54 lines
1.7 KiB
C++
54 lines
1.7 KiB
C++
// RUN: %clang_cc1 -std=c++2c -fexperimental-new-constant-interpreter -verify=expected,both %s
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// RUN: %clang_cc1 -std=c++2c -verify=ref,both %s
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// both-no-diagnostics
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namespace std {
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template <class, int __v> struct integral_constant {
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static const int value = __v;
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};
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using size_t = decltype(sizeof(int));
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template <class _Tp, class>
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concept __weakly_equality_comparable_with = requires(_Tp __t) { __t; };
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template <size_t, class> struct tuple_element;
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template <class> struct tuple_size;
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template <class _Ip>
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concept input_or_output_iterator = requires(_Ip __i) { __i; };
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template <class _Sp, class _Ip>
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concept sentinel_for = __weakly_equality_comparable_with<_Sp, _Ip>;
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namespace ranges {
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enum subrange_kind { unsized };
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template <input_or_output_iterator _Iter, sentinel_for<_Iter> _Sent,
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subrange_kind = unsized>
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struct subrange {
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_Iter __begin_;
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_Sent __end_;
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constexpr _Sent end() { return __end_; }
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};
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template <int, class _Iter, class _Sent, subrange_kind _Kind>
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constexpr auto get(subrange<_Iter, _Sent, _Kind> __subrange) {
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return __subrange.end();
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}
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} // namespace ranges
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template <class _Ip, class _Sp, ranges::subrange_kind _Kp>
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struct tuple_size<ranges::subrange<_Ip, _Sp, _Kp>>
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: integral_constant<size_t, 2> {};
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template <class _Ip, class _Sp, ranges::subrange_kind _Kp>
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struct tuple_element<0, ranges::subrange<_Ip, _Sp, _Kp>> {
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using type = _Ip;
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};
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template <class _Ip, class _Sp, ranges::subrange_kind _Kp>
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struct tuple_element<1, ranges::subrange<_Ip, _Sp, _Kp>> {
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using type = _Sp;
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};
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} // namespace std
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constexpr bool test() {
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int a[1];
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auto r = std::ranges::subrange(a, a);
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auto [first, last] = r;
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last = a;
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return true;
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}
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static_assert(test());
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