[ruby-talk:178495] ãŒç™ºç«¯ã§ Enumerable#find_index ã¨ã„ã†ã®ãŒ
以å‰è¿½åŠ ã•ã‚Œã¾ã—ãŸãŒã€æ©Ÿèƒ½çš„ã«ã¯ Array#index ã®ã‚µãƒ–セットã§ã™ã€‚
(index ã¯ãƒ–ãƒãƒƒã‚¯è©•ä¾¡ã€æŒ‡å®šå€¤ã¨ã®æ¯”較を両サãƒãƒ¼ãƒˆ)
　Array 以外ã§ã¯ #index(value) ã«ç›¸å½“ã™ã‚‹æ©Ÿèƒ½ãŒãªã„ã®ã§ã€
Enumerable#find_index(value) をサãƒãƒ¼ãƒˆã—ã¦ã¯ã©ã†ã§ã—ょã†ã‹ã€‚
(ãã—㦠Array ã§ã¯åŠ¹çŽ‡ã®ãŸã‚ alias find_index index ã—ã¾ã™)
Index: enum.c
— enum.c (revision 15954)
+++ enum.c (working copy)
@@ -186,8 +186,19 @@
}
static VALUE
-find_index_i(VALUE i, VALUE *memo, int argc, VALUE *argv)
+find_index_i(VALUE i, VALUE *memo)
{
- if (rb_equal(i, memo[2])) {
- memo[0] = UINT2NUM(memo[1]);
- rb_iter_break();
- }
- memo[1]++;
- return Qnil;
+}
+static VALUE
+find_index_iter_i(VALUE i, VALUE *memo, int argc, VALUE *argv)
+{
if (RTEST(enum_yield(argc, argv))) {
memo[0] = UINT2NUM(memo[1]);
rb_iter_break();
@@ -198,30 +209,48 @@
/*
- call-seq:
-
-
enum.find_index() {| obj | block } => int
-
-
-
enum.find_index(value) => int or nil
-
-
-
enum.find_index {| obj | block } => int or nil
-
-
- Passes each entry in enum to block. Returns the
-
- index for the first for which block is not
false.
- index for the first for which block is not
-
- If no object matches, returns
nil
- If no object matches, returns
-
- Compares each entry in enum with value or passes
-
- to block. Returns the index for the first for which the
-
- evaluated value is non-false. If no object matches, returns
-
nil-
(1..10).find_index {|i| i % 5 == 0 and i % 7 == 0 } #=> nil -
(1..100).find_index {|i| i % 5 == 0 and i % 7 == 0 } #=> 34
-
-
(1..100).find_index(50) #=> 49
-
static VALUE
-enum_find_index(VALUE obj)
+enum_find_index(int argc, VALUE *argv, VALUE obj)
{
- VALUE memo[2];
- VALUE memo[3]; /* [return value, current index, condition value]
*/ - rb_block_call_func *func;
- RETURN_ENUMERATOR(obj, 0, 0);
- memo[0] = Qundef;
- memo[1] = 0;
- rb_block_call(obj, id_each, 0, 0, find_index_i, (VALUE)memo);
- if (memo[0] != Qundef) {
- return memo[0];
- if (argc == 0) {
-
RETURN_ENUMERATOR(obj, 0, 0); -
memo[0] = Qnil; -
memo[1] = 0; -
memo[2] = Qundef; -
}func = find_index_iter_i;
- return Qnil;
- else {
-
VALUE item; - if (rb_block_given_p()) {
-
rb_warn("given block not used"); - }
- rb_scan_args(argc, argv, “1”, &item);
-
memo[0] = Qnil; -
memo[1] = 0; -
memo[2] = item; -
func = find_index_i; - }
- rb_block_call(obj, id_each, 0, 0, func, (VALUE)memo);
- return memo[0];
}
static VALUE
@@ -1688,7 +1717,7 @@
rb_define_method(rb_mEnumerable,“count”, enum_count, -1);
rb_define_method(rb_mEnumerable,“find”, enum_find, -1);
rb_define_method(rb_mEnumerable,“detect”, enum_find, -1);
- rb_define_method(rb_mEnumerable,“find_index”, enum_find_index, 0);
- rb_define_method(rb_mEnumerable,“find_index”, enum_find_index, -1);
rb_define_method(rb_mEnumerable,“find_all”, enum_find_all, 0);
rb_define_method(rb_mEnumerable,“select”, enum_find_all, 0);
rb_define_method(rb_mEnumerable,“reject”, enum_reject, 0);
Index: array.c
===================================================================
— array.c (revision 15954)
+++ array.c (working copy)
@@ -877,6 +877,8 @@
-
a.index("b") #=> 1 -
a.index("z") #=> nil -
a.index{|x|x=="b"} #=> 1
-
-
- This is an alias of
#find_index.
*/
- This is an alias of
static VALUE
@@ -3378,6 +3380,7 @@
rb_define_method(rb_cArray, “length”, rb_ary_length, 0);
rb_define_alias(rb_cArray, “size”, “length”);
rb_define_method(rb_cArray, “empty?”, rb_ary_empty_p, 0);
- rb_define_method(rb_cArray, “find_index”, rb_ary_index, -1);
rb_define_method(rb_cArray, “index”, rb_ary_index, -1);
rb_define_method(rb_cArray, “rindex”, rb_ary_rindex, -1);
rb_define_method(rb_cArray, “join”, rb_ary_join_m, -1);