This VMOD implements basic variable in VCL. Well. It's more of an
association list with support for strings, ints and reals.

import var;

sub vcl_recv {

    # count the number of iDevices:
    if (req.http.user-agent ~ iP(od|ad|hone) ) {
       	var.set_int("idevs", var.get_int("i1") + 1 );
    }

There are methods to get and set each type.

Prototype, most should be self-explaining:

Function VOID set(STRING, STRING)
Function STRING get(STRING)

Function VOID global_set(STRING, STRING)
Function STRING global_get(STRING)

Function VOID set_int(STRING, INT)
Function INT get_int(STRING)

Function VOID set_string(STRING, STRING)
Function STRING get_string(STRING)

Function VOID set_real(STRING, REAL)
Function REAL get_real(STRING)

Function VOID set_duration(STRING, DURATION)
Function DURATION get_duration(STRING)

Function VOID clear()

clear() clears the whole variable space.