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Implement a vector utility that uses a custom allocator

Matteo Franchin requested to merge matteo.franchin.arm/vulkan-wsi-layer:custom_allocator into master

Add util::vector to provide functionality similar to std::vector, i.e. growable arrays. util::vector does its allocations via a custom allocator provided via VkAllocationCallbacks and provides methods to check whether the allocation fails, e.g. try_push_back() returns false when the allocation fails and replaces std::vector's push_back() method that would rather raise an exception to report an allocation failure.

Note that this commit switches on exceptions in the layer by removing the flag -fno-exceptions.

util::vector is also used to store swapchain images.

Change-Id: I2bf2b24bd06e198c198c4f4aedd8f7fced96a346 Signed-off-by: Joe Jenner-Bailey joe.jenner-bailey@arm.com Signed-off-by: Matteo Franchin matteo.franchin@arm.com

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