help!

[EntropicTundra]

You need to add prototypes for CBlock::CBlock and CBlock::~CBlock in the declaration for CBlock. Example:

class CBlock
{
public:
CBlock();
~Cblock();

// etc
}

The compiler doesn't complain about the same issue in CObject, so you must have done it right there. Take a look at the CObject declaration.

[Choad]

ahh legend!