diff options
Diffstat (limited to 'enum.c')
-rw-r--r-- | enum.c | 40 |
1 files changed, 40 insertions, 0 deletions
@@ -166,6 +166,45 @@ enum_find(int argc, VALUE *argv, VALUE obj) } static VALUE +find_index_i(VALUE i, VALUE *memo) +{ + if (RTEST(rb_yield(i))) { + memo[0] = UINT2NUM(memo[1]); + rb_iter_break(); + } + memo[1]++; + return Qnil; +} + +/* + * call-seq: + * enum.find_index(ifnone = nil) {| obj | block } => int + * + * Passes each entry in <i>enum</i> to <em>block</em>. Returns the + * index for the first for which <em>block</em> is not <code>false</code>. + * If no object matches, returns <code>nil</code> + * + * (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 } #=> 35 + * + */ + +static VALUE +enum_find_index(VALUE obj) +{ + VALUE memo[2]; + + 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]; + } + return Qnil; +} + +static VALUE find_all_i(VALUE i, VALUE ary) { if (RTEST(rb_yield(i))) { @@ -1173,6 +1212,7 @@ Init_Enumerable(void) 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_all", enum_find_all, 0); rb_define_method(rb_mEnumerable,"select", enum_find_all, 0); rb_define_method(rb_mEnumerable,"reject", enum_reject, 0); |