When Should You Use Custom C Allocators?

Custom C Allocators: When to Utilize Them

Custom allocators, an underappreciated feature of the Standard Library, offer a powerful means to optimize application behavior. While the standard allocator (std::allocator) fulfills most requirements, certain scenarios demand a tailored approach for enhanced performance, correctness, and scalability.

One compelling example is multithreaded applications. Intel TBB utilizes a custom STL allocator that significantly improves performance by allocating objects from thread-private heaps. By simply replacing std::vector with std::vector>, applications can leverage this optimization and boost their efficiency in multithreaded environments.

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