<ul data-eligibleForWebStory="true"><li>Taking a heaptrack memory profile of the default allocator revealed 2,000,000 heap allocations when adding, deleting, and re-adding 1,000,000 entries to an std::unordered_map.</li><li>To avoid heap allocations in the application's hot path, the solution proposed involves using a memory pool in conjunction with a custom allocator.</li><li>The custom allocator's implementation includes functions allocate() and deallocate(), complying with std::allocator_traits for proper interfacing with the standard library.</li><li>By implementing the custom allocator and utilizing a memory pool, transitioning from heap to stack memory allocation was successful, as observed in the heaptrack memory profile.</li></ul>

Custom Allocators, Memory Pools, And std::unordered_map

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