Add <variant> tests but disable them for libc++
llvm-svn: 287728
diff --git a/libcxx/test/support/variant_test_helpers.hpp b/libcxx/test/support/variant_test_helpers.hpp
new file mode 100644
index 0000000..2771672
--- /dev/null
+++ b/libcxx/test/support/variant_test_helpers.hpp
@@ -0,0 +1,81 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// 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.
+//
+//===----------------------------------------------------------------------===//
+#ifndef SUPPORT_VARIANT_TEST_HELPERS_HPP
+#define SUPPORT_VARIANT_TEST_HELPERS_HPP
+
+#include <type_traits>
+#include <utility>
+#include <cassert>
+
+#include "test_macros.h"
+
+#if TEST_STD_VER <= 14
+#error This file requires C++17
+#endif
+
+// FIXME: Currently the variant<T&> tests are disabled using this macro.
+#define TEST_VARIANT_HAS_NO_REFERENCES
+
+#ifndef TEST_HAS_NO_EXCEPTIONS
+struct CopyThrows {
+ CopyThrows() = default;
+ CopyThrows(CopyThrows const&) { throw 42; }
+ CopyThrows& operator=(CopyThrows const&) { throw 42; }
+};
+
+struct MoveThrows {
+ static int alive;
+ MoveThrows() { ++alive; }
+ MoveThrows(MoveThrows const&) {++alive;}
+ MoveThrows(MoveThrows&&) { throw 42; }
+ MoveThrows& operator=(MoveThrows const&) { return *this; }
+ MoveThrows& operator=(MoveThrows&&) { throw 42; }
+ ~MoveThrows() { --alive; }
+};
+
+int MoveThrows::alive = 0;
+
+struct MakeEmptyT {
+ static int alive;
+ MakeEmptyT() { ++alive; }
+ MakeEmptyT(MakeEmptyT const&) {
+ ++alive;
+ // Don't throw from the copy constructor since variant's assignment
+ // operator performs a copy before committing to the assignment.
+ }
+ MakeEmptyT(MakeEmptyT &&) {
+ throw 42;
+ }
+ MakeEmptyT& operator=(MakeEmptyT const&) {
+ throw 42;
+ }
+ MakeEmptyT& operator=(MakeEmptyT&&) {
+ throw 42;
+ }
+ ~MakeEmptyT() { --alive; }
+};
+static_assert(std::is_swappable_v<MakeEmptyT>, ""); // required for test
+
+int MakeEmptyT::alive = 0;
+
+template <class Variant>
+void makeEmpty(Variant& v) {
+ Variant v2(std::in_place_type<MakeEmptyT>);
+ try {
+ v = v2;
+ assert(false);
+ } catch (...) {
+ assert(v.valueless_by_exception());
+ }
+}
+#endif // TEST_HAS_NO_EXCEPTIONS
+
+
+#endif // SUPPORT_VARIANT_TEST_HELPERS_HPP