class method

Enumerator::Product.new

[unchecked out Elem] (*::_EachEntry[Elem]) -> ::Enumerator::Product[Elem]

Enumerator::Product.new(*enums) → enum

static VALUE
enum_product_initialize(int argc, VALUE *argv, VALUE obj)
{
    struct enum_product *ptr;
    VALUE enums = Qnil, options = Qnil;

    rb_scan_args(argc, argv, "*:", &enums, &options);

    if (!NIL_P(options) && !RHASH_EMPTY_P(options)) {
        rb_exc_raise(rb_keyword_error_new("unknown", rb_hash_keys(options)));
    }

    rb_check_frozen(obj);
    TypedData_Get_Struct(obj, struct enum_product, &enum_product_data_type, ptr);

    if (!ptr) rb_raise(rb_eArgError, "unallocated product");

    RB_OBJ_WRITE(obj, &ptr->enums, rb_ary_freeze(enums));

    return obj;
}

Generates a new enumerator object that generates a Cartesian product of given enumerable objects.

Example

e = Enumerator::Product.new(1..3, [4, 5])
e.to_a #=> [[1, 4], [1, 5], [2, 4], [2, 5], [3, 4], [3, 5]]
e.size #=> 6

See also #each #inspect also in 4.1 · 3.4 · 3.3 · 3.2

next ›#each