diff options
author | knu <knu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2008-05-14 03:46:37 +0000 |
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committer | knu <knu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2008-05-14 03:46:37 +0000 |
commit | 921fb6ae2593d07d35df0f1f487b9d64a0db9520 (patch) | |
tree | f29281bb0c0e6e941876fdc629adf1d31e1283c8 /array.c | |
parent | 5e4edb43a2a3183931b3d891b1c4bd6031b73560 (diff) |
* array.c (rb_ary_count): Override Enumerable#count for better
performance.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@16412 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'array.c')
-rw-r--r-- | array.c | 44 |
1 files changed, 44 insertions, 0 deletions
@@ -2776,6 +2776,49 @@ rb_ary_nitems(VALUE ary) return LONG2NUM(n); } +/* + * call-seq: + * array.count(obj) -> int + * array.count { |item| block } -> int + * + * Returns the number of elements which equals to <i>obj</i>. + * If a block is given, counts tthe number of elements yielding a true value. + * + * ary = [1, 2, 4, 2] + * ary.count(2) # => 2 + * ary.count{|x|x%2==0} # => 3 + * + */ + +static VALUE +rb_ary_count(int argc, VALUE *argv, VALUE ary) +{ + long n = 0; + + if (argc == 0) { + VALUE *p, *pend; + + RETURN_ENUMERATOR(ary, 0, 0); + + for (p = RARRAY_PTR(ary), pend = p + RARRAY_LEN(ary); p < pend; p++) { + if (RTEST(rb_yield(*p))) n++; + } + } + else { + VALUE obj, *p, *pend; + + rb_scan_args(argc, argv, "1", &obj); + if (rb_block_given_p()) { + rb_warn("given block not used"); + } + for (p = RARRAY_PTR(ary), pend = p + RARRAY_LEN(ary); p < pend; p++) { + if (rb_equal(*p, obj)) n++; + } + } + + return LONG2NUM(n); +} + static VALUE flatten(VALUE ary, int level, int *modified) { @@ -3461,6 +3504,7 @@ Init_Array(void) rb_define_method(rb_cArray, "flatten", rb_ary_flatten, -1); rb_define_method(rb_cArray, "flatten!", rb_ary_flatten_bang, -1); rb_define_method(rb_cArray, "nitems", rb_ary_nitems, 0); + rb_define_method(rb_cArray, "count", rb_ary_count, -1); rb_define_method(rb_cArray, "shuffle!", rb_ary_shuffle_bang, 0); rb_define_method(rb_cArray, "shuffle", rb_ary_shuffle, 0); rb_define_method(rb_cArray, "choice", rb_ary_choice, 0); |