put_attr/3¶

"put_attr(+ Var,+ Module,+ Value" )

If Var is a variable or attributed variable, set the value for the attribute named Module to Value. If an attribute with this name is already associated with Var, the old value is replaced. Backtracking will restore the old value (i.e., an attribute is a samutable term. See also @ref setarg_51 @"setarg/3"). This predicate raises a representation error if Var is not a variable and a type error if Module is not an atom. 1