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
82 lines
2.2 KiB
C++
82 lines
2.2 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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// constexpr optional() noexcept;
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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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template <class Opt>
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void
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test_constexpr()
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{
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static_assert(std::is_nothrow_default_constructible<Opt>::value, "");
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static_assert(std::is_trivially_destructible<Opt>::value, "");
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static_assert(std::is_trivially_destructible<typename Opt::value_type>::value, "");
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constexpr Opt opt;
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static_assert(static_cast<bool>(opt) == false, "");
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struct test_constexpr_ctor
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: public Opt
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{
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constexpr test_constexpr_ctor() {}
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};
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}
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template <class Opt>
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void
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test()
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{
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static_assert(std::is_nothrow_default_constructible<Opt>::value, "");
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static_assert(!std::is_trivially_destructible<Opt>::value, "");
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static_assert(!std::is_trivially_destructible<typename Opt::value_type>::value, "");
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{
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Opt opt;
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assert(static_cast<bool>(opt) == false);
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}
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{
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const Opt opt;
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assert(static_cast<bool>(opt) == false);
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}
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struct test_constexpr_ctor
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: public Opt
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{
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constexpr test_constexpr_ctor() {}
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};
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}
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int main()
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{
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test_constexpr<optional<int>>();
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test_constexpr<optional<int*>>();
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test_constexpr<optional<ImplicitTypes::NoCtors>>();
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test_constexpr<optional<NonTrivialTypes::NoCtors>>();
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test_constexpr<optional<NonConstexprTypes::NoCtors>>();
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test<optional<NonLiteralTypes::NoCtors>>();
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// EXTENSIONS
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#if defined(_LIBCPP_VERSION) && 0 // FIXME these extensions are currently disabled.
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test_constexpr<optional<int&>>();
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test_constexpr<optional<const int&>>();
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test_constexpr<optional<int&>>();
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test_constexpr<optional<NonLiteralTypes::NoCtors&>>();
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test_constexpr<optional<NonLiteralTypes::NoCtors&&>>();
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#endif
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}
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