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+/*
+ *  R : A Computer Language for Statistical Data Analysis
+ *  Copyright (C) 2001-2 The R Core Team.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation; either version 2.1 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with this program; if not, a copy is available at
+ *  http://www.r-project.org/Licenses/
+ */
+
+/* 
+   Not part of the API, subject to change at any time.
+*/
+
+#ifndef R_CALLBACKS_H
+#define R_CALLBACKS_H
+
+/**
+  These structures are for C (and R function) top-level task handlers.
+  Such routines are called at the end of every (successful) top-level task
+  in the regular REPL. 
+ */
+
+#include <Rinternals.h>
+/**
+  The signature of the C routine that a callback must implement.
+  expr - the expression for the top-level task that was evaluated.
+  value - the result of the top-level task, i.e. evaluating expr.
+  succeeded - a logical value indicating whether the task completed propertly.
+  visible - a logical value indicating whether the result was printed to the R ``console''/stdout.
+  data - user-level data passed to the registration routine.
+ */
+typedef Rboolean (*R_ToplevelCallback)(SEXP expr, SEXP value, Rboolean succeeded, Rboolean visible, void *);
+
+typedef struct _ToplevelCallback  R_ToplevelCallbackEl;
+/** 
+ Linked list element for storing the top-level task callbacks.
+ */
+struct _ToplevelCallback {
+    R_ToplevelCallback cb; /* the C routine to call. */
+    void *data;            /* the user-level data to pass to the call to cb() */
+    void (*finalizer)(void *data); /* Called when the callback is removed. */
+
+    char *name;  /* a name by which to identify this element. */ 
+
+    R_ToplevelCallbackEl *next; /* the next element in the linked list. */
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+Rboolean Rf_removeTaskCallbackByIndex(int id);
+Rboolean Rf_removeTaskCallbackByName(const char *name);
+SEXP R_removeTaskCallback(SEXP which);
+R_ToplevelCallbackEl* Rf_addTaskCallback(R_ToplevelCallback cb, void *data, void (*finalizer)(void *), const char *name, int *pos);
+
+
+
+/*
+  The following definitions are for callbacks to R functions and
+  methods related to user-level tables.  This was implemented in a
+  separate package on Omegahat and these declarations allow the package
+  to interface to the internal R code.
+  
+  See http://developer.r-project.org/RObjectTables.pdf,
+  http://www.omegahat.org/RObjectTables/
+*/
+
+typedef struct  _R_ObjectTable R_ObjectTable;
+
+/* Do we actually need the exists() since it is never called but R
+   uses get to see if the symbol is bound to anything? */
+typedef Rboolean (*Rdb_exists)(const char * const name, Rboolean *canCache, R_ObjectTable *);
+typedef SEXP     (*Rdb_get)(const char * const name, Rboolean *canCache, R_ObjectTable *);
+typedef int      (*Rdb_remove)(const char * const name, R_ObjectTable *);
+typedef SEXP     (*Rdb_assign)(const char * const name, SEXP value, R_ObjectTable *);
+typedef SEXP     (*Rdb_objects)(R_ObjectTable *);
+typedef Rboolean (*Rdb_canCache)(const char * const name, R_ObjectTable *);
+
+typedef void     (*Rdb_onDetach)(R_ObjectTable *);
+typedef void     (*Rdb_onAttach)(R_ObjectTable *);
+
+struct  _R_ObjectTable{
+  int       type;
+  char    **cachedNames;
+  Rboolean  active;
+
+  Rdb_exists   exists;
+  Rdb_get      get;
+  Rdb_remove   remove;
+  Rdb_assign   assign;
+  Rdb_objects  objects;
+  Rdb_canCache canCache;
+
+  Rdb_onDetach onDetach;
+  Rdb_onAttach onAttach;
+  
+  void     *privateData;
+};
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* R_CALLBACKS_H */