Provide std::hash<vk::HandleType> to make handles hashable.

tests/Hash/CMakeLists.txt

@@ -0,0 +1,37 @@
+# Copyright(c) 2018, NVIDIA CORPORATION. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+cmake_minimum_required(VERSION 3.2)
+
+if (NOT TESTS_BUILD_ONLY_DYNAMIC)
+	project(Hash)
+
+	set(HEADERS
+	)
+
+	set(SOURCES
+	  Hash.cpp
+	)
+
+	source_group(headers FILES ${HEADERS})
+	source_group(sources FILES ${SOURCES})
+
+	add_executable(Hash
+	  ${HEADERS}
+	  ${SOURCES}
+	)
+
+	set_target_properties(Hash PROPERTIES FOLDER "Tests")
+	target_link_libraries(Hash "${Vulkan_LIBRARIES}")
+endif()

tests/Hash/Hash.cpp

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+// Copyright(c) 2018, NVIDIA CORPORATION. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// VulkanHpp Samples : Hash
+//                     Compile test on using std::hash on handles
+
+#include "vulkan/vulkan.hpp"
+#include <iostream>
+#include <unordered_map>
+#include <unordered_set>
+
+static char const* AppName = "Hash";
+static char const* EngineName = "Vulkan.hpp";
+
+int main(int /*argc*/, char ** /*argv*/)
+{
+  try
+  {
+    vk::ApplicationInfo appInfo(AppName, 1, EngineName, 1, VK_API_VERSION_1_1);
+    vk::UniqueInstance instance = vk::createInstanceUnique(vk::InstanceCreateInfo({}, &appInfo));
+
+    auto h1 = std::hash<vk::Instance>{}(*instance);
+    auto h2 = std::hash<VkInstance>{}(*instance);
+    assert(h1 == h2);
+
+    std::unordered_set<vk::Instance> uset;
+    uset.insert(*instance);
+
+    std::unordered_map<vk::Instance, size_t> umap;
+    umap[*instance] = 1;
+  }
+  catch (vk::SystemError const& err)
+  {
+    std::cout << "vk::SystemError: " << err.what() << std::endl;
+    exit(-1);
+  }
+  catch (...)
+  {
+    std::cout << "unknown error\n";
+    exit(-1);
+  }
+
+  return 0;
+}