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/*

 *  R : A Computer Language for Statistical Data Analysis

 *  Copyright (C) 2000, 2026 The R Core Team.

 *

 *  This header file 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 file is part of R. R is distributed under the terms of the

 *  GNU General Public License, either Version 2, June 1991 or Version 3,

 *  June 2007. See doc/COPYRIGHTS for details of the copyright status of R.

 *

 *  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

 *  https://www.R-project.org/Licenses/

 */

/* Included by R.h: API */

#ifndef R_EXT_BOOLEAN_H_

#define R_EXT_BOOLEAN_H_

#if !defined(R_INCLUDE_BOOLEAN_H) || R_INCLUDE_BOOLEAN_H

// NB: there is a version of this in Rmath.h0[.in]

#undef FALSE

#undef TRUE

/* Ensuure a 'bool' type is available.  We could use

   __bool_true_false_are_defined, 

   but that was declared obsolescent in C23.

*/

#if defined __STDC_VERSION__ && __STDC_VERSION__ > 202000L

// C23 so bool is a keyword

#elif defined __cplusplus

// part of C++ >= 11, which is all R supports.

#else

# include <stdbool.h>

// stdbool.h is C99, so available everywhere.

#endif

#include <Rconfig.h> /* for HAVE_ENUM_BASE_TYPE */

/*

  Setting the underlying aka base type is supported in C23, C++11 

  and some C compilers based on clang and some versions of GCC.

  What matters here is the C compiler used to build R.

 */

#ifdef  __cplusplus

extern "C" {

#endif

#ifdef HAVE_ENUM_BASE_TYPE

// Apple clang 17 warns even in C23 mode: gcc warns about #pragma clang

// LLVM clang no longer warns.

// Apple clang 21 no longer has that warning.

# if defined  __APPLE__ && defined __clang__ && __clang_major__ < 21

#  pragma clang diagnostic push

#  pragma clang diagnostic ignored "-Wfixed-enum-extension"

# endif

  typedef enum :int { FALSE = 0, TRUE } Rboolean;  // so NOT NA

# if defined  __APPLE__ && defined __clang__ && __clang_major__ < 21

#  pragma clang diagnostic pop

# endif

#else

    typedef enum { FALSE = 0, TRUE } Rboolean;  // so NOT NA

#endif

#ifdef  __cplusplus

}

#endif

#else

/* The Rbolean type is used in too many R headers to condition them

 * all.  However, people defining R_INCLUDE_BOOLEAN_H=0 should not be

 * using it in their own code, and its base type is expected to be int

 * (and guaranteed to be on most platforms as from R 4.5.0). */

    typedef Rboolean int;

#endif /* R_INCLUDE_BOOLEAN_H = 0 */

#endif /* R_EXT_BOOLEAN_H_ */