[libcxx-commits] [libcxx] 647af31 - [libcxx] adds concept `std::assignable_from`
Christopher Di Bella via libcxx-commits
libcxx-commits at lists.llvm.org
Wed Mar 3 22:42:23 PST 2021
Author: Christopher Di Bella
Date: 2021-03-03T22:41:55-08:00
New Revision: 647af31e74830e067834f50985f18ac7cc16c2a3
URL: https://github.com/llvm/llvm-project/commit/647af31e74830e067834f50985f18ac7cc16c2a3
DIFF: https://github.com/llvm/llvm-project/commit/647af31e74830e067834f50985f18ac7cc16c2a3.diff
LOG: [libcxx] adds concept `std::assignable_from`
Implements parts of:
- P0898R3 Standard Library Concepts
- P1754 Rename concepts to standard_case for C++20, while we still can
Depends on D96660
Reviewed By: ldionne, #libc
Differential Revision: https://reviews.llvm.org/D96742
Added:
libcxx/test/std/concepts/lang/assignable.compile.pass.cpp
Modified:
libcxx/include/concepts
Removed:
################################################################################
diff --git a/libcxx/include/concepts b/libcxx/include/concepts
index f13b18fec6f1..505ade904223 100644
--- a/libcxx/include/concepts
+++ b/libcxx/include/concepts
@@ -210,6 +210,15 @@ concept unsigned_integral = integral<_Tp> && !signed_integral<_Tp>;
template<class _Tp>
concept floating_point = is_floating_point_v<_Tp>;
+// [concept.assignable]
+template<class _Lhs, class _Rhs>
+concept assignable_from =
+ is_lvalue_reference_v<_Lhs> &&
+ common_reference_with<const remove_reference_t<_Lhs>&, const remove_reference_t<_Rhs>&> &&
+ requires (_Lhs __lhs, _Rhs&& __rhs) {
+ { __lhs = _VSTD::forward<_Rhs>(__rhs) } -> same_as<_Lhs>;
+ };
+
// [concept.destructible]
template<class _Tp>
diff --git a/libcxx/test/std/concepts/lang/assignable.compile.pass.cpp b/libcxx/test/std/concepts/lang/assignable.compile.pass.cpp
new file mode 100644
index 000000000000..450c0bc56c7f
--- /dev/null
+++ b/libcxx/test/std/concepts/lang/assignable.compile.pass.cpp
@@ -0,0 +1,555 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: libcpp-no-concepts
+
+// template<class From, class To>
+// concept assignable_from;
+
+#include <concepts>
+
+#include <deque>
+#include <forward_list>
+#include <list>
+#include <map>
+#include <memory>
+#include <mutex>
+#include <optional>
+#include <string>
+#include <string_view>
+#include <unordered_map>
+#include <vector>
+
+#include "../support/allocators.h"
+
+// Note: is_lvalue_reference is checked in all ModelsAssignableFrom calls.
+template <typename T1, typename T2>
+constexpr void NeverAssignableFrom() {
+ static_assert(!std::assignable_from<T1, T2>);
+ static_assert(!std::assignable_from<T1, const T2>);
+ static_assert(!std::assignable_from<T1, T2&>);
+ static_assert(!std::assignable_from<T1, const T2&>);
+ static_assert(!std::assignable_from<T1, volatile T2&>);
+ static_assert(!std::assignable_from<T1, const volatile T2&>);
+ static_assert(!std::assignable_from<T1, T2&&>);
+ static_assert(!std::assignable_from<T1, const T2&&>);
+ static_assert(!std::assignable_from<T1, volatile T2&&>);
+ static_assert(!std::assignable_from<T1, const volatile T2&&>);
+
+ static_assert(!std::assignable_from<const volatile T1&, T2>);
+ static_assert(!std::assignable_from<const volatile T1&, const T2>);
+ static_assert(!std::assignable_from<const volatile T1&, T2&>);
+ static_assert(!std::assignable_from<const volatile T1&, const T2&>);
+ static_assert(!std::assignable_from<const volatile T1&, volatile T2&>);
+ static_assert(!std::assignable_from<const volatile T1&, const volatile T2&>);
+ static_assert(!std::assignable_from<const volatile T1&, T2&&>);
+ static_assert(!std::assignable_from<const volatile T1&, const T2&&>);
+ static_assert(!std::assignable_from<const volatile T1&, volatile T2&&>);
+ static_assert(!std::assignable_from<const volatile T1&, const volatile T2&&>);
+
+ static_assert(!std::assignable_from<T1&&, T2>);
+ static_assert(!std::assignable_from<T1&&, const T2>);
+ static_assert(!std::assignable_from<T1&&, T2&>);
+ static_assert(!std::assignable_from<T1&&, const T2&>);
+ static_assert(!std::assignable_from<T1&&, volatile T2&>);
+ static_assert(!std::assignable_from<T1&&, const volatile T2&>);
+ static_assert(!std::assignable_from<T1&&, T2&&>);
+ static_assert(!std::assignable_from<T1&&, const T2&&>);
+ static_assert(!std::assignable_from<T1&&, volatile T2&&>);
+ static_assert(!std::assignable_from<T1&&, const volatile T2&&>);
+
+ static_assert(!std::assignable_from<const T1&&, T2>);
+ static_assert(!std::assignable_from<const T1&&, const T2>);
+ static_assert(!std::assignable_from<const T1&&, T2&>);
+ static_assert(!std::assignable_from<const T1&&, const T2&>);
+ static_assert(!std::assignable_from<const T1&&, volatile T2&>);
+ static_assert(!std::assignable_from<const T1&&, const volatile T2&>);
+ static_assert(!std::assignable_from<const T1&&, T2&&>);
+ static_assert(!std::assignable_from<const T1&&, const T2&&>);
+ static_assert(!std::assignable_from<const T1&&, volatile T2&&>);
+ static_assert(!std::assignable_from<const T1&&, const volatile T2&&>);
+
+ static_assert(!std::assignable_from<volatile T1&&, T2>);
+ static_assert(!std::assignable_from<volatile T1&&, const T2>);
+ static_assert(!std::assignable_from<volatile T1&&, T2&>);
+ static_assert(!std::assignable_from<volatile T1&&, const T2&>);
+ static_assert(!std::assignable_from<volatile T1&&, volatile T2&>);
+ static_assert(!std::assignable_from<volatile T1&&, const volatile T2&>);
+ static_assert(!std::assignable_from<volatile T1&&, T2&&>);
+ static_assert(!std::assignable_from<volatile T1&&, const T2&&>);
+ static_assert(!std::assignable_from<volatile T1&&, volatile T2&&>);
+ static_assert(!std::assignable_from<volatile T1&&, const volatile T2&&>);
+
+ static_assert(!std::assignable_from<const volatile T1&&, T2>);
+ static_assert(!std::assignable_from<const volatile T1&&, const T2>);
+ static_assert(!std::assignable_from<const volatile T1&&, T2&>);
+ static_assert(!std::assignable_from<const volatile T1&&, const T2&>);
+ static_assert(!std::assignable_from<const volatile T1&&, volatile T2&>);
+ static_assert(!std::assignable_from<const volatile T1&&, const volatile T2&>);
+ static_assert(!std::assignable_from<const volatile T1&&, T2&&>);
+ static_assert(!std::assignable_from<const volatile T1&&, const T2&&>);
+ static_assert(!std::assignable_from<const volatile T1&&, volatile T2&&>);
+ static_assert(
+ !std::assignable_from<const volatile T1&&, const volatile T2&&>);
+
+ static_assert(!std::assignable_from<const T1&, T2>);
+ static_assert(!std::assignable_from<const T1&, const T2>);
+ static_assert(!std::assignable_from<const T1&, T2&>);
+ static_assert(!std::assignable_from<const T1&, const T2&>);
+ static_assert(!std::assignable_from<const T1&, volatile T2&>);
+ static_assert(!std::assignable_from<const T1&, const volatile T2&>);
+ static_assert(!std::assignable_from<const T1&, T2&&>);
+ static_assert(!std::assignable_from<const T1&, const T2&&>);
+ static_assert(!std::assignable_from<const T1&, volatile T2&&>);
+ static_assert(!std::assignable_from<const T1&, const volatile T2&&>);
+
+ static_assert(!std::assignable_from<const volatile T1&, T2>);
+ static_assert(!std::assignable_from<const volatile T1&, const T2>);
+ static_assert(!std::assignable_from<const volatile T1&, T2&>);
+ static_assert(!std::assignable_from<const volatile T1&, const T2&>);
+ static_assert(!std::assignable_from<const volatile T1&, volatile T2&>);
+ static_assert(!std::assignable_from<const volatile T1&, const volatile T2&>);
+ static_assert(!std::assignable_from<const volatile T1&, T2&&>);
+ static_assert(!std::assignable_from<const volatile T1&, const T2&&>);
+ static_assert(!std::assignable_from<const volatile T1&, volatile T2&&>);
+ static_assert(!std::assignable_from<const volatile T1&, const volatile T2&&>);
+}
+
+template <typename T1, typename T2>
+constexpr bool CheckAssignableFromRvalues() {
+ NeverAssignableFrom<T1, T2>();
+
+ constexpr auto Result = std::assignable_from<T1&, T2>;
+ static_assert(std::assignable_from<T1&, T2&&> == Result);
+
+ return Result;
+}
+
+template <typename T1, typename T2>
+constexpr bool CheckAssignableFromLvalues() {
+ NeverAssignableFrom<T1, T2>();
+
+ constexpr auto Result = std::assignable_from<T1&, const T2&>;
+ static_assert(std::assignable_from<T1&, T2&> == Result);
+ static_assert(std::assignable_from<T1&, const T2&> == Result);
+
+ return Result;
+}
+
+template <typename T1, typename T2>
+constexpr bool CheckAssignableFromLvaluesAndRvalues() {
+ return CheckAssignableFromLvalues<T1, T2>() &&
+ CheckAssignableFromRvalues<T1, T2>();
+}
+
+namespace BuiltinTypes {
+static_assert(CheckAssignableFromLvaluesAndRvalues<int, int>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<int, double>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<double, int>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<int*, int*>());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<int*, const int*>());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<int*, volatile int*>());
+static_assert(
+ !CheckAssignableFromLvaluesAndRvalues<int*, const volatile int*>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<const int*, int*>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<const int*, const int*>());
+static_assert(
+ !CheckAssignableFromLvaluesAndRvalues<const int*, volatile int*>());
+static_assert(
+ !CheckAssignableFromLvaluesAndRvalues<const int*, const volatile int*>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<volatile int*, int*>());
+static_assert(
+ !CheckAssignableFromLvaluesAndRvalues<volatile int*, const int*>());
+static_assert(
+ CheckAssignableFromLvaluesAndRvalues<volatile int*, volatile int*>());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<volatile int*,
+ const volatile int*>());
+static_assert(
+ CheckAssignableFromLvaluesAndRvalues<const volatile int*, int*>());
+static_assert(
+ CheckAssignableFromLvaluesAndRvalues<const volatile int*, const int*>());
+static_assert(
+ CheckAssignableFromLvaluesAndRvalues<const volatile int*, volatile int*>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<const volatile int*,
+ const volatile int*>());
+
+static_assert(CheckAssignableFromLvaluesAndRvalues<int (*)(), int (*)()>());
+static_assert(
+ CheckAssignableFromLvaluesAndRvalues<int (*)(), int (*)() noexcept>());
+static_assert(
+ !CheckAssignableFromLvaluesAndRvalues<int (*)() noexcept, int (*)()>());
+
+struct S {};
+static_assert(CheckAssignableFromLvaluesAndRvalues<int S::*, int S::*>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<const int S::*, int S::*>());
+static_assert(
+ CheckAssignableFromLvaluesAndRvalues<int (S::*)(), int (S::*)()>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<int (S::*)(),
+ int (S::*)() noexcept>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<int (S::*)() const,
+ int (S::*)() const>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<
+ int (S::*)() const, int (S::*)() const noexcept>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<int (S::*)() volatile,
+ int (S::*)() volatile>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<
+ int (S::*)() volatile, int (S::*)() volatile noexcept>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<
+ int (S::*)() const volatile, int (S::*)() const volatile>());
+static_assert(
+ CheckAssignableFromLvaluesAndRvalues<
+ int (S::*)() const volatile, int (S::*)() const volatile noexcept>());
+
+static_assert(!std::assignable_from<void, int>);
+static_assert(!std::assignable_from<void, void>);
+static_assert(!std::assignable_from<int*&, long*>);
+static_assert(!std::assignable_from<int (&)[5], int[5]>);
+static_assert(!std::assignable_from<int (S::*&)(), int (S::*)() const>);
+static_assert(!std::assignable_from<int (S::*&)() const, int (S::*)()>);
+static_assert(!std::assignable_from<int (S::*&)(), int (S::*)() volatile>);
+static_assert(!std::assignable_from<int (S::*&)() volatile, int (S::*)()>);
+static_assert(
+ !std::assignable_from<int (S::*&)(), int (S::*)() const volatile>);
+static_assert(
+ !std::assignable_from<int (S::*&)() const volatile, int (S::*)()>);
+static_assert(!std::assignable_from<int (S::*&)() noexcept, int (S::*)()>);
+static_assert(
+ !std::assignable_from<int (S::*&)() const noexcept, int (S::*)() const>);
+static_assert(!std::assignable_from<int (S::*&)() volatile noexcept,
+ int (S::*)() volatile>);
+static_assert(!std::assignable_from<int (S::*&)() const volatile noexcept,
+ int (S::*)() const volatile>);
+} // namespace BuiltinTypes
+
+namespace TypesFitForPurpose {
+struct T1 {};
+
+struct NoCommonReference {};
+static_assert(!std::common_reference_with<const T1&, const NoCommonReference&>);
+static_assert(!std::assignable_from<NoCommonReference&, T1>);
+
+struct AssignmentReturnsNonReference {
+ AssignmentReturnsNonReference operator=(T1);
+ operator T1() const;
+};
+static_assert(std::common_reference_with<const T1&,
+ const AssignmentReturnsNonReference&>);
+static_assert(!std::assignable_from<AssignmentReturnsNonReference&, T1>);
+
+struct NonCVAssignmentOnly {
+ NonCVAssignmentOnly& operator=(T1);
+ operator T1() const;
+};
+static_assert(
+ std::common_reference_with<const T1&, const NonCVAssignmentOnly&>);
+static_assert(std::assignable_from<NonCVAssignmentOnly&, T1>);
+static_assert(!std::assignable_from<const NonCVAssignmentOnly&, T1>);
+static_assert(!std::assignable_from<volatile NonCVAssignmentOnly&, T1>);
+static_assert(!std::assignable_from<const volatile NonCVAssignmentOnly&, T1>);
+
+struct NonCVAssignmentOnlyConstQualified {
+ NonCVAssignmentOnlyConstQualified& operator=(T1) const;
+ operator T1() const;
+};
+static_assert(std::common_reference_with<
+ const T1&, const NonCVAssignmentOnlyConstQualified&>);
+static_assert(std::assignable_from<NonCVAssignmentOnlyConstQualified&, T1>);
+static_assert(
+ !std::assignable_from<const NonCVAssignmentOnlyConstQualified&, T1>);
+static_assert(
+ !std::assignable_from<volatile NonCVAssignmentOnlyConstQualified&, T1>);
+static_assert(!std::assignable_from<
+ const volatile NonCVAssignmentOnlyConstQualified&, T1>);
+
+struct NonCVAssignmentVolatileQualified {
+ NonCVAssignmentVolatileQualified& operator=(T1) volatile;
+ operator T1() const volatile;
+};
+static_assert(std::common_reference_with<
+ const T1&, const NonCVAssignmentVolatileQualified&>);
+static_assert(std::assignable_from<NonCVAssignmentVolatileQualified&, T1>);
+static_assert(
+ !std::assignable_from<const NonCVAssignmentVolatileQualified&, T1>);
+static_assert(
+ !std::assignable_from<volatile NonCVAssignmentVolatileQualified&, T1>);
+static_assert(!std::assignable_from<
+ const volatile NonCVAssignmentVolatileQualified&, T1>);
+
+struct NonCVAssignmentOnlyCVQualified {
+ NonCVAssignmentOnlyCVQualified& operator=(T1) const volatile;
+ operator T1() const volatile;
+};
+static_assert(std::common_reference_with<
+ const T1&, const NonCVAssignmentOnlyCVQualified&>);
+static_assert(std::assignable_from<NonCVAssignmentOnlyCVQualified&, T1>);
+static_assert(!std::assignable_from<const NonCVAssignmentOnlyCVQualified&, T1>);
+static_assert(
+ !std::assignable_from<volatile NonCVAssignmentOnlyCVQualified&, T1>);
+static_assert(
+ !std::assignable_from<const volatile NonCVAssignmentOnlyCVQualified&, T1>);
+
+struct ConstAssignmentOnly {
+ const ConstAssignmentOnly& operator=(T1) const;
+ operator T1() const;
+};
+static_assert(
+ std::common_reference_with<const T1&, const ConstAssignmentOnly&>);
+static_assert(std::assignable_from<const ConstAssignmentOnly&, T1>);
+static_assert(!std::assignable_from<ConstAssignmentOnly&, T1>);
+static_assert(!std::assignable_from<volatile ConstAssignmentOnly&, T1>);
+static_assert(!std::assignable_from<const volatile ConstAssignmentOnly&, T1>);
+
+struct VolatileAssignmentOnly {
+ volatile VolatileAssignmentOnly& operator=(T1) volatile;
+ operator T1() const volatile;
+};
+static_assert(
+ std::common_reference_with<const T1&, const VolatileAssignmentOnly&>);
+static_assert(!std::assignable_from<VolatileAssignmentOnly&, T1>);
+static_assert(std::assignable_from<volatile VolatileAssignmentOnly&, T1>);
+
+struct CVAssignmentOnly {
+ const volatile CVAssignmentOnly& operator=(T1) const volatile;
+ operator T1() const volatile;
+};
+static_assert(std::common_reference_with<const T1&, const CVAssignmentOnly&>);
+static_assert(std::assignable_from<const volatile CVAssignmentOnly&, T1>);
+static_assert(!std::assignable_from<CVAssignmentOnly&, T1>);
+static_assert(!std::assignable_from<const CVAssignmentOnly&, T1>);
+static_assert(!std::assignable_from<volatile CVAssignmentOnly&, T1>);
+
+struct LvalueRefQualifiedWithRvalueT1Only {
+ LvalueRefQualifiedWithRvalueT1Only& operator=(T1&&) &;
+ const LvalueRefQualifiedWithRvalueT1Only& operator=(T1&&) const&;
+ volatile LvalueRefQualifiedWithRvalueT1Only& operator=(T1&&) volatile&;
+ const volatile LvalueRefQualifiedWithRvalueT1Only& operator=(T1&&) const
+ volatile&;
+ operator T1() const volatile;
+};
+static_assert(std::common_reference_with<
+ const T1&, const LvalueRefQualifiedWithRvalueT1Only&>);
+static_assert(std::assignable_from<LvalueRefQualifiedWithRvalueT1Only&, T1&&>);
+static_assert(
+ std::assignable_from<const LvalueRefQualifiedWithRvalueT1Only&, T1&&>);
+static_assert(
+ std::assignable_from<volatile LvalueRefQualifiedWithRvalueT1Only&, T1&&>);
+static_assert(std::assignable_from<
+ const volatile LvalueRefQualifiedWithRvalueT1Only&, T1&&>);
+static_assert(!std::assignable_from<LvalueRefQualifiedWithRvalueT1Only&, T1&>);
+static_assert(
+ !std::assignable_from<const LvalueRefQualifiedWithRvalueT1Only&, T1&>);
+static_assert(
+ !std::assignable_from<volatile LvalueRefQualifiedWithRvalueT1Only&, T1&>);
+static_assert(!std::assignable_from<
+ const volatile LvalueRefQualifiedWithRvalueT1Only&, T1&>);
+static_assert(
+ !std::assignable_from<LvalueRefQualifiedWithRvalueT1Only&, const T1&>);
+static_assert(!std::assignable_from<const LvalueRefQualifiedWithRvalueT1Only&,
+ const T1&>);
+static_assert(!std::assignable_from<
+ volatile LvalueRefQualifiedWithRvalueT1Only&, const T1&>);
+static_assert(!std::assignable_from<
+ const volatile LvalueRefQualifiedWithRvalueT1Only&, const T1&>);
+static_assert(
+ !std::assignable_from<LvalueRefQualifiedWithRvalueT1Only&, volatile T1&>);
+static_assert(!std::assignable_from<const LvalueRefQualifiedWithRvalueT1Only&,
+ volatile T1&>);
+static_assert(!std::assignable_from<
+ volatile LvalueRefQualifiedWithRvalueT1Only&, volatile T1&>);
+static_assert(
+ !std::assignable_from<const volatile LvalueRefQualifiedWithRvalueT1Only&,
+ volatile T1&>);
+static_assert(!std::assignable_from<LvalueRefQualifiedWithRvalueT1Only&,
+ const volatile T1&>);
+static_assert(!std::assignable_from<const LvalueRefQualifiedWithRvalueT1Only&,
+ const volatile T1&>);
+static_assert(
+ !std::assignable_from<volatile LvalueRefQualifiedWithRvalueT1Only&,
+ const volatile T1&>);
+static_assert(
+ !std::assignable_from<const volatile LvalueRefQualifiedWithRvalueT1Only&,
+ const volatile T1&>);
+static_assert(
+ !std::assignable_from<LvalueRefQualifiedWithRvalueT1Only&, const T1&&>);
+static_assert(!std::assignable_from<const LvalueRefQualifiedWithRvalueT1Only&,
+ const T1&&>);
+static_assert(!std::assignable_from<
+ volatile LvalueRefQualifiedWithRvalueT1Only&, const T1&&>);
+static_assert(!std::assignable_from<
+ const volatile LvalueRefQualifiedWithRvalueT1Only&, const T1&&>);
+static_assert(
+ !std::assignable_from<LvalueRefQualifiedWithRvalueT1Only&, volatile T1&&>);
+static_assert(!std::assignable_from<const LvalueRefQualifiedWithRvalueT1Only&,
+ volatile T1&&>);
+static_assert(!std::assignable_from<
+ volatile LvalueRefQualifiedWithRvalueT1Only&, volatile T1&&>);
+static_assert(
+ !std::assignable_from<const volatile LvalueRefQualifiedWithRvalueT1Only&,
+ volatile T1&&>);
+static_assert(!std::assignable_from<LvalueRefQualifiedWithRvalueT1Only&,
+ const volatile T1&&>);
+static_assert(!std::assignable_from<const LvalueRefQualifiedWithRvalueT1Only&,
+ const volatile T1&&>);
+static_assert(
+ !std::assignable_from<volatile LvalueRefQualifiedWithRvalueT1Only&,
+ const volatile T1&&>);
+static_assert(
+ !std::assignable_from<const volatile LvalueRefQualifiedWithRvalueT1Only&,
+ const volatile T1&&>);
+
+struct NoLvalueRefAssignment {
+ NoLvalueRefAssignment& operator=(T1) &&;
+ const NoLvalueRefAssignment& operator=(T1) const&&;
+ volatile NoLvalueRefAssignment& operator=(T1) volatile&&;
+ const volatile NoLvalueRefAssignment& operator=(T1) const volatile&&;
+ operator T1() const volatile;
+};
+static_assert(
+ std::common_reference_with<const T1&, const NoLvalueRefAssignment&>);
+static_assert(!std::assignable_from<NoLvalueRefAssignment&, T1>);
+static_assert(!std::assignable_from<NoLvalueRefAssignment&, const T1>);
+static_assert(!std::assignable_from<NoLvalueRefAssignment&, volatile T1>);
+static_assert(!std::assignable_from<NoLvalueRefAssignment&, const volatile T1>);
+static_assert(!std::assignable_from<const NoLvalueRefAssignment&, T1>);
+static_assert(!std::assignable_from<const NoLvalueRefAssignment&, const T1>);
+static_assert(!std::assignable_from<const NoLvalueRefAssignment&, volatile T1>);
+static_assert(
+ !std::assignable_from<const NoLvalueRefAssignment&, const volatile T1>);
+static_assert(!std::assignable_from<volatile NoLvalueRefAssignment&, T1>);
+static_assert(!std::assignable_from<volatile NoLvalueRefAssignment&, const T1>);
+static_assert(
+ !std::assignable_from<volatile NoLvalueRefAssignment&, volatile T1>);
+static_assert(
+ !std::assignable_from<volatile NoLvalueRefAssignment&, const volatile T1>);
+static_assert(!std::assignable_from<const volatile NoLvalueRefAssignment&, T1>);
+static_assert(
+ !std::assignable_from<const volatile NoLvalueRefAssignment&, const T1>);
+static_assert(
+ !std::assignable_from<const volatile NoLvalueRefAssignment&, volatile T1>);
+static_assert(!std::assignable_from<const volatile NoLvalueRefAssignment&,
+ const volatile T1>);
+} // namespace TypesFitForPurpose
+
+namespace StandardTypes {
+static_assert(
+ CheckAssignableFromLvaluesAndRvalues<std::deque<int>, std::deque<int> >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<std::deque<int>,
+ std::deque<const int> >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<
+ std::deque<int>, std::deque<int, A1<int> > >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<std::deque<int>,
+ std::vector<int> >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<std::deque<int>, int>());
+
+static_assert(CheckAssignableFromLvaluesAndRvalues<std::forward_list<int>,
+ std::forward_list<int> >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<
+ std::forward_list<int>, std::forward_list<const int> >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<
+ std::forward_list<int>, std::forward_list<int, A1<int> > >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<std::forward_list<int>,
+ std::vector<int> >());
+static_assert(
+ !CheckAssignableFromLvaluesAndRvalues<std::forward_list<int>, int>());
+
+static_assert(
+ CheckAssignableFromLvaluesAndRvalues<std::list<int>, std::list<int> >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<std::list<int>,
+ std::list<const int> >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<
+ std::list<int>, std::list<int, A1<int> > >());
+static_assert(
+ !CheckAssignableFromLvaluesAndRvalues<std::list<int>, std::vector<int> >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<std::list<int>, int>());
+
+static_assert(CheckAssignableFromLvaluesAndRvalues<std::map<int, void*>,
+ std::map<int, void*> >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<
+ std::map<int, void*>, std::map<const int, void*> >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<
+ std::map<int, void*>,
+ std::map<int, void*, A1<std::pair<int, void*> > > >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<
+ std::map<int, void*>, std::unordered_map<int, void*> >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<std::map<int, void*>,
+ std::pair<int, void*> >());
+
+#ifndef _LIBCPP_HAS_NO_THREADS
+static_assert(!CheckAssignableFromRvalues<std::mutex, std::mutex>());
+static_assert(!CheckAssignableFromLvalues<std::mutex, std::mutex>());
+#endif
+
+static_assert(CheckAssignableFromLvaluesAndRvalues<std::optional<int>, int>());
+static_assert(
+ CheckAssignableFromLvaluesAndRvalues<std::optional<int>, double>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<std::optional<int>,
+ std::optional<int> >());
+static_assert(
+ !CheckAssignableFromLvaluesAndRvalues<int, std::optional<int> >());
+static_assert(
+ !CheckAssignableFromLvaluesAndRvalues<double, std::optional<int> >());
+
+static_assert(
+ !std::common_reference_with<std::optional<int>, std::optional<double> >);
+static_assert(
+ !CheckAssignableFromRvalues<std::optional<int>, std::optional<double> >());
+static_assert(
+ !CheckAssignableFromLvalues<std::optional<int>, std::optional<double> >());
+
+static_assert(CheckAssignableFromLvaluesAndRvalues<std::string, std::string>());
+static_assert(
+ CheckAssignableFromLvaluesAndRvalues<std::string, std::string_view>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<std::string, char*>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<std::string, const char*>());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<
+ std::string, std::basic_string<wchar_t> >());
+static_assert(
+ !CheckAssignableFromLvaluesAndRvalues<std::string, std::vector<char> >());
+
+static_assert(
+ CheckAssignableFromLvaluesAndRvalues<std::string_view, std::string_view>());
+static_assert(
+ CheckAssignableFromLvaluesAndRvalues<std::string_view, std::string>());
+static_assert(CheckAssignableFromLvaluesAndRvalues<std::string_view, char*>());
+static_assert(
+ CheckAssignableFromLvaluesAndRvalues<std::string_view, const char*>());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<
+ std::string_view, std::basic_string_view<wchar_t> >());
+
+static_assert(
+ CheckAssignableFromRvalues<std::unique_ptr<int>, std::unique_ptr<int> >());
+static_assert(
+ !CheckAssignableFromLvalues<std::unique_ptr<int>, std::unique_ptr<int> >());
+
+static_assert(
+ CheckAssignableFromLvaluesAndRvalues<std::unordered_map<int, void*>,
+ std::unordered_map<int, void*> >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<
+ std::unordered_map<int, void*>,
+ std::unordered_map<const int, void*> >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<
+ std::unordered_map<int, void*>,
+ std::unordered_map<int, void*, A1<std::pair<int, void*> > > >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<
+ std::unordered_map<int, void*>, std::map<int, void*> >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<
+ std::unordered_map<int, void*>, std::pair<int, void*> >());
+
+static_assert(CheckAssignableFromLvaluesAndRvalues<std::vector<int>,
+ std::vector<int> >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<std::vector<int>,
+ std::vector<const int> >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<
+ std::vector<int>, std::vector<int, A1<int> > >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<std::vector<int>,
+ std::deque<int> >());
+static_assert(!CheckAssignableFromLvaluesAndRvalues<std::vector<int>, int>());
+} // namespace StandardTypes
+
+int main(int, char**) { return 0; }
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