Passing a single class instance to another class

Projects Programming
8

@PieterP : Thanks for your help. I made the changes you requested and it still resulted in errors (at bottom). I will also include all other relevant info (which is probably repeated in first post) to make sure we are in the same page :

Box.h

class Box {
  private:
    Debug &_debug;
  public:
    Box(Debug &debug);
};

Box.cpp

Box::Box(Debug &debug) :
 _debug(debug) {
  pinMode(28, INPUT_PULLUP);
}

Puzzle.h

#include "Debug.h"
#include "Box.h"

class Puzzle {  
  private:
    Debug _debug;
    Box _box;
  public:
    void setup();
    void loop();
};

Puzzle.cpp


void Puzzle::setup(){
  _debug = Debug();
  _box = Box(_debug);
  
  _debug.line("Puzzle Setup");
}

void Puzzle::loop(){
}

Errors

sketch\Puzzle.cpp: In member function 'void Puzzle::setup()':
Puzzle.cpp:6:20: error: use of deleted function 'Box& Box::operator=(Box&&)'
   _box = Box(_debug);
                    ^
In file included from sketch\Puzzle.h:5:0,
                 from sketch\Puzzle.cpp:1:
sketch\Box.h:6:7: note: 'Box& Box::operator=(Box&&)' is implicitly deleted because the default definition would be ill-formed:
 class Box {
       ^~~
Box.h:6:7: error: non-static reference member 'Debug& Box::_debug', can't use default assignment operator
Main:3:8: error: use of deleted function 'Puzzle::Puzzle()'
 Puzzle puzzle;
        ^~~~~~
In file included from D:\project\escape\puzzle box\source\Main\Main.ino:1:0:
sketch\Puzzle.h:7:7: note: 'Puzzle::Puzzle()' is implicitly deleted because the default definition would be ill-formed:
 class Puzzle {
       ^~~~~~
Puzzle.h:7:7: error: no matching function for call to 'Box::Box()'
In file included from sketch\Puzzle.h:5:0,
                 from D:\project\escape\puzzle box\source\Main\Main.ino:1:
sketch\Box.h:10:5: note: candidate: Box::Box(Debug&)
     Box(Debug &debug);
     ^~~
sketch\Box.h:10:5: note:   candidate expects 1 argument, 0 provided
sketch\Box.h:6:7: note: candidate: constexpr Box::Box(const Box&)
 class Box {
       ^~~
sketch\Box.h:6:7: note:   candidate expects 1 argument, 0 provided
sketch\Box.h:6:7: note: candidate: constexpr Box::Box(Box&&)
sketch\Box.h:6:7: note:   candidate expects 1 argument, 0 provided
exit status 1
use of deleted function 'Box& Box::operator=(Box&&)'

I'm guessing this is because _debug and _box need to be defined. I tried to do this prior using the member initialization list and could not get it to work.

Thanks for everyones help