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Top Forums Programming Parameter passing to function with void * as Argument Post 302903258 by alister on Monday 26th of May 2014 12:22:49 PM
Old 05-26-2014
Quote:
Originally Posted by Corona688
Bad advice! Very dangerous! Unions do not work that way!

If you don't add the 'type' value to the structures, then it won't work properly in the union! It will refer to some other member.
I'm assuming that you misunderstood what I meant by 'tagged union'. It's the final data structure in my previous post, following the text which you quoted. In C, a tagged union is not a union; it is a struct containing a tag (or type) and a union.

Regards,
Alister
 

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hwloc_obj_attr_u::hwloc_bridge_attr_s(3)		     Hardware Locality (hwloc)			  hwloc_obj_attr_u::hwloc_bridge_attr_s(3)

NAME
hwloc_obj_attr_u::hwloc_bridge_attr_s - SYNOPSIS
#include <hwloc.h> Data Fields union { struct hwloc_pcidev_attr_s pci } upstream hwloc_obj_bridge_type_t upstream_type union { struct { unsigned short domain unsigned char secondary_bus unsigned char subordinate_bus } pci } downstream hwloc_obj_bridge_type_t downstream_type unsigned depth Detailed Description Bridge specific Object Attribues. Field Documentation unsigned hwloc_obj_attr_u::hwloc_bridge_attr_s::depth unsigned short hwloc_obj_attr_u::hwloc_bridge_attr_s::domain union { ... } hwloc_obj_attr_u::hwloc_bridge_attr_s::downstream hwloc_obj_bridge_type_t hwloc_obj_attr_u::hwloc_bridge_attr_s::downstream_type struct hwloc_pcidev_attr_s hwloc_obj_attr_u::hwloc_bridge_attr_s::pci struct { ... } hwloc_obj_attr_u::hwloc_bridge_attr_s::pci unsigned char hwloc_obj_attr_u::hwloc_bridge_attr_s::secondary_bus unsigned char hwloc_obj_attr_u::hwloc_bridge_attr_s::subordinate_bus union { ... } hwloc_obj_attr_u::hwloc_bridge_attr_s::upstream hwloc_obj_bridge_type_t hwloc_obj_attr_u::hwloc_bridge_attr_s::upstream_type Author Generated automatically by Doxygen for Hardware Locality (hwloc) from the source code. Version 1.4.1 Mon Feb 27 2012 hwloc_obj_attr_u::hwloc_bridge_attr_s(3)
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