Initializing help system before first use

gettypeid

Purpose
Get the type ID of a set, list, array or union.
Synopsis
int gettypeid(XPRMcontext ctx, int st, void *ref);
Arguments
ctx 
Mosel's execution context
st 
Structure of the reference ( e.g. XPRM_STRUCT_ARRAY)
ref 
A reference to the entity
Return value
A type ID, 0 if the entity is not a reference to a user type and -1 in case of error (NULL reference of invalid structure).
Example
Considering the following definitions and assuming that ref1 refers to S1 and ref2 refers to S2, the call gettypeid(ctx, XPRM_STR_SET, ref1) will report a positive value (the type ID of myset) while gettypeid(ctx, XPRM_STR_SET, ref2) will return 0 (because this set is not an instance of any user type). 
declarations
   myset=set of integer
   S1:myset
   S2:set of integer
end-declarations
Further information
This function can be applied to arrays ( XPRM_STRUCT_ARRAY), sets ( XPRM_STRUCT_SET), lists ( XPRM_STRUCT_LIST) and unions ( XPRM_STRUCT_UNION). It will return a non-zero value only if the corresponding reference is an instance of a user-defined type.

Parent Topic Miscellaneous

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