class Capp{
public:
Capp(){};
~Capp(){};
class init{
public:
init(){};
~init(){};
int video();
int opengl();
int input();
int audio();
int console();
int all();
private:
};
private:
};
Capp app;
app.init.all(); // this doesn't work... why???
stupid c++ question, but answear needed
Author
I want to make a submember(?) in a class, i tried this, but it doesnt work
any idea how to do it???
do I have to use derived classes??
how??
thx
[edited by - kiehl on May 3, 2003 4:33:10 PM]
You can''t declare a class inside another class.
Do it like this:
class CInit
{
public:
void all();
};
class CApp
{
public:
CInit init;
};
now you can do this
Capp app;
app.init.all();
My Site
Do it like this:
class CInit
{
public:
void all();
};
class CApp
{
public:
CInit init;
};
now you can do this
Capp app;
app.init.all();
My Site
quasar3d: Yes, you can declare a class inside a class. See my code sample below; by placing the
kiehl:
You need to make an object/instance of type
Now you can do:
[ Google || Start Here || ACCU || MSDN || STL || GameCoding || BarrysWorld || E-Mail Me ]
CInit declaration inside the Capp class, you give it it class scope. So, for example, you can''t use it outside of Capp.kiehl:
You need to make an object/instance of type
init. Remember, class declarations/definitions merely describe how memory is to allocated, etc. They don''t actually create an object. I think this is what you want to be doing:
class Capp
{
private:
class CInit
{
public:
init(){};
~init(){};
int video();
int opengl();
int input();
int audio();
int console();
int all();
private:
};
public:
Capp(){};
~Capp(){};
CInit init;
private:
};
Now you can do:
Capp app;
// ...
app.init.all(); [ Google || Start Here || ACCU || MSDN || STL || GameCoding || BarrysWorld || E-Mail Me ]
i think you can declare a class within a class. your problem is that you're using "app.init.all();" incorrectly. You need CApp to have an instance of init to use it. So you'd have a member in CApp called init m_Init; and then you can use that instance to access the members of your init class.
correct me if i'm wrong.
EDIT: beaten... too slow haha
[edited by - knyot on May 3, 2003 4:54:06 PM]
correct me if i'm wrong.
EDIT: beaten... too slow haha
[edited by - knyot on May 3, 2003 4:54:06 PM]
quote:Original post by quasar3d
I never knew this. Are there some rules for when to use this?
The classic use is a class that the enclosing class uses as a private member. like so:
class List{public: // ...private: class Node { // ... } *head, *tail;}; Another use: look how you declare STL iterators. They are classes defined within the container class:
class List{public: class Iterator { // ... };}; How appropriate. You fight like a cow.
Wait, please forgive me if this was already said but what is the use for sub-classes?
There''s no town drunk here, we all take turns.
There''s no town drunk here, we all take turns.
quote:Original post by Ekim_Gram
Wait, please forgive me if this was already said but what is the use for sub-classes?
Read my last post.
How appropriate. You fight like a cow.
This topic is closed to new replies.
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