K-ballo created this revision.
K-ballo added reviewers: mclow.lists, EricWF.
K-ballo added a subscriber: cfe-commits.
Implement LWG2485, `get()` should be overloaded for `const tuple&&`.
http://reviews.llvm.org/D14839
Files:
include/__tuple
include/array
include/tuple
include/utility
test/std/containers/sequences/array/array.tuple/get_const_rv.pass.cpp
test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const_rv.fail.cpp
test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const_rv.pass.cpp
test/std/utilities/tuple/tuple.tuple/tuple.elem/tuple.by.type.pass.cpp
test/std/utilities/utility/pairs/pair.astuple/get_const_rv.pass.cpp
test/std/utilities/utility/pairs/pair.astuple/pairs.by.type.pass.cpp
Index: test/std/utilities/utility/pairs/pair.astuple/pairs.by.type.pass.cpp
===================================================================
--- test/std/utilities/utility/pairs/pair.astuple/pairs.by.type.pass.cpp
+++ test/std/utilities/utility/pairs/pair.astuple/pairs.by.type.pass.cpp
@@ -40,5 +40,13 @@
assert(std::get<0>(t) == nullptr); // has been moved from
}
+ {
+ typedef std::unique_ptr<int> upint;
+ const std::pair<upint, int> t(upint(new int(4)), 42);
+ const upint&& p = std::get<0>(std::move(t)); // get const rvalue
+ assert(*p == 4);
+ assert(std::get<0>(t) != nullptr);
+ }
+
#endif
}
Index: test/std/utilities/utility/pairs/pair.astuple/get_const_rv.pass.cpp
===================================================================
--- /dev/null
+++ test/std/utilities/utility/pairs/pair.astuple/get_const_rv.pass.cpp
@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <utility>
+
+// template <class T1, class T2> struct pair
+
+// template<size_t I, class T1, class T2>
+// const typename tuple_element<I, std::pair<T1, T2> >::type&&
+// get(const pair<T1, T2>&&);
+
+#include <utility>
+#include <memory>
+#include <cassert>
+
+int main()
+{
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+ {
+ typedef std::pair<std::unique_ptr<int>, short> P;
+ const P p(std::unique_ptr<int>(new int(3)), 4);
+ const std::unique_ptr<int>&& ptr = std::get<0>(std::move(p));
+ assert(*ptr == 3);
+ }
+#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+}
Index: test/std/utilities/tuple/tuple.tuple/tuple.elem/tuple.by.type.pass.cpp
===================================================================
--- test/std/utilities/tuple/tuple.tuple/tuple.elem/tuple.by.type.pass.cpp
+++ test/std/utilities/tuple/tuple.tuple/tuple.elem/tuple.by.type.pass.cpp
@@ -56,5 +56,13 @@
assert(std::get<0>(t) == nullptr); // has been moved from
}
+ {
+ typedef std::unique_ptr<int> upint;
+ const std::tuple<upint> t(upint(new int(4)));
+ const upint&& p = std::get<upint>(std::move(t)); // get const rvalue
+ assert(*p == 4);
+ assert(std::get<0>(t) != nullptr);
+ }
+
#endif
}
Index: test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const_rv.pass.cpp
===================================================================
--- /dev/null
+++ test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const_rv.pass.cpp
@@ -0,0 +1,43 @@
+//===----------------------------------------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <tuple>
+
+// template <class... Types> class tuple;
+
+// template <size_t I, class... Types>
+// const typename tuple_element<I, tuple<Types...> >::type&&
+// get(const tuple<Types...>&& t);
+
+// UNSUPPORTED: c++98, c++03
+
+#include <tuple>
+#include <utility>
+#include <string>
+#include <cassert>
+
+struct Empty {};
+
+int main()
+{
+ {
+ typedef std::tuple<int> T;
+ const T t(3);
+ int const&& i = std::get<0>(std::move(t));
+ assert(i == 3);
+ }
+ {
+ typedef std::tuple<std::string, int> T;
+ const T t("high", 5);
+ std::string const&& s = std::get<0>(std::move(t));
+ int const&& i = std::get<1>(std::move(t));
+ assert(s == "high");
+ assert(i == 5);
+ }
+}
Index: test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const_rv.fail.cpp
===================================================================
--- /dev/null
+++ test/std/utilities/tuple/tuple.tuple/tuple.elem/get_const_rv.fail.cpp
@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <tuple>
+
+// template <class... Types> class tuple;
+
+// template <size_t I, class... Types>
+// const typename tuple_element<I, tuple<Types...> >::type&&
+// get(const tuple<Types...>&& t);
+
+// UNSUPPORTED: c++98, c++03
+
+#include <tuple>
+
+template <class T> void cref(T const&) {};
+template <class T> void cref(T const&&) = delete;
+
+std::tuple<int> const tup4() { return std::make_tuple(4); }
+
+int main()
+{
+ {
+ cref(std::get<0>(tup4()));
+ }
+}
Index: test/std/containers/sequences/array/array.tuple/get_const_rv.pass.cpp
===================================================================
--- /dev/null
+++ test/std/containers/sequences/array/array.tuple/get_const_rv.pass.cpp
@@ -0,0 +1,35 @@
+//===----------------------------------------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <array>
+
+// template <size_t I, class T, size_t N> const T&& get(const array<T, N>&& a);
+
+// UNSUPPORTED: c++98, c++03
+
+#include <array>
+#include <memory>
+#include <utility>
+#include <cassert>
+
+// std::array is explicitly allowed to be initialized with A a = { init-list };.
+// Disable the missing braces warning for this reason.
+#include "disable_missing_braces_warning.h"
+
+int main()
+{
+
+ {
+ typedef std::unique_ptr<double> T;
+ typedef std::array<T, 1> C;
+ const C c = {std::unique_ptr<double>(new double(3.5))};
+ const T&& t = std::get<0>(std::move(c));
+ assert(*t == 3.5);
+ }
+}
Index: include/utility
===================================================================
--- include/utility
+++ include/utility
@@ -120,6 +120,10 @@
typename tuple_element<I, pair<T1, T2> >::type&&
get(pair<T1, T2>&&) noexcept; // constexpr in C++14
+template<size_t I, class T1, class T2>
+ const typename tuple_element<I, pair<T1, T2> >::type&&
+ get(const pair<T1, T2>&&) noexcept; // constexpr in C++14
+
template<class T1, class T2>
constexpr T1& get(pair<T1, T2>&) noexcept; // C++14
@@ -129,6 +133,9 @@
template<size_t I, class T1, class T2>
constexpr T1&& get(pair<T1, T2>&&) noexcept; // C++14
+template<size_t I, class T1, class T2>
+ constexpr const T1&& get(const pair<T1, T2>&&) noexcept; // C++14
+
// C++14
template<class T, T... I>
@@ -560,6 +567,12 @@
_T1&&
get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);}
+ template <class _T1, class _T2>
+ static
+ _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+ const _T1&&
+ get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<const _T1>(__p.first);}
+
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
};
@@ -586,6 +599,12 @@
_T2&&
get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);}
+ template <class _T1, class _T2>
+ static
+ _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+ const _T2&&
+ get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<const _T2>(__p.second);}
+
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
};
@@ -615,6 +634,14 @@
return __get_pair<_Ip>::get(_VSTD::move(__p));
}
+template <size_t _Ip, class _T1, class _T2>
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+const typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
+get(const pair<_T1, _T2>&& __p) _NOEXCEPT
+{
+ return __get_pair<_Ip>::get(_VSTD::move(__p));
+}
+
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
#if _LIBCPP_STD_VER > 11
@@ -641,6 +668,13 @@
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY
+constexpr _T1 const && get(pair<_T1, _T2> const&& __p) _NOEXCEPT
+{
+ return __get_pair<0>::get(_VSTD::move(__p));
+}
+
+template <class _T1, class _T2>
+inline _LIBCPP_INLINE_VISIBILITY
constexpr _T1 & get(pair<_T2, _T1>& __p) _NOEXCEPT
{
return __get_pair<1>::get(__p);
@@ -660,6 +694,13 @@
return __get_pair<1>::get(_VSTD::move(__p));
}
+template <class _T1, class _T2>
+inline _LIBCPP_INLINE_VISIBILITY
+constexpr _T1 const && get(pair<_T2, _T1> const&& __p) _NOEXCEPT
+{
+ return __get_pair<1>::get(_VSTD::move(__p));
+}
+
#endif
#if _LIBCPP_STD_VER > 11
Index: include/tuple
===================================================================
--- include/tuple
+++ include/tuple
@@ -95,13 +95,18 @@
template <size_t I, class... T>
typename tuple_element<I, tuple<T...>>::type&&
get(tuple<T...>&&) noexcept; // constexpr in C++14
+template <size_t I, class... T>
+ const typename tuple_element<I, tuple<T...>>::type&&
+ get(const tuple<T...>&&) noexcept; // constexpr in C++14
template <class T1, class... T>
constexpr T1& get(tuple<T...>&) noexcept; // C++14
template <class T1, class... T>
constexpr const T1& get(const tuple<T...>&) noexcept; // C++14
template <class T1, class... T>
constexpr T1&& get(tuple<T...>&&) noexcept; // C++14
+template <class T1, class... T>
+ constexpr const T1&& get(const tuple<T...>&&) noexcept; // C++14
// 20.4.1.6, relational operators:
template<class... T, class... U> bool operator==(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
@@ -507,6 +512,8 @@
const typename tuple_element<_Jp, tuple<_Up...> >::type& get(const tuple<_Up...>&) _NOEXCEPT;
template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
typename tuple_element<_Jp, tuple<_Up...> >::type&& get(tuple<_Up...>&&) _NOEXCEPT;
+ template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
+ const typename tuple_element<_Jp, tuple<_Up...> >::type&& get(const tuple<_Up...>&&) _NOEXCEPT;
public:
template <bool _Dummy = true, class = typename enable_if<
@@ -766,6 +773,16 @@
static_cast<__tuple_leaf<_Ip, type>&&>(__t.base_).get());
}
+template <size_t _Ip, class ..._Tp>
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+const typename tuple_element<_Ip, tuple<_Tp...> >::type&&
+get(const tuple<_Tp...>&& __t) _NOEXCEPT
+{
+ typedef typename tuple_element<_Ip, tuple<_Tp...> >::type type;
+ return static_cast<const type&&>(
+ static_cast<const __tuple_leaf<_Ip, type>&&>(__t.base_).get());
+}
+
#if _LIBCPP_STD_VER > 11
// get by type
template <typename _T1, size_t _Idx, typename... _Args>
@@ -822,6 +839,13 @@
return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup));
}
+template <class _T1, class... _Args>
+inline _LIBCPP_INLINE_VISIBILITY
+constexpr _T1 const&& get(tuple<_Args...> const&& __tup) noexcept
+{
+ return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup));
+}
+
#endif
// tie
Index: include/array
===================================================================
--- include/array
+++ include/array
@@ -95,6 +95,7 @@
template <size_t I, class T, size_t N> T& get(array<T, N>&) noexcept; // constexpr in C++14
template <size_t I, class T, size_t N> const T& get(const array<T, N>&) noexcept; // constexpr in C++14
template <size_t I, class T, size_t N> T&& get(array<T, N>&&) noexcept; // constexpr in C++14
+template <size_t I, class T, size_t N> const T&& get(const array<T, N>&&) noexcept; // constexpr in C++14
} // std
@@ -324,6 +325,15 @@
return _VSTD::move(__a.__elems_[_Ip]);
}
+template <size_t _Ip, class _Tp, size_t _Size>
+inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+const _Tp&&
+get(const array<_Tp, _Size>&& __a) _NOEXCEPT
+{
+ static_assert(_Ip < _Size, "Index out of bounds in std::get<> (const std::array &&)");
+ return _VSTD::move(__a.__elems_[_Ip]);
+}
+
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
_LIBCPP_END_NAMESPACE_STD
Index: include/__tuple
===================================================================
--- include/__tuple
+++ include/__tuple
@@ -86,6 +86,11 @@
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
typename tuple_element<_Ip, tuple<_Tp...> >::type&&
get(tuple<_Tp...>&&) _NOEXCEPT;
+
+template <size_t _Ip, class ..._Tp>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+const typename tuple_element<_Ip, tuple<_Tp...> >::type&&
+get(const tuple<_Tp...>&&) _NOEXCEPT;
#endif
// pair specializations
@@ -109,6 +114,11 @@
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
get(pair<_T1, _T2>&&) _NOEXCEPT;
+
+template <size_t _Ip, class _T1, class _T2>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+const typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
+get(const pair<_T1, _T2>&&) _NOEXCEPT;
#endif
// array specializations
@@ -132,6 +142,11 @@
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
_Tp&&
get(array<_Tp, _Size>&&) _NOEXCEPT;
+
+template <size_t _Ip, class _Tp, size_t _Size>
+_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
+const _Tp&&
+get(const array<_Tp, _Size>&&) _NOEXCEPT;
#endif
#if !defined(_LIBCPP_HAS_NO_VARIADICS)
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