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989927cc37
type. Libc++ correctly asserts that a set of visitors for a variant all return the same type. However, we use the visitation machinary to perform relational operations. This causes a static assertion when some of the alternatives relops return a UDT which is implicitly convertible to bool instead of 'bool' exactly. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@342560 91177308-0d34-0410-b5e6-96231b3b80d8
89 lines
3.1 KiB
C++
89 lines
3.1 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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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>
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// constexpr bool
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// operator==(variant<Types...> const&, variant<Types...> const&) noexcept;
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//
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// template <class ...Types>
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// constexpr bool
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// operator!=(variant<Types...> const&, variant<Types...> const&) noexcept;
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//
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// template <class ...Types>
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// constexpr bool
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// operator<(variant<Types...> const&, variant<Types...> const&) noexcept;
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//
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// template <class ...Types>
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// constexpr bool
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// operator>(variant<Types...> const&, variant<Types...> const&) noexcept;
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//
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// template <class ...Types>
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// constexpr bool
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// operator<=(variant<Types...> const&, variant<Types...> const&) noexcept;
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//
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// template <class ...Types>
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// constexpr bool
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// operator>=(variant<Types...> const&, variant<Types...> const&) noexcept;
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#include <cassert>
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#include <type_traits>
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#include <utility>
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#include <variant>
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#include "test_macros.h"
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struct MyBoolExplicit {
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bool value;
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constexpr explicit MyBoolExplicit(bool v) : value(v) {}
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constexpr explicit operator bool() const noexcept { return value; }
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};
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struct ComparesToMyBoolExplicit {
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int value = 0;
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};
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inline constexpr MyBoolExplicit operator==(const ComparesToMyBoolExplicit& LHS, const ComparesToMyBoolExplicit& RHS) noexcept {
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return MyBoolExplicit(LHS.value == RHS.value);
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}
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inline constexpr MyBoolExplicit operator!=(const ComparesToMyBoolExplicit& LHS, const ComparesToMyBoolExplicit& RHS) noexcept {
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return MyBoolExplicit(LHS.value != RHS.value);
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}
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inline constexpr MyBoolExplicit operator<(const ComparesToMyBoolExplicit& LHS, const ComparesToMyBoolExplicit& RHS) noexcept {
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return MyBoolExplicit(LHS.value < RHS.value);
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}
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inline constexpr MyBoolExplicit operator<=(const ComparesToMyBoolExplicit& LHS, const ComparesToMyBoolExplicit& RHS) noexcept {
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return MyBoolExplicit(LHS.value <= RHS.value);
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}
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inline constexpr MyBoolExplicit operator>(const ComparesToMyBoolExplicit& LHS, const ComparesToMyBoolExplicit& RHS) noexcept {
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return MyBoolExplicit(LHS.value > RHS.value);
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}
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inline constexpr MyBoolExplicit operator>=(const ComparesToMyBoolExplicit& LHS, const ComparesToMyBoolExplicit& RHS) noexcept {
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return MyBoolExplicit(LHS.value >= RHS.value);
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}
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int main() {
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using V = std::variant<int, ComparesToMyBoolExplicit>;
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V v1(42);
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V v2(101);
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// expected-error-re@variant:* 6 {{static_assert failed due to requirement 'std::is_convertible{{[^']+}}' "the relational operator does not return a type which is implicitly convertible to bool"}}
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// expected-error@variant:* 6 {{no viable conversion}}
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(void)(v1 == v2); // expected-note {{here}}
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(void)(v1 != v2); // expected-note {{here}}
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(void)(v1 < v2); // expected-note {{here}}
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(void)(v1 <= v2); // expected-note {{here}}
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(void)(v1 > v2); // expected-note {{here}}
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(void)(v1 >= v2); // expected-note {{here}}
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}
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