Issue #4653 has been updated by Shota Fukumori. ??±é?????convension?????¨æ?????????¨ç?ºæ?£ã???????¨æ?¸ã???????¦ã???????®ã?«ã????£ã?¦ã????¾ã????¾ã??????????? Enumerator#defer???å®?義ã????¦ã????®ã???????ªå½¢??«ã???????¨è?¯ã????®ã?§ã?¯ã?¨æ???????¾ã???????? ???人ç????«è??????????¯ã????????ä¸???ªã????£ã???????????ªã???????¨æ???????¾ã????? [1,2,3].map.defer{|x| x*2 }.each_with_index.map.defer do |x,i| "#{x}: #{i}" end.each {|x| puts x } ???????????§ã?????????????? ?????????: https://gist.github.com/964510 ---------------------------------------- Feature #4653: [PATCH 1/1] new method Enumerable#rude_map http://redmine.ruby-lang.org/issues/4653 Author: Shyouhei Urabe Status: Assigned Priority: Normal Assignee: Yukihiro Matsumoto Category: core Target version: 1.9.3 From e6dd7bd9b5769bae5d81416da7a2b4003a43ba06 Mon Sep 17 00:00:00 2001 Message-Id: <e6dd7bd9b5769bae5d81416da7a2b4003a43ba06.1304863013.git.shyouhei / ruby-lang.org> From: URABE, Shyouhei <shyouhei / ruby-lang.org> Date: Sun, 8 May 2011 22:51:28 +0900 Subject: [PATCH 1/1] new method Enumerable#rude_map ?????¨ã?????map????????????è¿??????ªã????¹ã??????????®ã?«ã?¨æ??????????¨ã??????????¾ã????? ä¾???¨ã????¦ã??lzma??§å?§ç¸®????????¦ã?????è§£å??????????¨ã?¨ã?¦ã??大ã??????ªã???????ã?¹ã???????? ??¤ã?«ã???????£ã????¨ã????¦ã???????????è§£å???????¦è????ªå????µã?£ã?¦ã?????HTML escape?????? <pre></pre>??§ã?¯ã???????§ã???????£ç?????????????®ã??lzma??§å?§ç¸®?????ªã?????å¿?è¦?????????? ?????¨ã????¾ã??(æ³?:å®?è©?)???????????§ã??è¡???ªå????µã?£ã?¦ã????¨ã??HTML escape?????¦ã????? ç´???´ã?«è??????????¨ã??lzcat???popen???????????®ã?«å¯¾?????? io.each_line.map.with_index.map. ... ??¨ã????????æ§???????Ruby??¨ã????¦ã?¯è?ªç?? ?????¨æ???????¾ã???????????map????????????ä½???£ã?¦ã????¾ã????¨ã???????®ã????¡ã?¢ã?ªæ??è²»é??????? ?????????????¾ã??????????§ã????????Enumerator??§ã????£ã???????¨å?¦ç?????????????¨ã???????§ã????? ??¨ã?????????????map??ªã??????????©é?????????????ªã????Enumerator???è¿????map??®å??種ã????? ?????¨ã???????¨ã??????????®ã?§ã???????©ã????§ã??????????????1.9??«ã?¯ã?????flat_map???????????? ??§ã?ªã????¨ã??_map???å¢???????å¿?????????µæ????¯å????ªã???????ªã?¨æ???????®ã?§æ?°è???¡ã?½ã???????? ?????¦ã?¿ã?¾ã????????????????ªã??map??®æ?»ã????¤ã?®å?????å¤????????®ã?§ã??ç§???¯ã???????§ã???????? ??¡ã????£ã?¨ã?????????? ????¨ã??????????¾ã????? Signed-off-by: URABE, Shyouhei <shyouhei / ruby-lang.org> diff --git a/enum.c b/enum.c index 584b838..449406b 100644 --- a/enum.c +++ b/enum.c @@ -462,6 +462,41 @@ enum_flat_map(VALUE obj) return ary; } +static VALUE +rude_map_ii(VALUE i, VALUE y, int c, VALUE *v) +{ + return rb_funcall(y, rb_intern("<<"), 1, enum_yield(c, v)); +} + +static VALUE +rude_map_i(VALUE y, VALUE i, int c, VALUE *v) +{ + return rb_block_call(i, id_each, 0, 0, rude_map_ii, y); +} + +/* + * call-seq: + * enum.rude_map {| obj | block } -> enumerator + * enum.rude_map -> enumerator + * + * Identical to Enumerable#map, except that it returns an enumerator + * rather than an array. + * + * Without a block it is just another Object#to_enum. + * + */ + +static VALUE +enum_rude_map(VALUE obj) +{ + VALUE ret; + RETURN_ENUMERATOR(obj, 0, 0); + + ret = rb_obj_alloc(rb_cEnumerator); + rb_block_call(ret, rb_intern("initialize"), 0, 0, rude_map_i, obj); + return ret; +} + /* * call-seq: * enum.to_a -> array @@ -2679,6 +2714,7 @@ Init_Enumerable(void) rb_define_method(rb_mEnumerable, "collect", enum_collect, 0); rb_define_method(rb_mEnumerable, "map", enum_collect, 0); rb_define_method(rb_mEnumerable, "flat_map", enum_flat_map, 0); + rb_define_method(rb_mEnumerable, "rude_map", enum_rude_map, 0); rb_define_method(rb_mEnumerable, "collect_concat", enum_flat_map, 0); rb_define_method(rb_mEnumerable, "inject", enum_inject, -1); rb_define_method(rb_mEnumerable, "reduce", enum_inject, -1); -- 1.7.0.4 -- http://redmine.ruby-lang.org