#ifndef RBIMPL_VALUE_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_VALUE_H
/**
* @file
* @author Ruby developers <ruby-core@ruby-lang.org>
* @copyright This file is a part of the programming language Ruby.
* Permission is hereby granted, to either redistribute and/or
* modify this file, provided that the conditions mentioned in the
* file COPYING are met. Consult the file for details.
* @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
* implementation details. Don't take them as canon. They could
* rapidly appear then vanish. The name (path) of this header file
* is also an implementation detail. Do not expect it to persist
* at the place it is now. Developers are free to move it anywhere
* anytime at will.
* @note To ruby-core: remember that this header can be possibly
* recursively included from extension libraries written in C++.
* Do not expect for instance `__VA_ARGS__` is always available.
* We assume C99 for ruby itself but we don't assume languages of
* extension libraries. They could be written in C++98.
* @brief Defines ::VALUE and ::ID.
*/
#include "ruby/internal/static_assert.h"
#include "ruby/backward/2/long_long.h"
#include "ruby/backward/2/limits.h"
#if defined(__DOXYGEN__)
/**
* Type that represents a Ruby object. It is an unsigned integer of some kind,
* depending on platforms.
*
* ```CXX
* VALUE value = rb_eval_string("ARGF.readlines.map.with_index");
* ```
*
* @warning ::VALUE is not a pointer.
* @warning ::VALUE can be wider than `long`.
*/
typedef uintptr_t VALUE;
/**
* Type that represents a Ruby identifier such as a variable name.
*
* ```CXX
* ID method = rb_intern("method");
* VALUE result = rb_funcall(obj, method, 0);
* ```
*
* @note ::rb_cSymbol is a Ruby-level data type for the same thing.
*/
typedef uintptr_t ID;
/**
* A signed integer type that has the same width with ::VALUE.
*
* @internal
*
* @shyouhei wonders: is it guaranteed that `uintptr_t` and `intptr_t` are the
* same width? As far as I read ISO/IEC 9899:2018 section 7.20.1.4 paragraph 1
* no such description is given... or defined elsewhere?
*/
typedef intptr_t SIGNED_VALUE;
/**
* Identical to `sizeof(VALUE)`, except it is a macro that can also be used
* inside of preprocessor directives such as `#if`. Handy on occasions.
*/
#define SIZEOF_VALUE SIZEOF_UINTPTR_T
/**
* @private
*
* A compile-time constant of type ::VALUE whose value is 0.
*/
#define RBIMPL_VALUE_NULL UINTPTR_C(0)
/**
* @private
*
* A compile-time constant of type ::VALUE whose value is 1.
*/
#define RBIMPL_VALUE_ONE UINTPTR_C(1)
/**
* @private
*
* Maximum possible value that a ::VALUE can take.
*/
#define RBIMPL_VALUE_FULL UINTPTR_MAX
#elif defined HAVE_UINTPTR_T && 0
typedef uintptr_t VALUE;
typedef uintptr_t ID;
# define SIGNED_VALUE intptr_t
# define SIZEOF_VALUE SIZEOF_UINTPTR_T
# undef PRI_VALUE_PREFIX
# define RBIMPL_VALUE_NULL UINTPTR_C(0)
# define RBIMPL_VALUE_ONE UINTPTR_C(1)
# define RBIMPL_VALUE_FULL UINTPTR_MAX
#elif SIZEOF_LONG == SIZEOF_VOIDP
typedef unsigned long VALUE;
typedef unsigned long ID;
# define SIGNED_VALUE long
# define SIZEOF_VALUE SIZEOF_LONG
# define PRI_VALUE_PREFIX "l"
# define RBIMPL_VALUE_NULL 0UL
# define RBIMPL_VALUE_ONE 1UL
# define RBIMPL_VALUE_FULL ULONG_MAX
#elif SIZEOF_LONG_LONG == SIZEOF_VOIDP
typedef unsigned LONG_LONG VALUE;
typedef unsigned LONG_LONG ID;
# define SIGNED_VALUE LONG_LONG
# define LONG_LONG_VALUE 1
# define SIZEOF_VALUE SIZEOF_LONG_LONG
# define PRI_VALUE_PREFIX PRI_LL_PREFIX
# define RBIMPL_VALUE_NULL 0ULL
# define RBIMPL_VALUE_ONE 1ULL
# define RBIMPL_VALUE_FULL ULLONG_MAX
#else
# error ---->> ruby requires sizeof(void*) == sizeof(long) or sizeof(LONG_LONG) to be compiled. <<----
#endif
/** @cond INTERNAL_MACRO */
RBIMPL_STATIC_ASSERT(sizeof_int, SIZEOF_INT == sizeof(int));
RBIMPL_STATIC_ASSERT(sizeof_long, SIZEOF_LONG == sizeof(long));
RBIMPL_STATIC_ASSERT(sizeof_long_long, SIZEOF_LONG_LONG == sizeof(LONG_LONG));
RBIMPL_STATIC_ASSERT(sizeof_voidp, SIZEOF_VOIDP == sizeof(void *));
/** @endcond */
#endif /* RBIMPL_VALUE_H */
