How do I implement custom allocators for embedded systems?

Implementing custom allocators in C++ for embedded systems can significantly enhance memory management by tailoring the allocation mechanisms to the specific needs and constraints of the system. Custom allocators can help minimize fragmentation, improve allocation speed, and optimize memory usage.

Custom Allocator Example

The following example demonstrates how to create a simple custom allocator in C++:

#include #include template class CustomAllocator { public: using value_type = T; CustomAllocator() = default; template CustomAllocator(const CustomAllocator&) {} T* allocate(std::size_t n) { if (n > std::size_t(-1) / sizeof(T)) { throw std::bad_alloc(); } if (auto p = std::malloc(n * sizeof(T))) { return static_cast(p); } throw std::bad_alloc(); } void deallocate(T* p, std::size_t) noexcept { std::free(p); } }; int main() { std::allocator_traits>::allocate(CustomAllocator(), 5); return 0; }

custom allocators embedded systems C++ memory management memory optimization code efficiency

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