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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// UNSUPPORTED: libcpp-no-concepts
// UNSUPPORTED: libcpp-has-no-incomplete-ranges
// template<class R>
// explicit join_view(R&&) -> join_view<views::all_t<R>>;
// Tests that the deduction guide is explicit.
#include <ranges>
#include "test_iterators.h"
template<class T>
struct Range {
friend T* begin(Range&) { return nullptr; }
friend T* begin(Range const&) { return nullptr; }
friend sentinel_wrapper<T*> end(Range&) { return sentinel_wrapper<T*>(nullptr); }
friend sentinel_wrapper<T*> end(Range const&) { return sentinel_wrapper<T*>(nullptr); }
};
void testExplicitCTAD() {
Range<Range<int>> r;
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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