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include/ruby/internal/arithmetic/fixnum.h: add doxygen

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Must not be a bad idea to improve documents. [ci skip]
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卜部昌平 2021-01-25 11:55:36 +09:00
parent 98ab286195
commit 887c1f117d
Notes: git 2021-09-10 20:01:19 +09:00 
Merged: https://github.com/ruby/ruby/pull/4815
1 changed files with 23 additions and 7 deletions
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30
include/ruby/internal/arithmetic/fixnum.h
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@ -22,23 +22,39 @@
*/
#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 */