Make accessing single elements in empty parameter vectors return an empty optional #693
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Otherwise we run into a read out of bounds in case the parameter is stored, but with an empty vector value. E.g. from setting it with a vector that comes from an external source which is empty.
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BEGINRELEASENOTES
GenericParameterswhere trying to access a single element of a parameter that was stored as an empty vector resulted in a crash. Instead make this return an empty optional now.ENDRELEASENOTES
@dirkzerwas this is the fix for the issue in our email discussion.
This seems to be the most reasonable thing to do. The other option would be to return an empty / default constructed value in this case. However, since we introduced the
std::optionalreturn type for avoiding exactly that (see #580), I don't think that makes a lot of sense and would make the API inconsistent again.