variant: Remove variant<T&>...
* include/std/variant: Remove variant<T&>, variant<void>, variant<> support to rebase on the post-Issaquah design. * testsuite/20_util/variant/compile.cc: Likewise. From-SVN: r242437
This commit is contained in:
Tim Shen
Tim Shen
parent
18d2ada84b
commit
7b277e8b46
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@ -1,3 +1,9 @@
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2016-11-15 Tim Shen <timshen@google.com>
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* include/std/variant: Remove variant<T&>, variant<void>, variant<> support
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to rebase on the post-Issaquah design.
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* testsuite/20_util/variant/compile.cc: Likewise.
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2016-11-15 Matthias Klose <doko@ubuntu.com>
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* configure: Regenerate.
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@ -341,9 +347,9 @@
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2016-11-09 Tim Shen <timshen@google.com>
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* libstdc++-v3/include/bits/regex.h (regex_iterator::regex_iterator()):
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* include/bits/regex.h (regex_iterator::regex_iterator()):
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Define end() as _M_pregex == nullptr.
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* libstdc++-v3/include/bits/regex.tcc (regex_iterator::operator==(),
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* include/bits/regex.tcc (regex_iterator::operator==(),
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regex_iterator::operator++()): Fix operator==() and operator++() to
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look at null-ness of _M_pregex on both sides.
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* testsuite/28_regex/regression.cc: New testcase.
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@ -137,41 +137,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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struct __reserved_type_map_impl<const volatile _From, _To>
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{ using type = add_cv_t<__reserved_type_map<_From, _To>>; };
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// Stores a reference alternative as a... well, reference.
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template<typename _Reference>
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struct _Reference_storage
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{
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static_assert(is_reference_v<_Reference>,
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"BUG: _Reference should be a reference");
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_Reference_storage(_Reference __ref) noexcept : _M_storage(__ref) { }
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operator _Reference() noexcept
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{ return static_cast<_Reference>(_M_storage); }
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_Reference _M_storage;
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};
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// Stores a void alternative, because it is not a regular type.
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template<typename _Void>
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struct _Void_storage { };
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// Map from the alternative type to a non-qualified storage type.
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template<typename _Alternative, typename = void>
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struct __storage_type
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{ using type = _Alternative; };
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// This abstraction might be useful for future features,
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// e.g. boost::recursive_wrapper.
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template<typename _Alternative>
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struct __storage_type<_Alternative,
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enable_if_t<is_reference_v<_Alternative>>>
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{ using type = _Reference_storage<_Alternative>; };
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template<typename _Alternative>
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struct __storage_type<_Alternative, enable_if_t<is_void_v<_Alternative>>>
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{ using type = _Void_storage<_Alternative>; };
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template<typename _Type>
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using __storage = typename __storage_type<_Type>::type;
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using __storage = _Alternative;
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template<typename _Type, bool __is_literal = std::is_literal_type_v<_Type>>
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struct _Uninitialized;
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@ -202,37 +171,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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_M_storage;
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};
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// Reverse mapping of __storage_type.
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template<typename _Storage_type>
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struct __alternative_type
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{
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static_assert(!is_reference_v<_Storage_type>,
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"BUG: _Storage_type should not be reference");
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using type = _Storage_type;
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};
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template<typename _Reference>
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struct __alternative_type<_Reference_storage<_Reference>>
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{ using type = _Reference; };
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template<typename _Void>
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struct __alternative_type<_Void_storage<_Void>>
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{ using type = _Void; };
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// Given a qualified storage type, return the desired reference.
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// The qualified storage type is supposed to carry the variant object's
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// qualifications and reference information, and the designated alternative's
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// storage type.
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// Returns the qualification-collapsed alternative references.
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//
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// For example, __get_alternative<_Reference_storage<int&&>&> returns int&.
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// For example, variant<int>&& stores the int as __storage<int>, and
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// _Qualified_storage will be __storage<int>&&.
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template<typename _Qualified_storage>
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decltype(auto)
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__get_alternative(void* __ptr)
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{
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using _Storage = decay_t<_Qualified_storage>;
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using _Alternative = typename __alternative_type<_Storage>::type;
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return __reserved_type_map<_Qualified_storage, _Alternative>(
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return __reserved_type_map<_Qualified_storage, _Storage>(
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*static_cast<_Storage*>(__ptr));
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}
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@ -970,6 +917,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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variant<_Types...>>
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{
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private:
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static_assert(sizeof...(_Types) > 0,
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"variant must have at least one alternative");
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static_assert(!(std::is_reference_v<_Types> || ...),
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"variant must have no reference alternative");
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static_assert(!(std::is_void_v<_Types> || ...),
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"variant must have no void alternative");
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using _Base = __detail::__variant::_Variant_base<_Types...>;
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using _Default_ctor_enabler =
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_Enable_default_constructor<
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@ -1265,11 +1219,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
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__get_storage(_Vp&& __v);
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};
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// To honor algebraic data type, variant<> should be a bottom type, which
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// is 0 (as opposed to a void type, which is 1). Use incomplete type to model
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// bottom type.
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template<> class variant<>;
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template<size_t _Np, typename... _Types>
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variant_alternative_t<_Np, variant<_Types...>>&
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get(variant<_Types...>& __v)
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@ -55,7 +55,6 @@ void default_ctor()
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{
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static_assert(is_default_constructible_v<variant<int, string>>, "");
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static_assert(is_default_constructible_v<variant<string, string>>, "");
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static_assert(!is_default_constructible_v<variant<>>, "");
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static_assert(!is_default_constructible_v<variant<AllDeleted, string>>, "");
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static_assert(is_default_constructible_v<variant<string, AllDeleted>>, "");
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@ -123,14 +122,6 @@ void uses_alloc_ctors()
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std::allocator<char> alloc;
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variant<int> a(allocator_arg, alloc);
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static_assert(!is_constructible_v<variant<AllDeleted>, allocator_arg_t, std::allocator<char>>, "");
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{
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variant<int> b(allocator_arg, alloc, a);
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static_assert(!is_constructible_v<variant<void>, allocator_arg_t, std::allocator<char>, const variant<void>&>, "");
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}
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{
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variant<int> b(allocator_arg, alloc, std::move(a));
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static_assert(!is_constructible_v<variant<void>, allocator_arg_t, std::allocator<char>, variant<void>&&>, "");
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}
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{
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variant<string, int> b(allocator_arg, alloc, "a");
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static_assert(!is_constructible_v<variant<string, string>, allocator_arg_t, std::allocator<char>, const char*>, "");
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@ -169,12 +160,6 @@ void copy_assign()
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variant<DefaultNoexcept> a;
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static_assert(!noexcept(a = a), "");
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}
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{
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float f1 = 1.0f, f2 = 2.0f;
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std::variant<float&> v1(f1);
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v1 = f2;
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}
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}
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void move_assign()
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@ -203,103 +188,13 @@ void arbitrary_assign()
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void test_get()
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{
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{
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static_assert(is_same<decltype(get<0>(variant<int, string>())), int&&>::value, "");
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static_assert(is_same<decltype(get<1>(variant<int, string>())), string&&>::value, "");
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static_assert(is_same<decltype(get<1>(variant<int, string&>())), string&>::value, "");
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static_assert(is_same<decltype(get<1>(variant<int, string&&>())), string&&>::value, "");
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static_assert(is_same<decltype(get<1>(variant<int, const string>())), const string&&>::value, "");
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static_assert(is_same<decltype(get<1>(variant<int, const string&>())), const string&>::value, "");
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static_assert(is_same<decltype(get<1>(variant<int, const string&&>())), const string&&>::value, "");
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static_assert(is_same<decltype(get<0>(variant<int, string>())), int&&>::value, "");
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static_assert(is_same<decltype(get<1>(variant<int, string>())), string&&>::value, "");
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static_assert(is_same<decltype(get<1>(variant<int, const string>())), const string&&>::value, "");
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static_assert(is_same<decltype(get<int>(variant<int, string>())), int&&>::value, "");
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static_assert(is_same<decltype(get<string>(variant<int, string>())), string&&>::value, "");
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static_assert(is_same<decltype(get<string&>(variant<int, string&>())), string&>::value, "");
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static_assert(is_same<decltype(get<string&&>(variant<int, string&&>())), string&&>::value, "");
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static_assert(is_same<decltype(get<const string>(variant<int, const string>())), const string&&>::value, "");
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static_assert(is_same<decltype(get<const string&>(variant<int, const string&>())), const string&>::value, "");
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static_assert(is_same<decltype(get<const string&&>(variant<int, const string&&>())), const string&&>::value, "");
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}
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{
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variant<int, string> a;
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variant<int, string&> b;
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variant<int, string&&> c;
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variant<int, const string> d;
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variant<int, const string&> e;
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variant<int, const string&&> f;
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static_assert(is_same<decltype(get<0>(a)), int&>::value, "");
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static_assert(is_same<decltype(get<1>(a)), string&>::value, "");
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static_assert(is_same<decltype(get<1>(b)), string&>::value, "");
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static_assert(is_same<decltype(get<1>(c)), string&>::value, "");
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static_assert(is_same<decltype(get<1>(e)), const string&>::value, "");
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static_assert(is_same<decltype(get<1>(e)), const string&>::value, "");
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static_assert(is_same<decltype(get<1>(f)), const string&>::value, "");
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static_assert(is_same<decltype(get<int>(a)), int&>::value, "");
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static_assert(is_same<decltype(get<string>(a)), string&>::value, "");
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static_assert(is_same<decltype(get<string&>(b)), string&>::value, "");
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static_assert(is_same<decltype(get<string&&>(c)), string&>::value, "");
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static_assert(is_same<decltype(get<const string>(e)), const string&>::value, "");
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static_assert(is_same<decltype(get<const string&>(e)), const string&>::value, "");
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static_assert(is_same<decltype(get<const string&&>(f)), const string&>::value, "");
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static_assert(is_same<decltype(get_if<0>(&a)), int*>::value, "");
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static_assert(is_same<decltype(get_if<1>(&a)), string*>::value, "");
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static_assert(is_same<decltype(get_if<1>(&b)), string*>::value, "");
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static_assert(is_same<decltype(get_if<1>(&c)), string*>::value, "");
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static_assert(is_same<decltype(get_if<1>(&e)), const string*>::value, "");
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static_assert(is_same<decltype(get_if<1>(&e)), const string*>::value, "");
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static_assert(is_same<decltype(get_if<1>(&f)), const string*>::value, "");
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static_assert(is_same<decltype(get_if<int>(&a)), int*>::value, "");
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static_assert(is_same<decltype(get_if<string>(&a)), string*>::value, "");
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static_assert(is_same<decltype(get_if<string&>(&b)), string*>::value, "");
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static_assert(is_same<decltype(get_if<string&&>(&c)), string*>::value, "");
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static_assert(is_same<decltype(get_if<const string>(&e)), const string*>::value, "");
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static_assert(is_same<decltype(get_if<const string&>(&e)), const string*>::value, "");
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static_assert(is_same<decltype(get_if<const string&&>(&f)), const string*>::value, "");
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}
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{
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const variant<int, string> a;
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const variant<int, string&> b;
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const variant<int, string&&> c;
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const variant<int, const string> d;
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const variant<int, const string&> e;
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const variant<int, const string&&> f;
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static_assert(is_same<decltype(get<0>(a)), const int&>::value, "");
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static_assert(is_same<decltype(get<1>(a)), const string&>::value, "");
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static_assert(is_same<decltype(get<1>(b)), string&>::value, "");
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static_assert(is_same<decltype(get<1>(c)), string&>::value, "");
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static_assert(is_same<decltype(get<1>(d)), const string&>::value, "");
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static_assert(is_same<decltype(get<1>(e)), const string&>::value, "");
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static_assert(is_same<decltype(get<1>(f)), const string&>::value, "");
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static_assert(is_same<decltype(get<int>(a)), const int&>::value, "");
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static_assert(is_same<decltype(get<string>(a)), const string&>::value, "");
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static_assert(is_same<decltype(get<string&>(b)), string&>::value, "");
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static_assert(is_same<decltype(get<string&&>(c)), string&>::value, "");
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static_assert(is_same<decltype(get<const string>(d)), const string&>::value, "");
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static_assert(is_same<decltype(get<const string&>(e)), const string&>::value, "");
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static_assert(is_same<decltype(get<const string&&>(f)), const string&>::value, "");
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static_assert(is_same<decltype(get_if<0>(&a)), const int*>::value, "");
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static_assert(is_same<decltype(get_if<1>(&a)), const string*>::value, "");
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static_assert(is_same<decltype(get_if<1>(&b)), string*>::value, "");
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static_assert(is_same<decltype(get_if<1>(&c)), string*>::value, "");
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static_assert(is_same<decltype(get_if<1>(&d)), const string*>::value, "");
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static_assert(is_same<decltype(get_if<1>(&e)), const string*>::value, "");
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static_assert(is_same<decltype(get_if<1>(&f)), const string*>::value, "");
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static_assert(is_same<decltype(get_if<int>(&a)), const int*>::value, "");
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static_assert(is_same<decltype(get_if<string>(&a)), const string*>::value, "");
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static_assert(is_same<decltype(get_if<string&>(&b)), string*>::value, "");
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static_assert(is_same<decltype(get_if<string&&>(&c)), string*>::value, "");
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static_assert(is_same<decltype(get_if<const string>(&d)), const string*>::value, "");
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static_assert(is_same<decltype(get_if<const string&>(&e)), const string*>::value, "");
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static_assert(is_same<decltype(get_if<const string&&>(&f)), const string*>::value, "");
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}
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static_assert(is_same<decltype(get<int>(variant<int, string>())), int&&>::value, "");
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static_assert(is_same<decltype(get<string>(variant<int, string>())), string&&>::value, "");
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static_assert(is_same<decltype(get<const string>(variant<int, const string>())), const string&&>::value, "");
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}
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void test_relational()
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@ -344,16 +239,6 @@ void test_visit()
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void operator()(monostate) const {}
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void operator()(const int&) const {}
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};
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variant<monostate, int&, const int&, int&&, const int&&> a;
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const variant<monostate, int&, const int&, int&&, const int&&> b;
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Visitor v;
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const CVisitor u;
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static_assert(is_same<void, decltype(visit(Visitor(), a))>::value, "");
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static_assert(is_same<void, decltype(visit(Visitor(), b))>::value, "");
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static_assert(is_same<void, decltype(visit(v, a))>::value, "");
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static_assert(is_same<void, decltype(visit(v, b))>::value, "");
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static_assert(is_same<void, decltype(visit(u, a))>::value, "");
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static_assert(is_same<void, decltype(visit(u, b))>::value, "");
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}
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{
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struct Visitor
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@ -397,19 +282,6 @@ void test_constexpr()
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}
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}
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void test_void()
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{
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static_assert(is_same<int&&, decltype(get<int>(variant<int, void>()))>::value, "");
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static_assert(!is_default_constructible_v<variant<void, int>>, "");
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static_assert(!is_copy_constructible_v<variant<int, void>>, "");
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static_assert(!is_move_constructible_v<variant<int, void>>, "");
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static_assert(!is_copy_assignable_v<variant<int, void>>, "");
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static_assert(!is_move_assignable_v<variant<int, void>>, "");
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variant<int, void, string> v;
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v = 3;
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v = "asdf";
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}
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void test_pr77641()
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{
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struct X {
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@ -457,11 +329,4 @@ void test_adl()
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variant<X> v7{allocator_arg, a, in_place_index<0>, il, x};
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variant<X> v8{allocator_arg, a, in_place_type<X>, il, x};
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variant<X> v9{allocator_arg, a, in_place_type<X>, 1};
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std::variant<X&> vr0(x);
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vr0 = x;
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variant<X&> vr1{in_place_index<0>, x};
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variant<X&> vr2{in_place_type<X&>, x};
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variant<X&> vr3{allocator_arg, a, in_place_index<0>, x};
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variant<X&> vr4{allocator_arg, a, in_place_type<X&>, x};
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}
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