//////////// CEditBox.hpp header file
#include <memory>
#include <string>
 
class CLabel;
 
 
class CEditBox
{
  public:
    CEditBox(std::string);
  private:
    std::unique_ptr<CLabel> _label;
};
 
//////////// CLabel.hpp header file
 
#include <string>
//#include "CLabel.hpp"
 
class CLabel
{
  public:
    CLabel(std::string name) : _name(std::move(name)) {}
  private:
    std::string _name;
};
 
///////////// CEditBox.cpp source file
 
//#include "CEditBox.hpp"
//#include "CLabel.hpp"
 
CEditBox::CEditBox(std::string name)
    : _label(new CLabel(std::move(name))) 
{
}
 
///////////// main.cpp source file
 
//#include "CEditBox.hpp"
 
int main()
{
    CEditBox box("Hello world"); // no need to 'know' CLabel here   
}
 

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