Specifies how to compute the additional arguments to the converter or NULL.
Specifies the source type.
Specifies the number of additional arguments to the converter or zero.
Specifies the destination type.
Specifies whether or not resources produced by this converter are
sharable or display-specific and when they should be freed.
Specifies a destroy procedure for resources produced by this conversion,
or NULL if no additional action is required to deallocate resources
produced by the converter.
registers the specified type converter and destructor in all application
contexts created by the calling process, including any future application
contexts that may be created.
registers the specified type converter in the single application context
specified. If the same from_type and to_type are specified
in multiple calls to either function, the most recent overrides the
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