| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // UNSUPPORTED: c++03, c++11, c++14, c++17 |
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| 10 | |
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| 11 | // template<class R> |
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| 12 | // explicit join_view(R&&) -> join_view<views::all_t<R>>; |
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| 13 | |
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| 14 | // Tests that the deduction guide is explicit. |
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| 15 | |
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| 16 | #include <ranges> |
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| 17 | |
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| 18 | #include "test_iterators.h" |
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| 19 | |
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| 20 | template<class T> |
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| 21 | struct Range { |
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| 22 | friend T* begin(Range&) { return nullptr; } |
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| 23 | friend T* begin(Range const&) { return nullptr; } |
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| 24 | friend sentinel_wrapper<T*> end(Range&) { return sentinel_wrapper<T*>(nullptr); } |
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| 25 | friend sentinel_wrapper<T*> end(Range const&) { return sentinel_wrapper<T*>(nullptr); } |
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| 26 | }; |
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| 27 | |
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| 28 | void testExplicitCTAD() { |
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| 29 | Range<Range<int>> r; |
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| 30 | std::ranges::join_view v = r; // expected-error {{no viable constructor or deduction guide for deduction of template arguments of 'join_view'}} |
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| 31 | } |
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| 32 | |
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