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authormrkn <mrkn@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2016-11-16 04:25:33 +0000
committermrkn <mrkn@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2016-11-16 04:25:33 +0000
commit99378689848418ca391ccdc631b8ffb572c52b15 (patch)
tree48e8461deab01c3ed9f7bd43306c4a13d2783e43
parent5a1f5fac93762299258e7775ccbeba1f00564e88 (diff)
downloadruby-99378689848418ca391ccdc631b8ffb572c52b15.tar.gz
rational.c: optimize Rational#abs
* rational.c (rb_rational_abs): optimize Rational#abs with the specialized implementation. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56808 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
-rw-r--r--rational.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/rational.c b/rational.c
index 1467876724..d9ff5ce344 100644
--- a/rational.c
+++ b/rational.c
@@ -1235,6 +1235,30 @@ nurat_negative_p(VALUE self)
return f_boolcast(INT_NEGATIVE_P(dat->num));
}
+/*
+ * call-seq:
+ * rat.abs -> rat
+ * rat.magnitude -> rat
+ *
+ * Returns the absolute value of +rat+.
+ *
+ * (1/2r).abs #=> 1/2r
+ * (-1/2r).abs #=> 1/2r
+ *
+ * Rational#magnitude is an alias of Rational#abs.
+ */
+
+VALUE
+rb_rational_abs(VALUE self)
+{
+ get_dat1(self);
+ if (INT_NEGATIVE_P(dat->num)) {
+ VALUE num = rb_int_abs(dat->num);
+ return nurat_s_canonicalize_internal_no_reduce(CLASS_OF(self), num, dat->den);
+ }
+ return self;
+}
+
static VALUE
nurat_floor(VALUE self)
{
@@ -2640,6 +2664,8 @@ Init_Rational(void)
#endif
rb_define_method(rb_cRational, "positive?", nurat_positive_p, 0);
rb_define_method(rb_cRational, "negative?", nurat_negative_p, 0);
+ rb_define_method(rb_cRational, "abs", rb_rational_abs, 0);
+ rb_define_method(rb_cRational, "magnitude", rb_rational_abs, 0);
rb_define_method(rb_cRational, "floor", nurat_floor_n, -1);
rb_define_method(rb_cRational, "ceil", nurat_ceil_n, -1);