How Do You Implement a Custom Allocator in C++?
Custom allocators provide greater control over memory management in C++. They can optimize memory usage.
To implement one, you need to define allocation and deallocation functions. Here’s an example:
template
struct MyAllocator {
T* allocate(std::size_t n) { return static_cast(::operator new(n * sizeof(T))); }
void deallocate(T* p, std::size_t) { ::operator delete(p); }
};
Custom allocators can reduce fragmentation and improve cache performance. They are essential in systems where performance is critical.
Implementing an allocator allows you to fine-tune memory management to fit specific application needs.