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/*
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* R : A Computer Language for Statistical Data Analysis
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* Copyright (C) 2001-2025 The R Core Team.
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*
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* This header file is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This file is part of R. R is distributed under the terms of the
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* GNU General Public License, either Version 2, June 1991 or Version 3,
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* June 2007. See doc/COPYRIGHTS for details of the copyright status of R.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, a copy is available at
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* https://www.R-project.org/Licenses/
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*/
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/*
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Not part of the API, subject to change at any time.
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*/
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#ifndef R_CALLBACKS_H
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#define R_CALLBACKS_H
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/**
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These structures are for C (and R function) top-level task handlers.
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Such routines are called at the end of every (successful) top-level task
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in the regular REPL.
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*/
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#include <Rinternals.h>
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/**
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The signature of the C routine that a callback must implement.
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expr - the expression for the top-level task that was evaluated.
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value - the result of the top-level task, i.e. evaluating expr.
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succeeded - a logical value indicating whether the task completed properly.
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visible - a logical value indicating whether the result was printed to the R ``console''/stdout.
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data - user-level data passed to the registration routine.
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*/
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typedef Rboolean (*R_ToplevelCallback)(SEXP expr, SEXP value, Rboolean succeeded, Rboolean visible, void *);
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typedef struct _ToplevelCallback R_ToplevelCallbackEl;
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/**
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Linked list element for storing the top-level task callbacks.
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*/
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struct _ToplevelCallback {
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R_ToplevelCallback cb; /* the C routine to call. */
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void *data; /* the user-level data to pass to the call to cb() */
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void (*finalizer)(void *data); /* Called when the callback is removed. */
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char *name; /* a name by which to identify this element. */
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R_ToplevelCallbackEl *next; /* the next element in the linked list. */
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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Rboolean Rf_removeTaskCallbackByIndex(int id);
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Rboolean Rf_removeTaskCallbackByName(const char *name);
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R_ToplevelCallbackEl* Rf_addTaskCallback(R_ToplevelCallback cb, void *data, void (*finalizer)(void *), const char *name, int *pos);
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#ifdef __cplusplus
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}
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#endif
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#endif /* R_CALLBACKS_H */
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