mthread and multiple header files

Question

I'm using mthreads (https://github.com/jlamothe/mthread) for my arduino. But now as the project is getting bigger, it would make sense to break it up in several files.

I successfully outsourced already a part which is not threaded. But somehow I cannot make up my mind how to use mthread in conjunction with several header files.

here is what I got:

main: call header:

#include "tcan.h"

tcan.h:

#ifndef tcan_h
#define tcan_h

#include "Arduino.h"

class tcan : public Thread {
  public: tcan();
  protected: bool loop();
  private:
};
#endif

tcan.cpp

#include "Arduino.h"
#include "tcan.h"
#include <mcp_can.h>

bool tcan::loop() {
  // lala
  return true;
}

but I get an error when compiling:

tcan.h:6:28: error: expected class-name before '{' token class tcan : public Thread {

Thanks in advance

Check for circular #includes... The error can be caused by including Arduino.h twice. — user3704293
– user3704293, Commented Jan 27, 2016 at 7:46

Mikael Patel · Accepted Answer · 2016-01-27 09:15:30Z

1

The compiler error is due to that the compiler does not know what Thread is.

tcan.h:6:28: error: expected class-name before '{' token class tcan : public Thread {

The issue is that the header file is not complete. A good practice is to include all header files that are needed to read the header file. As Thread is defined in mthread.h the tcan.h file should be:

#ifndef tcan_h
#define tcan_h

#include <mthread.h>

class tcan : public Thread {
public: tcan();
protected: bool loop();
private:
};
#endif

Cheers!

edited Jan 27, 2016 at 9:15

answered Jan 27, 2016 at 8:48

Mikael Patel

7,9892 gold badges16 silver badges21 bronze badges

that was the right hint "Assuming that Thread is defined in mcp_can.h". Of course I need to include "<mthread.h>". Thanks for the hint! It's working now.

jblaze
– jblaze

2016-01-27 08:53:22 +00:00
Commented Jan 27, 2016 at 8:53
Great! I will update the answer with the correct include.

Mikael Patel
– Mikael Patel

2016-01-27 09:14:39 +00:00
Commented Jan 27, 2016 at 9:14

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