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getifunvalue

Purpose
Get the content of a union and perform type expansion as necessary.
Synopsis
int getifunvalue(XPRMcontext ctx, int type, XPRMalltypes *value, int expand);
Arguments
ctx 
Mosel's execution context
type 
Type of the referenced value
value 
Pointer to an area where the value is stored (to be updated)
expand 
If non-zero user types will be expanded
Return value
An encoded type, 0 if the reference is an undefined union or -1 in case of error (typically a NULL reference).
Further information
1. If the referenced value is a union the function getunvalue is called and the value is updated with the content of this union, the returned type corresponds to this new value.
2. If the option expand is stated the type will be expanded using gettypeprop: for instance if the encoded type refers to a set of integers the function will return XPRM_STR_SET|XPRM_TYP_INT instead of the code for this type (the expansion is executed only on user types defining arrays, sets or lists).
3. This function will return its type argument and keep value unchanged if it cannot perform any operation.

Parent Topic Union access

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