| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <tuple> |
| |
| // template <class... Types> class tuple; |
| |
| // template <class... Types> |
| // struct tuple_size<tuple<Types...>> |
| // : public integral_constant<size_t, sizeof...(Types)> { }; |
| |
| // UNSUPPORTED: c++98, c++03 |
| |
| #include <tuple> |
| #include <array> |
| #include <type_traits> |
| |
| struct Dummy1 {}; |
| struct Dummy2 {}; |
| struct Dummy3 {}; |
| |
| template <> |
| struct std::tuple_size<Dummy1> { |
| public: |
| static size_t value; |
| }; |
| |
| template <> |
| struct std::tuple_size<Dummy2> { |
| public: |
| static void value() {} |
| }; |
| |
| template <> |
| struct std::tuple_size<Dummy3> {}; |
| |
| int main(int, char**) |
| { |
| // Test that tuple_size<const T> is not incomplete when tuple_size<T>::value |
| // is well-formed but not a constant expression. |
| { |
| // expected-error@__tuple:* 1 {{is not a constant expression}} |
| (void)std::tuple_size<const Dummy1>::value; // expected-note {{here}} |
| } |
| // Test that tuple_size<const T> is not incomplete when tuple_size<T>::value |
| // is well-formed but not convertible to size_t. |
| { |
| // expected-error@__tuple:* 1 {{value of type 'void ()' is not implicitly convertible to}} |
| (void)std::tuple_size<const Dummy2>::value; // expected-note {{here}} |
| } |
| // Test that tuple_size<const T> generates an error when tuple_size<T> is |
| // complete but ::value isn't a constant expression convertible to size_t. |
| { |
| // expected-error@__tuple:* 1 {{no member named 'value'}} |
| (void)std::tuple_size<const Dummy3>::value; // expected-note {{here}} |
| } |
| |
| return 0; |
| } |