Question about classes in C++

[Lucifre]

My book states that class methods must always be defined in a source file.
is it possible to define a class and its method definitions in a single header file?
If i am not wrong string is a class, and u use only a single header file to use it.

 

[lambtron]

My book states that class methods must always be defined in a source file.
is it possible to define a class and its method definitions in a single header file?
If i am not wrong string is a class, and u use only a single header file to use it.

Yes! This is permissible as long as you only include the header file once in your project. If you include it more than once you will get Duplicate Definition errors.