instance of class

[revit]

i want to creat a static instance of class- meaning an object that can be shared by all the other classes, i made
a new field in my class t:
static t* MyInstance;

and a function:
static t* instance()
{
if(MyInstance==NULL)
{
MyInstance=new t();
}
return MyInstance;
}


from the cpp file i created a new instance of the class t:
t::MyInstance=NULL;

but something is wrong because i recieved this error: nresolved external symbol "public: st....

please help!

 

[Zyrenthian]

Sounds like you would benefit from the "Singlton" design pattern.

For that... the constructor is protected or private. I also think that MyInstance should be declared in the cpp as

t* t::MyInstance = NULL;

and instance should look like

t* t::instance()
for the function declaration unless that is from the header file and you inlined the function. In the cpp you do not need to declare them as static functions

Matt