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benlue
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Joined: 09 Oct 2006
Posts: 2142
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 Posted: Sat Mar 24, 2007 6:30 am Post subject: Template Managers |
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This is a little tutorial on template managers .
What are managers ?
They are used to manage data and save much time so one code doesn't need to be re-written .
Simple Template Manager
The Interface:
| Code: | template <class T, int n> class TManager
{
public:
TManager(void);
~TManager(void);
int Add(const T* p_T);
int Delete(const T* p_T);
int Delete(int index);
int DeleteAll();
T* Get(int index);
T* Get(const T* p_T);
Int GetCount();
int GetError();
char *GetErrorString();
protected:
int error;
T* p_T[n];
};
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Most functions perform rather obvious operations, although the last three functions might seem strange . These functions really aren't required but I used them anyway . The GetCount() function returns the maximum number of objects that can be managed by this class . The GetError() function returns an error code if one of the previously called functions failed . Normally I just give functions two types of return values - one indicates success and one indicates failure . On failure I then call the GetError() function to retrieve the error .
Singleton
This is the more complex .
| Code: | template <class T, int n> class TPersistentManager
{
public:
TPersistentManager(void);
~TPersistentManager(void);
int Add(const T* p_T);
int Delete(const T* p_T);
int Delete(int index);
int DeleteAll();
T* Get(int index);
T* Get(const T* p_T);
Int GetCount();
int GetError();
char *GetErrorString();
private:
static int refcount;
static TManager<T, n> *p_m_tManager;
};
// Note that you MUST initialize these for correct functionality
template <class T, int n> int TPersistentManager<T, n>::refcount = 0;
template <class T, int n> TManager<T, n>* TPersistentManager<T, n>::p_m_tManager = 0x00000000;
template <class T, int n>
TPersistentManager<T, n>::TPersistentManager(void)
{
if(refcount == 0)
{
p_m_tManager = new TManager<T, n>;
}
refcount++;
}
template <class T, int n>
TPersistentManager<T, n>::~TPersistentManager(void)
{
refcount--;
if(refcount == 0)
{
delete p_m_tManager;
p_m_tManager = 0x00000000;
}
}
template <class T, int n>
int TPersistentManager<T, n>::Add(const T* p_T)
{
return p_m_tManager->Add(p_T);
}
// .
// . Rest of code omitted… see the attached code files
// .
template <class T, int n>
char *TPersistentManager<T, n>::GetErrorString()
{
return p_m_tManager->GetErrorString();
}
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This makes sure that there is only one TManager pointer in the TPersistentManager template . It also redirects all functions to use that TManager class for performing its actions .
Using It
This is how to use it . ( Please figure this out or it will be spoonfeeding  )
| Code: | class CImageSystem : public TPersistentManager<CImage, 128>
{
public:
CImageSystem();
~CImageSystem();
. // Functions you want to make specific for the CImageSystem class
.
.
}
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My Words
I do not expect perfection so this isn't great as you may know of me , if you don't get it , read it again or just ditch it like all the failures out there .
That's all .
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DeltaFlyer
Grandmaster Cheater
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Joined: 22 Jul 2006
Posts: 666
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| Posted: Sat Mar 24, 2007 10:33 am Post subject: |
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I don't see a use for this.
_________________
Wow.... still working at 827... what's INCA thinking?
zomg l33t hax at this place (IE only). Over 150 people have used it, what are YOU waiting for? |
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benlue
Moderator
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Joined: 09 Oct 2006
Posts: 2142
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| Posted: Sat Mar 24, 2007 6:53 pm Post subject: |
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Well , many people attempt to make a maplestory private server . I'm just saving them time . OR this could be used in other ways . 
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