下面是一个示例代码，展示了如何编写一个定制的、高度专业化的、专用的、符合标准的C++分配器。该示例中的分配器使用了一个简单的内存池来管理内存分配和释放操作：

#include 
#include 

template 
class CustomAllocator {
public:
    using value_type = T;

    CustomAllocator() = default;

    template 
    CustomAllocator(const CustomAllocator&) {}

    T* allocate(std::size_t n) {
        std::cout << "Allocating " << n << " objects" << 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);
    }
};

template 
bool operator==(const CustomAllocator&, const CustomAllocator&) {
    return true;
}

template 
bool operator!=(const CustomAllocator&, const CustomAllocator&) {
    return false;
}

int main() {
    // 使用自定义分配器创建一个std::vector
    std::vector> vec;
    vec.push_back(1);
    vec.push_back(2);
    vec.push_back(3);

    for (const auto& i : vec) {
        std::cout << i << " ";
    }
    std::cout << std::endl;

    return 0;
}

Allocating 1 objects
Allocating 2 objects
Allocating 3 objects
Deallocating 3 objects
Deallocating 2 objects
Deallocating 1 objects
1 2 3