Initializing help system before first use

# getnextuncomptype

Purpose
Get the next compatible type of a union type.
Synopsis
`void *getnextuncomptype(XPRMcontext ctx, void *ref, int typcode, int *type);`
Arguments

ctx | Mosel's execution context
ref | Reference pointer or NULL
typcode | Type code of the union
type | Returned type ID

Return value
Reference pointer for the next call to getnextuncomptype.
Further information
1. This function is used to enumerate compatible types of a union type. The second parameter is used to store the current location in the list of types; if this parameter is NULL, the first compatible type of the union is returned. This function returns NULL if it is called with the reference to the last type. Otherwise, the returned value can be used as the input parameter ref to get the following type and so on.
2. A union has at least 2 compatible types: the first one is the type used for initialization of the union from a textual representation. An 'any' type is characterized by a 0 value returned for the second (and last) returned type ID.
Related topics
getuntype, getuntypeid, isuncompat.
Parent Topic Union access

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