Destroying a pipeline cache

A pipeline cache is not used in any commands recorded in a command buffer. That's why, when we have created all the pipelines we wanted, merged cache data, or retrieved its contents, we can destroy the cache.

How to do it...

1. Store the handle of a logical device in a variable of type VkDevice named logical_device.
2. Take the handle of a pipeline cache object that should be destroyed. Use the handle to initialize a variable of type VkPipelineCache named pipeline_cache.
3. Call vkDestroyPipelineCache( logical_device, pipeline_cache, nullptr ) and provide the logical_device and pipeline_cache variables, and a nullptr value.
4. For safety reasons, store the VK_NULL_HANDLE value in the pipeline_cache variable.

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