MATLAB Object-Oriented Programming

% Implement obj(indices) = varargin{:};

elseif length(s) == 2 && strcmp(s(2).type,'.')

% Implement obj(indices).PropertyName = varargin{:};

...

elseif length(s) == 3 && strcmp(s(2).type,'.') && strcmp(s(3).type,'()')

% Implement obj(indices).PropertyName(indices) = varargin{:};

...

else

% Use built-in for any other expression

obj = builtin('subsasgn',obj,s,varargin{:});

end

case '{}'

if length(s) == 1

% Implement obj{indices} = varargin{:}

...

elseif length(s) == 2 && strcmp(s(2).type,'.')

% Implement obj{indices}.PropertyName = varargin{:}

...

% Use built-in for any other expression

obj = builtin('subsasgn',obj,s,varargin{:});

end

otherwise

error('Not a valid indexing expression')

end

end

Using varargin for the right-side value of the assignment statement enables the method

to work with object arrays. For example, suppose that you want to support the assignment

of a comma-separated list with an expression like this one:

C = {'one';'two';'three'};

[objArray.PropertyName] = C{:}

This expression results in an indexing structure with the dot type ('.') indexing The cell

array C on the right side of the assignment statement produces a comma-separated list.

This code assigns one list item to each property in the object array.

case '.'

if length(s)==1

prop = s(1).subs; % Property name

n = numel(obj); % Number of elements in array

for k = 1:n

obj(k).(prop) = varargin{k};

end

end

end

17 Specialize Object Behavior