global: Handling global entities in programs

This package contains a library to handle global entities. A global entity has a name declared in the program. Its value can be accessed and modified by IO actions. Furthermore, global entities can be declared as persistent so that their values are stored across different program executions.

Currently, it is still experimental so that its interface might be slightly changed in the future.

A global entity g with an initial value v of type t must be declared by:

g :: Global t
g = global v spec

Here, the type t must not contain type variables and spec specifies the storage mechanism for the global entity (see type GlobalSpec in the library).