diff options
Diffstat (limited to 'include/ruby/internal/arithmetic/fixnum.h')
| -rw-r--r-- | include/ruby/internal/arithmetic/fixnum.h | 32 |
1 files changed, 24 insertions, 8 deletions
diff --git a/include/ruby/internal/arithmetic/fixnum.h b/include/ruby/internal/arithmetic/fixnum.h index 68544b760b..c8927ac824 100644 --- a/include/ruby/internal/arithmetic/fixnum.h +++ b/include/ruby/internal/arithmetic/fixnum.h @@ -17,28 +17,44 @@ * 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. + * extension libraries. They could be written in C++98. * @brief Handling of integers formerly known as Fixnums. */ #include "ruby/backward/2/limits.h" -#define FIXABLE RB_FIXABLE -#define FIXNUM_MAX RUBY_FIXNUM_MAX -#define FIXNUM_MIN RUBY_FIXNUM_MIN -#define NEGFIXABLE RB_NEGFIXABLE -#define POSFIXABLE RB_POSFIXABLE +#define FIXABLE RB_FIXABLE /**< @old{RB_FIXABLE} */ +#define FIXNUM_MAX RUBY_FIXNUM_MAX /**< @old{RUBY_FIXNUM_MAX} */ +#define FIXNUM_MIN RUBY_FIXNUM_MIN /**< @old{RUBY_FIXNUM_MIN} */ +#define NEGFIXABLE RB_NEGFIXABLE /**< @old{RB_NEGFIXABLE} */ +#define POSFIXABLE RB_POSFIXABLE /**< @old{RB_POSFIXABLE} */ -/* +/** + * Checks if the passed value is in range of fixnum, assuming it is a positive + * number. Can sometimes be useful for C's unsigned integer types. + * + * @internal + * * FIXABLE can be applied to anything, from double to intmax_t. The problem is * double. On a 64bit system RUBY_FIXNUM_MAX is 4,611,686,018,427,387,903, * which is not representable by a double. The nearest value that a double can * represent is 4,611,686,018,427,387,904, which is not fixable. The - * seemingly-stragne "< FIXNUM_MAX + 1" expression below is due to this. + * seemingly-strange "< FIXNUM_MAX + 1" expression below is due to this. */ #define RB_POSFIXABLE(_) ((_) < RUBY_FIXNUM_MAX + 1) + +/** + * Checks if the passed value is in range of fixnum, assuming it is a negative + * number. This is an implementation of #RB_FIXABLE. Rarely used stand alone. + */ #define RB_NEGFIXABLE(_) ((_) >= RUBY_FIXNUM_MIN) + +/** Checks if the passed value is in range of fixnum */ #define RB_FIXABLE(_) (RB_POSFIXABLE(_) && RB_NEGFIXABLE(_)) + +/** Maximum possible value that a fixnum can represent. */ #define RUBY_FIXNUM_MAX (LONG_MAX / 2) + +/** Minimum possible value that a fixnum can represent. */ #define RUBY_FIXNUM_MIN (LONG_MIN / 2) #endif /* RBIMPL_ARITHMETIC_FIXNUM_H */ |