Remove the implementation struct.

include/interpreter.h

@@ -2,18 +2,16 @@
 #define LIBABACUS_INTERPRETER_H
 
 #include "table.h"
-#include "number.h"
 #include "tree.h"
 
 struct libab_interpreter_s {
     libab_ref base_table;
-    libab_number_impl* impl;
 };
 
 typedef struct libab_interpreter_s libab_interpreter;
 
 void libab_interpreter_init(libab_interpreter* intr,
-                            libab_ref* table, libab_number_impl* impl);
+                            libab_ref* table);
 libab_result libab_interpreter_run(libab_interpreter* intr,
                                    libab_tree* tree, libab_ref* into);
 void libab_interpreter_free(libab_interpreter* intr);

include/libabacus.h

@@ -8,7 +8,6 @@
 #include "interpreter.h"
 #include "result.h"
 #include "table.h"
-#include "number.h"
 
 /**
  * The main struct of libabacus,
@@ -36,10 +35,6 @@ struct libab_s {
      * things like functions and operators.
      */
     libab_ref table;
-    /**
-     * The number implementation used by this instance.
-     */
-    libab_number_impl impl;
 };
 
 typedef struct libab_s libab;

include/number.h

@@ -1,37 +0,0 @@
-#ifndef LIBABACUS_NUMBER_H
-#define LIBABACUS_NUMBER_H
-
-typedef void (*libab_num_function)(void*, void*, void*);
-typedef void (*libab_num_function_unary)(void*, void*);
-
-/**
- * Struct that holds information
- * about the implementation of numbers
- * that is being used by libab. This is not
- * assumed or inferred, and it's necessary to
- * provide all of these definitions.
- */
-struct libab_number_impl_s {
-    /**
-     * The function used to allocate a number.
-     */
-    void* (*allocate)();
-    /**
-     * The function used to free a number.
-     */
-    void (*free)(void*);
-    /**
-     * The function used to construct a number
-     * out of a string.
-     */
-    void* (*parse)(const char*);
-    /**
-     * A function to copy the value of one number
-     * into the value of another.
-     */
-    void (*copy)(void*, void*);
-};
-
-typedef struct libab_number_impl_s libab_number_impl;
-
-#endif