In file included from main.cpp:28:0:
fixed_allocator.h: In instantiation of 'FixedAllocator<Tp>::FixedAllocator(uint64_t) [with Tp = int; uint64_t = long unsigned int]':
main.cpp:44:32:   required from here
fixed_allocator.h:9:17: error: 'FixedAllocator<int>::page_size_' will be initialized after [-Werror=reorder]
   std::uint64_t page_size_;
                 ^~~~~~~~~~
fixed_allocator.h:7:17: error:   'PageAllocator FixedAllocator<int>::page_allocator_' [-Werror=reorder]
   PageAllocator page_allocator_;
                 ^~~~~~~~~~~~~~~
fixed_allocator.h:12:12: error:   when initialized here [-Werror=reorder]
   explicit FixedAllocator(std::uint64_t page_size): page_size_(page_size),
            ^~~~~~~~~~~~~~
fixed_allocator.h: In instantiation of 'FixedAllocator<Tp>::FixedAllocator(uint64_t) [with Tp = std::__cxx11::basic_string<char>; uint64_t = long unsigned int]':
main.cpp:55:41:   required from here
fixed_allocator.h:9:17: error: 'FixedAllocator<std::__cxx11::basic_string<char> >::page_size_' will be initialized after [-Werror=reorder]
   std::uint64_t page_size_;
                 ^~~~~~~~~~
fixed_allocator.h:7:17: error:   'PageAllocator FixedAllocator<std::__cxx11::basic_string<char> >::page_allocator_' [-Werror=reorder]
   PageAllocator page_allocator_;
                 ^~~~~~~~~~~~~~~
fixed_allocator.h:12:12: error:   when initialized here [-Werror=reorder]
   explicit FixedAllocator(std::uint64_t page_size): page_size_(page_size),
            ^~~~~~~~~~~~~~
fixed_allocator.h: In instantiation of 'FixedAllocator<Tp>::FixedAllocator(uint64_t) [with Tp = char; uint64_t = long unsigned int]':
main.cpp:116:35:   required from here
fixed_allocator.h:9:17: error: 'FixedAllocator<char>::page_size_' will be initialized after [-Werror=reorder]
   std::uint64_t page_size_;
                 ^~~~~~~~~~
fixed_allocator.h:7:17: error:   'PageAllocator FixedAllocator<char>::page_allocator_' [-Werror=reorder]
   PageAllocator page_allocator_;
                 ^~~~~~~~~~~~~~~
fixed_allocator.h:12:12: error:   when initialized here [-Werror=reorder]
   explicit FixedAllocator(std::uint64_t page_size): page_size_(page_size),
            ^~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors