Can I use a void ** pointer to pass a generic pointer to a function by reference?
Not portably. There is no generic pointer-to-pointer type in C. void * acts as a generic pointer only because conversions are applied automatically when other pointer types are assigned to and from void *'s; these conversions cannot be performed (the correct underlying pointer type is not known) if an attempt is made to indirect upon a void ** value which points at something other than a void *.
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This page by Steve Summit // Copyright 1995 // mail feedback