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1 // PR c++/69009
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2 // { dg-do compile { target c++14 } }
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3
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4 using _uchar = char;
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5 using _size_t = decltype(sizeof(_uchar));
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6 using size_t = _size_t;
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7 template <class T, T> struct integral_constant;
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8 template <bool b> using bool_constant = integral_constant<bool, b>;
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9 template <class> constexpr auto tuple_size_v = 0;
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10 template <class T> auto const tuple_size_v<T const volatile> = tuple_size_v<T>;
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11 template <class T>
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12 using tuple_size = integral_constant<size_t, tuple_size_v<T>>;
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13 template <typename Base, typename Deriv>
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14 using is_base_of = bool_constant<__is_base_of(Base, Deriv)>;
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15 template <class T, size_t N> void test() {
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16 is_base_of<integral_constant<size_t, N>, tuple_size<T>> value(
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17 is_base_of<integral_constant<size_t, N>, tuple_size<const volatile T>>);
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18 }
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19 void foo() { test<int, 0>; }
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