Bug #7877 » 0001-enumerator.c-Enumerator-Lazy-with_index.patch
| enumerator.c | ||
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return rb_attr_get(self, id_result);
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}
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static VALUE
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lazy_with_index_func(VALUE val, VALUE m, int argc, VALUE *argv)
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{
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VALUE e = rb_enum_values_pack(argc - 1, argv + 1);
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long idx = ((NODE*)m)->nd_cnt++;
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VALUE result = rb_assoc_new(e, INT2NUM(idx));
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rb_funcall2(argv[0], id_yield, 1, &result);
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return Qnil;
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}
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static VALUE
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lazy_with_index_iter(VALUE val, VALUE m, int argc, VALUE *argv)
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{
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VALUE e = rb_enum_values_pack(argc - 1, argv + 1);
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long idx = ((NODE*)m)->nd_cnt++;
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VALUE result = rb_assoc_new(e, INT2NUM(idx));
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result = rb_yield(result);
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rb_funcall2(argv[0], id_yield, 1, &result);
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return Qnil;
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}
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/*
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* call-seq:
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* lazy.with_index(offset = 0) {|(*args), idx| ... }
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* lazy.with_index(offset = 0)
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*
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* Iterates the given block for each element with an index, which
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* starts from +offset+. If no block is given, returns a new
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* lazy enumerator that includes the index, starting from +offset+
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*
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* +offset+:: the starting index to use
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*
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* see Enumerator#with_index.
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*/
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static VALUE
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lazy_with_index(int argc, VALUE *argv, VALUE obj)
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{
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SIGNED_VALUE offset;
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VALUE memo;
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rb_scan_args(argc, argv, "01", &memo);
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RETURN_SIZED_ENUMERATOR(obj, argc, argv, enumerator_size);
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offset = NIL_P(memo) ? 0 : (VALUE)NUM2LONG(memo);
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memo = (VALUE)NEW_MEMO(0, 0, offset);
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return lazy_set_method(rb_block_call(rb_cLazy, id_new, 1, &obj,
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rb_block_given_p() ?
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lazy_with_index_iter : lazy_with_index_func,
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memo),
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rb_ary_new3(argc, argv), 0);
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}
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void
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InitVM_Enumerator(void)
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{
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| ... | ... | |
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rb_define_method(rb_cLazy, "lazy", lazy_lazy, 0);
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rb_define_method(rb_cLazy, "chunk", lazy_super, -1);
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rb_define_method(rb_cLazy, "slice_before", lazy_super, -1);
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rb_define_method(rb_cLazy, "with_index", lazy_with_index, -1);
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rb_define_alias(rb_cLazy, "force", "to_a");
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| test/ruby/test_lazy_enumerator.rb | ||
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end
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assert_equal Enumerator::Lazy, [].lazy.chunk{}.class, bug7507
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end
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def test_with_index
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feature7877 = '[ruby-dev:47025] [Feature #7877]'
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leibniz = ->(n) {
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(0..Float::INFINITY).lazy.with_index {|i, j|
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raise IndexError, "limit exceeded (#{n})" unless j < n
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((-1) ** j) / (2*i+1).to_f
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}.take(n).reduce(:+)
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}
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assert_nothing_raised(IndexError, feature7877) {
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assert_in_epsilon(Math::PI/4, leibniz[1000])
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}
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end
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end
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