class <name>;

[Christopher]

I came across this line in a lib I am studing, it simply has
class cSceneNode;
all by itself. what is that line doing? I am used to seeing a
declaration: MyClass test;
or definition: class MyClass{ public: foo();};
but never just: class <name>;

Thanx,
Christopher

 

[=?ISO-8859-1?Q?Le_G=E9ant_Vert?=]

I came across this line in a lib I am studing, it simply has
class cSceneNode;
all by itself. what is that line doing? I am used to seeing a
declaration: MyClass test;
or definition: class MyClass{ public: foo();};
but never just: class <name>;

Thanx,
Christopher

this is a forward declaration ; this is used for example when A uses a B
and B uses an A ...
this just means that the implementation of this class is somewhere else,
but you can use it.

 

[Default User]

I came across this line in a lib I am studing, it simply has
class cSceneNode;
all by itself. what is that line doing? I am used to seeing a
declaration: MyClass test;
or definition: class MyClass{ public: foo();};
but never just: class <name>;

Just the FAQs, Jack.


http://www.parashift.com/c++-faq-lite/misc-technical-issues.html#faq-38.11




Brian Rodenborn

 

[Rolf Magnus]

I came across this line in a lib I am studing, it simply has
class cSceneNode;
all by itself. what is that line doing?

It (forward-)declares a class.

I am used to seeing a
declaration: MyClass test;

That's a definition. It defines an object of class MyClass.

or definition: class MyClass{ public: foo();};

That defines a class.

but never just: class <name>;

That declares a class.