Why does inputParser allow a required argument to also be input as a name-value pair?

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DEK800W6
DEK800W6 2016-1-27
编辑： jgg 2016-1-29
In R2013b, with a mix of addRequired and addParameter definitions, if the user happens to supply a name-value pair using the same name as the required argument, the value from the name-value pair takes precedence. Example code:
function [] = parsertest( req, varargin )
p = inputParser;
p.addRequired( 'req' );
p.addParameter( 'opt1', 1 );
p.parse( req, varargin{:} );
p.Results
end
>> parsertest( 'a', 'req', 'x')
ans =
opt1: 1
req: 'x'
Since 'req' was not specified with addParameter, I would expect this to throw an error rather than req taking on the value 'x'.
Another situation I would think would cause an error is if multiple instances of 'req', are supplied. Instead, the last instance wins:
>> parsertest( 'a', 'req', 'x', 'req', 'y', 'req', 'z')
ans =
opt1: 1
req: 'z'
Are these behaviors expected?
  1 个评论
jgg
jgg 2016-1-27
编辑：jgg 2016-1-29
Wow, this is not at all how I expected this would work. It seems that the addParameter name-pair is somehow taking precedence over the required name-pair, despite the name for the required parameter being entirely internal to the input parser object. This definitely looks like a bug to me, especially since I cannot find any option or setting to control this behaviour. Bumping for priority.
EDIT1: I replicated in this R2015A as well, so it's not version specific. I think it's also a security concern, since if you have validation on addRequired but not on addParameter, you could inject values into the "required" value while skipping validation.

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