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package generic_list_mwe_pkg is
generic (
type g_element_t);
type elementp_t is access g_element_t;
type g_list is protected
impure function pull return g_element_t;
end protected;
end package generic_list_mwe_pkg;
package body generic_list_mwe_pkg is
type g_list is protected body
type list_obj_t;
type listp_t is access list_obj_t;
type list_obj_t is record
element : elementp_t; -- pointer to element
nxt : listp_t; -- pointer to next list_obj
end record;
variable list : listp_t;
impure function pull
return g_element_t is
variable v_list : listp_t;
variable v_elementp : elementp_t;
impure function delete_and_return
return g_element_t is
variable ret : v_elementp.all'subtype;
begin -- function delete_and_return
ret := v_elementp.all; -- Create a constrained copy of last element in list
list := list.nxt;
deallocate(v_list.element);
deallocate(v_list);
return ret;
end function delete_and_return;
begin
assert list/=null report "Tried to pull element from empty list" severity error;
v_list := list;
v_elementp := list.element;
return delete_and_return;
end function;
end protected body;
end generic_list_mwe_pkg;
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