How do I use polymorphic_allocator with containers for financial apps?

In financial applications, efficient memory management is critical for performance, especially when dealing with large datasets. The polymorphic_allocator in C++ provides a flexible memory allocation strategy that can be especially useful when working with standard containers such as vectors, lists, and maps. By using polymorphic_allocator, developers can take advantage of custom allocators while maintaining compatibility with the Standard Template Library (STL).

Example Usage: #include #include #include // Custom allocator using polymorphic_allocator template struct CustomAllocator { using value_type = T; CustomAllocator() = default; template CustomAllocator(const CustomAllocator&) {} T* allocate(std::size_t n) { std::cout << "Allocating " << n << " objects of size " << sizeof(T) << std::endl; return static_cast(::operator new(n * sizeof(T))); } void deallocate(T* p, std::size_t n) { std::cout << "Deallocating " << n << " objects" << std::endl; ::operator delete(p); } }; int main() { std::vector> myVector; myVector.push_back(1); myVector.push_back(2); myVector.push_back(3); for (auto& value : myVector) { std::cout << value << " "; } return 0; }

polymorphic_allocator financial applications C++ memory management custom allocators STL compatibility performance optimization

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