Databases
StackOverflow2013
Postsdbo
POC++ : Multiple inheritance with polymorphism
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POC++ : Multiple inheritance with polymorphism
    primarykey
    data
    text
    <p>(pardon the noob question in advance)</p> <p>I have 4 classes:</p> <pre><code>class Person {}; class Student : public Person {}; class Employee : public Person {}; class StudentEmployee : public Student, public Employee {}; </code></pre> <p>Essentially <code>Person</code> is the base class, which are directly subclassed by both <code>Student</code> and <code>Employee</code>. <code>StudentEmployee</code> employs multiple inheritance to subclass both <code>Student</code> and <code>Employee</code>.</p> <pre><code>Person pat = Person("Pat"); Student sam = Student("Sam"); Employee em = Employee("Emily"); StudentEmployee sen = StudentEmployee("Sienna"); Person ppl[3] = {pat, sam, em}; //compile time error: ambiguous base class //Person ppl[4] = {pat, sam, em, sen}; </code></pre> <p>When I use an array of <code>Person</code>, the base class, I can put <code>Person</code> and all of its subclasses inside this array. Except for <code>StudentEmployee</code>, given the reason ambiguous base class.</p> <p>Given that <code>StudentEmployee</code> is guaranteed to have all the methods and attributes of <code>Person</code>, is <code>StudentEmployee</code> considered a subclass of Person? </p> <ul> <li>If so, Why does the compiler not allow me to assign an object to a variable of the type of its superclass?</li> <li>If not, why not; and what would be the proper way to accomplish this?</li> </ul> <p>Cheers</p> <hr> <p>EDIT: Preemptively, this question is NOT the same as either of the following:<br> <a href="https://stackoverflow.com/questions/2423231/polymorphism-relates-inheritance">polymorphism relates inheritance</a><br> <a href="https://stackoverflow.com/questions/1889996/inheritance-mucking-up-polymorphism-in-c">Inheritance mucking up polymorphism in C++?</a> </p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USbguiz
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    3. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POC++ : Multiple inheritance with polymorphism
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POC++ : Multiple inheritance with polymorphism
      1. USjdehaan
      1. VTFavorite
    3. VO
      singulars
      1. POC++ : Multiple inheritance with polymorphism
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload