MATLAB Object-Oriented Programming

function obj = MyClass(a,b,c)

if nargin > 0

obj.A = a;

obj.B = b;

obj.C = c;

...

end

end

For ways to handle superclass constructors, see “Basic Structure of Constructor

Methods” on page 9-21.

Subclass Constructors

Subclass constructors can call superclass constructors explicitly to pass arguments to the

superclass constructor. The subclass constructor must specify these arguments in the call

to the superclass constructor and must use the constructor output argument to form the

call. Here is the syntax:

classdef MyClass < SuperClass

methods

function obj = MyClass(a,b,c,d)

obj@SuperClass(a,b);

...

end

end

end

The subclass constructor must make all calls to superclass constructors before any other

references to the object (obj). This restriction includes assigning property values or

calling ordinary class methods. Also, a subclass constructor can call a superclass

constructor only once.

Reference Only Specified Superclasses

If the classdef does not specify the class as a superclass, the constructor cannot call a

superclass constructor with this syntax. That is, subclass constructor can call only direct

superclass constructors listed in the classdef line.

classdef MyClass < SuperClass1 & SuperClass2

MATLAB calls any uncalled constructors in the left-to-right order in which they are

specified in the classdef line. MATLAB passes no arguments with these calls.

9 Methods — Defining Class Operations