question about Library "#include" lines

Projects Programming
1

I wrote a small library, that essentially is a sub-class of another working library.

My library header has the following:

#include <Arduino.h>
#include <MainClass.h>

My library ccp file has:

#include "MyLib.h"

My sketch has:

#include "MyLib.h"

It does not verify, it says:

MyLib.h:12: error: expected class-name before '{' token

and some other erros related to variables that don't name a type

If I add this line

#include <MainClass.h>

to my sketch, it verifies/uploads/works just fine. Why?
I must specify that the sketch doesn't contain any direct reference to the MainClass, it only uses an istance of MyLib class.
Thank you

2

Why?

There are a number of other threads that deal with why. The IDE copies files to another directory for compiling. What it copies is the sketch and any files related to #include statements in the sketch, but NOT in files included in the sketch.

3

if so, is there any workaround to avoid including the main class in the sketch but only include the subclass?

4

if so, is there any workaround to avoid including the main class in the sketch but only include the subclass?

No, and, even if there were, I wouldn't recommend it. Trying to hide the use of a library is not a good idea.

5

but removing that line I don't mean to hide the use of the library. The sketch uses the subclass, and that one is seen as library, so it's not a matter of the writer of the sketch to include its superclass if he already included the subclass. Usually it should work like this, or not?

6

I haven't tried it, but it might be possible to trick the IDE into thinking that the #included file is part of the project, while excluding it from compilation of the .ino file, by enclosing the #include line in #ifdef UNDEF / #endif lines.

7

Dimitree:
but removing that line I don't mean to hide the use of the library. The sketch uses the subclass, and that one is seen as library, so it's not a matter of the writer of the sketch to include its superclass if he already included the subclass. Usually it should work like this, or not?

Is this subclass in a different directory to the main class?