Introduce raii-compliant handle wrapper classes.

RAII_Samples/InstanceLayerProperties/InstanceLayerProperties.cpp

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+// Copyright(c) 2019, 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 : InstanceLayerProperties
+//                     Get global layer properties to know what layers are available to enable at CreateInstance time.
+
+#include "../utils/utils.hpp"
+
+#include <iostream>
+#include <sstream>
+#include <vector>
+
+int main( int /*argc*/, char ** /*argv*/ )
+{
+  try
+  {
+    std::unique_ptr<vk::raii::Context> context = vk::raii::su::make_unique<vk::raii::Context>();
+
+    /* VULKAN_KEY_START */
+
+    std::vector<vk::LayerProperties> layerProperties = context->enumerateInstanceLayerProperties();
+
+    std::cout << "Instance Layers:" << std::endl;
+    if ( layerProperties.empty() )
+    {
+      std::cout << "Set the environment variable VK_LAYER_PATH to point to the location of your layers" << std::endl;
+    }
+    for ( auto const & lp : layerProperties )
+    {
+      std::cout << lp.layerName << ":" << std::endl;
+      std::cout << "\tVersion: " << lp.implementationVersion << std::endl;
+      std::cout << "\tAPI Version: (" << ( lp.specVersion >> 22 ) << "." << ( ( lp.specVersion >> 12 ) & 0x03FF ) << "."
+                << ( lp.specVersion & 0xFFF ) << ")" << std::endl;
+      std::cout << "\tDescription: " << lp.description << std::endl;
+      std::cout << std::endl;
+    }
+
+    /* VULKAN_KEY_END */
+  }
+  catch ( vk::SystemError & err )
+  {
+    std::cout << "vk::SystemError: " << err.what() << std::endl;
+    exit( -1 );
+  }
+  catch ( std::exception & err )
+  {
+    std::cout << "std::runtexceptionime_error: " << err.what() << std::endl;
+    exit( -1 );
+  }
+  catch ( ... )
+  {
+    std::cout << "unknown error\n";
+    exit( -1 );
+  }
+  return 0;
+}