Interpreted programs may access some of the state of the application via variables.
Variables are introduced to the imperative language interpreter through variables collections (and not through a more flexible context and lookup method specification, like for the expression evaluator).
Variables collections are application wise typeless. They are declared as
pointers (to void presumably) and initialized with
NULL. A single
collection is allowed for program parsing, and it is linked into the parsing
struct x1f4_c1_type one) via
field of the parsing context.
See struct x1f4_c1_type.
Adding variables to variables collections is convenienced by the
Variables collections may be examined via the
Once variables collections are no longer of use they are to be disposed via the
x1f4_air_state function. Executable program representations do refer
variables in the variables collection in use during the construction of such
representations, hence disposing of variables collections should not occur
before the disposal of the executable program representations referring them.
The variable collections are regular libaime named objects collections,
and can be operated via specific methods. The one exception is their initial
NULL state - in this state they are not named objects collections.
See Named Objects Collections.