Here are the classes, structs, unions and interfaces with brief descriptions:

CVmaAllocation	Represents single memory allocation
CVmaAllocationCreateInfo
CVmaAllocationInfo	Parameters of VmaAllocation objects, that can be retrieved using function vmaGetAllocationInfo()
CVmaAllocator	Represents main object of this library initialized
CVmaAllocatorCreateInfo	Description of a Allocator to be created
CVmaAllocatorInfo	Information about existing VmaAllocator object
CVmaBudget	Statistics of current memory usage and available budget, in bytes, for specific memory heap
CVmaDefragmentationContext	Represents Opaque object that represents started defragmentation process
CVmaDefragmentationInfo	Deprecated. Optional configuration parameters to be passed to function vmaDefragment()
CVmaDefragmentationInfo2	Parameters for defragmentation
CVmaDefragmentationPassInfo	Parameters for incremental defragmentation steps
CVmaDefragmentationPassMoveInfo
CVmaDefragmentationStats	Statistics returned by function vmaDefragment()
CVmaDeviceMemoryCallbacks	Set of callbacks that the library will call for `vkAllocateMemory` and `vkFreeMemory`
CVmaPool	Represents custom memory pool
CVmaPoolCreateInfo	Describes parameter of created VmaPool
CVmaPoolStats	Describes parameter of existing VmaPool
CVmaStatInfo	Calculated statistics of memory usage in entire allocator
CVmaStats	General statistics from current state of Allocator
CVmaVirtualAllocation	Represents single memory allocation done inside VmaVirtualBlock
CVmaVirtualAllocationCreateInfo	Parameters of created virtual allocation to be passed to vmaVirtualAllocate()
CVmaVirtualAllocationInfo	Parameters of an existing virtual allocation, returned by vmaGetVirtualAllocationInfo()
CVmaVirtualBlock	Handle to a virtual block object that allows to use core allocation algorithm without allocating any real GPU memory
CVmaVirtualBlockCreateInfo	Parameters of created VmaVirtualBlock object to be passed to vmaCreateVirtualBlock()
CVmaVulkanFunctions	Pointers to some Vulkan functions - a subset used by the library