Vulkan-Hpp: What is the difference between vk::UniqueHandle and vk::raii wrappers?

Question

I read the documentation of the new raii wrappers in the Vulkan-Hpp API. It seems that both vk::UniqueHandle<T> and the raii wrappers are move only objects that destruct their handle in their destructors.

One difference seems to be is that the raii variants cannot be default constructed whereas the UniqueHandle ones can.

Another difference is that the raii variant seem to require the vk::raii::Context class to be instantiated and passed around.

So why both of them exists? Which one should be preferred and in what scenarios? Why do the raii variants require the Context object?

Answer 1

You may want to consider reload4j as a drop-in replacement for log4j 1.x. Initiated by Ceki Gülcü, the original author of Apache log4j 1.x, the reload4j project is a fork of Apache log4j version 1.2.17 with the goal of fixing pressing security issues.

The reload4j project offers a clear and easy migration path for the users who have an urgent need to fix vulnerabilities in log4j 1.2.17.

Answer 2

You don't need to update your properties file.

You can add a log4j2.component.properties file on the class path (in my case, in the same directory as my log4j.properties file) to set the log4j1.compatibility property, like this:

log4j1.compatibility=true

In our case, it only required setting the compatibility property and then it automatically picked up the log4j.properties file that was available on the class path.