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add flo_prev_or_next func

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S-H-GAMELINKS 2020-11-16 13:22:47 +09:00 committed by Nobuyoshi Nakada
parent 1800f3fa5c
commit d79cdcb113
Notes: git 2020-11-20 11:48:12 +09:00 
Merged: https://github.com/ruby/ruby/pull/3769
1 changed files with 21 additions and 8 deletions
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29
numeric.c
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@ -1820,6 +1820,25 @@ rb_flo_is_finite_p(VALUE num)
return Qtrue; return Qtrue;
} }
enum flo_prevnext_flags
{
FLOAT_PREV = 0,
FLOAT_NEXT = 1
};
static VALUE
flo_prev_or_next(VALUE flo, int flag)
{
double x, y;
x = NUM2DBL(flo);
if (flag == 1)
y = nextafter(x, HUGE_VAL);
else
y = nextafter(x, -HUGE_VAL);
return DBL2NUM(y);
}
/* /*
* call-seq: * call-seq:
* float.next_float -> float * float.next_float -> float
@ -1875,10 +1894,7 @@ rb_flo_is_finite_p(VALUE num)
static VALUE static VALUE
flo_next_float(VALUE vx) flo_next_float(VALUE vx)
{ {
double x, y; return flo_prev_or_next(vx, FLOAT_NEXT);
x = NUM2DBL(vx);
y = nextafter(x, HUGE_VAL);
return DBL2NUM(y);
} }
/* /*
@ -1926,10 +1942,7 @@ flo_next_float(VALUE vx)
static VALUE static VALUE
flo_prev_float(VALUE vx) flo_prev_float(VALUE vx)
{ {
double x, y; return flo_prev_or_next(vx, FLOAT_PREV);
x = NUM2DBL(vx);
y = nextafter(x, -HUGE_VAL);
return DBL2NUM(y);
} }
/* /*