Defining classdef property validations for gpuArrays

Question

Jacob Lynch August 2018-11-6

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回答： Steven Lord 2018-11-6

Here are two scenarios I'm unsure how to handle when it comes to constructing class property validations with GPU types.

classdef NewObject 
    properties 
        Gobjs (:,1)          % this is any numeric type, on or off the gpu
        Types (:,1) int8     % this must be int8, on or off the gpuArray
        Index (:,1) gpuArray % But enforce that uint32 is the class underlying
        Grids (:,1) gpuArray % But enforce either double or single is the class underlying
    end
    % ... methods ...
end

What happens is that default values are instantiated but with incorrect types (e.g. usually a null gpuArray is of type double) and errors are thrown. I obviously could set default values with the correct types but then I need to manage within the functions the types, instead of letting the classdef manage the property types itself.

Is there a smarter way of letting MATLAB know the allowed types in these properties without defining a plethora of static methods to assert the conditions are met?

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Answer 1

Matt J 2018-11-6

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编辑：Matt J 2018-11-6

Couldn't you just use Property Set Methods to enforce types?

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Answer 2

Steven Lord 2018-11-6

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See the "Define Validation Functions" section on this documentation page for an example of how to create your own validator function. In this case, you'd probably want to write something like a mustHaveUnderlyingClass(a, allowedClasses) validator function that checks if the classUnderlying of the a input is a member of the allowedClasses list.