From 2dce7e6e21a05c45a4784e3c93d555ec88bc3745 Mon Sep 17 00:00:00 2001
From: MerryMage <MerryMage@users.noreply.github.com>
Date: Mon, 15 Oct 2018 21:00:44 +0100
Subject: [PATCH] Common: Add variant utilities

---
 Source/Core/Common/Common.vcxproj |  1 +
 Source/Core/Common/VariantUtil.h  | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 Source/Core/Common/VariantUtil.h

diff --git a/Source/Core/Common/Common.vcxproj b/Source/Core/Common/Common.vcxproj
index 9939e0ccd3..a768f0c687 100644
--- a/Source/Core/Common/Common.vcxproj
+++ b/Source/Core/Common/Common.vcxproj
@@ -159,6 +159,7 @@
     <ClInclude Include="TraversalClient.h" />
     <ClInclude Include="TraversalProto.h" />
     <ClInclude Include="UPnP.h" />
+    <ClInclude Include="VariantUtil.h" />
     <ClInclude Include="Version.h" />
     <ClInclude Include="WorkQueueThread.h" />
     <ClInclude Include="x64ABI.h" />
diff --git a/Source/Core/Common/VariantUtil.h b/Source/Core/Common/VariantUtil.h
new file mode 100644
index 0000000000..c865ad9681
--- /dev/null
+++ b/Source/Core/Common/VariantUtil.h
@@ -0,0 +1,26 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <variant>
+
+namespace detail
+{
+template <typename... From>
+struct VariantCastProxy
+{
+  const std::variant<From...>& v;
+
+  template <typename... To>
+  operator std::variant<To...>() const
+  {
+    return std::visit([](auto&& arg) { return std::variant<To...>{arg}; }, v);
+  }
+};
+}  // namespace detail
+
+template <typename... From>
+auto VariantCast(const std::variant<From...>& v)
+{
+  return detail::VariantCastProxy<From...>{v};
+}