a9e659619f
Summary: Adapt implementation of Library Fundamentals TS optional into an implementation of N4606 optional. - Update relational operators per http://wg21.link/P0307 - Update to requirements of http://wg21.link/P0032 - Extension: Implement trivial copy/move construction/assignment for `optional<T>` when `T` is trivially copyable. Audit P/Rs for optional LWG issues: - 2756 "C++ WP optional<T> should 'forward' T's implicit conversions" Implemented, which also resolves 2753 "Optional's constructors and assignments need constraints" (modulo my refusal to explicitly delete the move operations, which is a design error that I'm working on correcting in the 2756 P/R). - 2736 "nullopt_t insufficiently constrained" Already conforming. I've added a test ensuring that `nullopt_t` is not copy-initializable from an empty braced-init-list, which I believe is the root intent of the issue, to avoid regression. - 2740 "constexpr optional<T>::operator->" Already conforming. - 2746 "Inconsistency between requirements for emplace between optional and variant" No P/R, but note that the author's '"suggested resolution" is already implemented. - 2748 "swappable traits for optionals" Already conforming. - 2753 "Optional's constructors and assignments need constraints" Implemented. Most of the work for this patch was done by Casey Carter @ Microsoft. Thank you Casey! Reviewers: mclow.lists, CaseyCarter, EricWF Differential Revision: https://reviews.llvm.org/D22741 llvm-svn: 283980
103 lines
2.4 KiB
C++
103 lines
2.4 KiB
C++
//===----------------------------------------------------------------------===//
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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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// <optional>
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// optional<T>& operator=(const optional<T>& rhs);
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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.hpp"
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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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};
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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()
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{
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{
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using O = optional<int>;
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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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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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LIBCPP_STATIC_ASSERT(assign_empty(O{42}), "");
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LIBCPP_STATIC_ASSERT(assign_value(O{42}), "");
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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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}
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