Listing One

// Forward
class Company;
class BoardOfDirectors;
class CompanyBoardProperties;

class Company
{
  public:
    Company() : CompanyBoardAssn ( *this )
    {
    }
    string name;
    ASToOneProp< Company, BoardOfDirectors, CompanyBoardProperties > 
      CompanyBoardAssn;
};
class BoardOfDirectors
{
  public:
    BoardOfDirectors() : CompanyBoardAssn ( *this )
    {}
    ASToOneProp<BoardOfDirectors, Company, CompanyBoardProperties> 
      CompanyBoardAssn;
};
class CompanyBoardProperties
{
  public:
  ...