Initializing help system before first use

# resetunion

Purpose
Reset a union entity.
Synopsis
`int resetunion(XPRMcontext ctx, XPRMunion un);`
Arguments

ctx | Mosel's execution context
un | Reference to a union entity

Return value
0 if the operation succeeded or 1 in case of error.
Further information
This routine restores a union to its initial state: the stored value is released and the entity is marked as undefined. The operation will fail if it is applied to a constant reference.
Related topics
setunvalue.
Parent Topic Union access

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