44 lines
1.4 KiB
C++
44 lines
1.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
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// <flat_set>
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// Test CTAD on cases where deduction should fail.
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#include <flat_set>
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#include <functional>
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#include <memory>
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#include <utility>
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#include <vector>
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struct NotAnAllocator {
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friend bool operator<(NotAnAllocator, NotAnAllocator) { return false; }
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};
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template <class... Args>
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concept CanDeductFlatMultiSet = requires { std::flat_multiset(std::declval<Args>()...); };
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static_assert(CanDeductFlatMultiSet<std::vector<int>>);
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// cannot deduce Key and T from nothing
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static_assert(!CanDeductFlatMultiSet<>);
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// cannot deduce Key and T from just (Compare)
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static_assert(!CanDeductFlatMultiSet<std::less<int>>);
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// cannot deduce Key and T from just (Compare, Allocator)
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static_assert(!CanDeductFlatMultiSet<std::less<int>, std::allocator<int>>);
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// cannot deduce Key and T from just (Allocator)
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static_assert(!CanDeductFlatMultiSet<std::allocator<int>>);
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// cannot convert from some arbitrary unrelated type
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static_assert(!CanDeductFlatMultiSet<NotAnAllocator>);
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