VEX struct constructor

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Joined: Feb. 2016
What does the empty constructor do for a struct? I've seen this in the “pbr.h” file for instance:

pbr_varianceaa variance_start()
return pbr_varianceaa();

where pbr_varianceaa is a struct.

or in the “bsdf.h” file there is this line:

bsdf f = bsdf();

Thanks a bunch!
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