Sfairadora

  • Reference Guide

is_mutable

is_mutable(lval)
is_mutable(ref)
Determines, whether the specified l-value lval or reference ref (the type Dref) refers to a data item the value of which can be changed. If the data item is mutable, the function returns TRUE. If the data item is constant (read-only), the function returns FALSE.
If the l-value or reference does not refer to an existent data item, an error is returned.

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