Menu
I just stumbled a c++ code with a calling of a class name in the upper part of the header file for example
class CFoo;
class CBar
{
....
};
My question is, what is class CFoo for?
Thanks alot!
661
Traditionally, the class definition is put in a header file of the same name as the class, and the member functions defined outside of the class are put in a . cpp file of the same name as the class. Now any other header or code file that wants to use the Date class can simply #include "Date. h" .
A class is defined in C++ using keyword class followed by the name of class. The body of class is defined inside the curly brackets and terminated by a semicolon at the end.
You request to use a header file in your program by including it with the C preprocessing directive “#include”. All the header file have a '. h' an extension. By including a header file, we can use its contents in our program.
C++ classes (and often function prototypes) are normally split up into two files. The header file has the extension of . h and contains class definitions and functions.
This is called a forward declaration. It means that there IS a class named CFoo, that will be defined later in the file (or another include). This is typically used for pointer members in classes, such as:
class CFoo;
class CBar {
public:
CFoo* object;
};
It is a hint to the C++ compiler telling it not to freak out that a type name is being used without being defined, even though it hasn't seen the full definition for CFoo yet.
58
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
