diff options
author | mrkn <mrkn@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2016-11-16 04:25:33 +0000 |
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committer | mrkn <mrkn@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2016-11-16 04:25:33 +0000 |
commit | ab9b7890c287ac55e7e261cbab1ed1664d9b66a8 (patch) | |
tree | 48e8461deab01c3ed9f7bd43306c4a13d2783e43 /rational.c | |
parent | b252126d6d0d0c9ba29583fa5fd7866304b21ebc (diff) |
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
Diffstat (limited to 'rational.c')
-rw-r--r-- | rational.c | 26 |
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); |