diff options
Diffstat (limited to 'enum.c')
-rw-r--r-- | enum.c | 25 |
1 files changed, 25 insertions, 0 deletions
@@ -3699,6 +3699,8 @@ static VALUE enum_sum(int argc, VALUE* argv, VALUE obj) { struct enum_sum_memo memo; + VALUE beg, end; + int excl; if (rb_scan_args(argc, argv, "01", &memo.v) == 0) memo.v = LONG2FIX(0); @@ -3713,6 +3715,29 @@ enum_sum(int argc, VALUE* argv, VALUE obj) memo.c = 0.0; } + if (RTEST(rb_range_values(obj, &beg, &end, &excl))) { + if (!memo.block_given && !memo.float_value && + (FIXNUM_P(beg) || RB_TYPE_P(beg, T_BIGNUM)) && + (FIXNUM_P(end) || RB_TYPE_P(end, T_BIGNUM))) { + if (excl) { + if (FIXNUM_P(end)) + end = LONG2FIX(FIX2LONG(end) - 1); + else + end = rb_big_minus(end, LONG2FIX(1)); + } + if (rb_int_ge(end, beg)) { + VALUE a; + a = rb_int_plus(rb_int_minus(end, beg), LONG2FIX(1)); + a = rb_int_mul(a, rb_int_plus(end, beg)); + a = rb_int_idiv(a, LONG2FIX(2)); + return rb_int_plus(memo.v, a); + } + else { + return memo.v; + } + } + } + rb_block_call(obj, id_each, 0, 0, enum_sum_iter_i, (VALUE)&memo); if (memo.float_value) { |