Use reference counted table in libab.

include/interpreter.h

@@ -6,14 +6,14 @@
 #include "tree.h"
 
 struct libab_interpreter_s {
-    libab_table* base_table;   
+    libab_ref base_table;
     libab_number_impl* impl;
 };
 
 typedef struct libab_interpreter_s libab_interpreter;
 
 void libab_interpreter_init(libab_interpreter* intr,
-                            libab_table* table, libab_number_impl* impl);
+                            libab_ref* table, libab_number_impl* impl);
 libab_result libab_interpreter_run(libab_interpreter* intr,
                                    libab_tree* tree, libab_ref* into);
 void libab_interpreter_free(libab_interpreter* intr);

include/libabacus.h

@@ -29,7 +29,7 @@ struct libab_s {
      * The table used to store top-level
      * things like functions and operators.
      */
-    libab_table table;
+    libab_ref table;
     /**
      * The number implementation used by this instance.
      */

include/parser.h

@@ -12,7 +12,7 @@
  * tokens into trees.
  */
 struct libab_parser_s {
-    libab_table* base_table;
+    libab_ref base_table;
 };
 
 typedef struct libab_parser_s libab_parser;
@@ -22,7 +22,7 @@ typedef struct libab_parser_s libab_parser;
  * @param parser the parser to intialize.
  * @param table the table of "reserved" entries like operators.
  */
-void libab_parser_init(libab_parser* parser, libab_table* table);
+void libab_parser_init(libab_parser* parser, libab_ref* table);
 /**
  * Parses the given list of tokens into the given tree pointer.
  * @param parser the parser to use for parsing text.

include/util.h

@@ -65,5 +65,12 @@ libab_result libab_resolve_parsetype(libab_parsetype* to_resolve,
  */
 libab_result libab_instantiate_basetype(libab_basetype* to_instantiate,
         libab_ref* into, size_t n, ...);
+/**
+ * Creates a new libab_table, and stores it into the given reference.
+ * @param into the reference to store the table into.
+ * @param parent the parent reference to store.
+ * @return the result of the instantiation.
+ */
+libab_result libab_create_table(libab_ref* into, libab_ref* parent);
 
 #endif