f97936fabd
Too many warnings are being disabled too quickly. Warnings are important to keeping libc++ correct. This patch re-enables two warnings: -Wconstant-evaluated and -Wdeprecated-copy. In future, all warnings disabled for the test suite should require an attached bug. The bug should state the plan for re-enabling that warning, or a strong case why it should remain disabled.
109 lines
2.5 KiB
C++
109 lines
2.5 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++98, c++03, c++11, c++14
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// <optional>
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// optional<T>& operator=(const optional<T>& rhs); // constexpr in C++20
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#include <optional>
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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#include "archetypes.h"
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using std::optional;
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struct X
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{
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static bool throw_now;
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X() = default;
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X(const X&)
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{
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if (throw_now)
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TEST_THROW(6);
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}
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X& operator=(X const&) = default;
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};
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bool X::throw_now = false;
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template <class Tp>
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constexpr bool assign_empty(optional<Tp>&& lhs) {
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const optional<Tp> rhs;
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lhs = rhs;
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return !lhs.has_value() && !rhs.has_value();
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}
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template <class Tp>
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constexpr bool assign_value(optional<Tp>&& lhs) {
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const optional<Tp> rhs(101);
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lhs = rhs;
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return lhs.has_value() && rhs.has_value() && *lhs == *rhs;
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}
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int main(int, char**)
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{
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{
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using O = optional<int>;
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#if TEST_STD_VER > 17
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LIBCPP_STATIC_ASSERT(assign_empty(O{42}), "");
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LIBCPP_STATIC_ASSERT(assign_value(O{42}), "");
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#endif
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assert(assign_empty(O{42}));
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assert(assign_value(O{42}));
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}
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{
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using O = optional<TrivialTestTypes::TestType>;
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#if TEST_STD_VER > 17
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LIBCPP_STATIC_ASSERT(assign_empty(O{42}), "");
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LIBCPP_STATIC_ASSERT(assign_value(O{42}), "");
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#endif
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assert(assign_empty(O{42}));
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assert(assign_value(O{42}));
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}
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{
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using O = optional<TestTypes::TestType>;
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assert(assign_empty(O{42}));
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assert(assign_value(O{42}));
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}
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{
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using T = TestTypes::TestType;
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T::reset();
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optional<T> opt(3);
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const optional<T> opt2;
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assert(T::alive == 1);
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opt = opt2;
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assert(T::alive == 0);
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assert(!opt2.has_value());
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assert(!opt.has_value());
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}
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#ifndef TEST_HAS_NO_EXCEPTIONS
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{
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optional<X> opt;
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optional<X> opt2(X{});
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assert(static_cast<bool>(opt2) == true);
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try
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{
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X::throw_now = true;
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opt = opt2;
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assert(false);
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}
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catch (int i)
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{
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assert(i == 6);
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assert(static_cast<bool>(opt) == false);
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}
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}
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#endif
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return 0;
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}
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