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f8f62ac93c
Summary: Prefer user-defined conversions over narrowing conversions and conversions to bool. References: http://wg21.link/p0608 Reviewers: EricWF, mpark, mclow.lists Reviewed By: mclow.lists Subscribers: zoecarver, ldionne, libcxx-commits, cfe-commits, christof Differential Revision: https://reviews.llvm.org/D44865 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@363692 91177308-0d34-0410-b5e6-96231b3b80d8
40 lines
1.6 KiB
C++
40 lines
1.6 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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++98, c++03, c++11, c++14
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// <variant>
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// template <class ...Types> class variant;
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// template <class T> constexpr variant(T&&) noexcept(see below);
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#include <variant>
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#include <string>
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#include <memory>
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int main(int, char**)
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{
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std::variant<int, int> v1 = 1; // expected-error {{no viable conversion}}
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std::variant<long, long long> v2 = 1; // expected-error {{no viable conversion}}
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std::variant<char> v3 = 1; // expected-error {{no viable conversion}}
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std::variant<std::string, float> v4 = 1; // expected-error {{no viable conversion}}
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std::variant<std::string, double> v5 = 1; // expected-error {{no viable conversion}}
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std::variant<std::string, bool> v6 = 1; // expected-error {{no viable conversion}}
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std::variant<int, bool> v7 = "meow"; // expected-error {{no viable conversion}}
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std::variant<int, bool const> v8 = "meow"; // expected-error {{no viable conversion}}
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std::variant<int, bool volatile> v9 = "meow"; // expected-error {{no viable conversion}}
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std::variant<bool> v10 = std::true_type(); // expected-error {{no viable conversion}}
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std::variant<bool> v11 = std::unique_ptr<char>(); // expected-error {{no viable conversion}}
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std::variant<bool> v12 = nullptr; // expected-error {{no viable conversion}}
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}
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