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:10:52: error: no matching function for call to 'PageAllocator::PageAllocator()'
   explicit FixedAllocator(std::uint64_t page_size) {
                                                    ^
main.cpp:9:5: note: candidate: PageAllocator::PageAllocator(uint64_t)
     PageAllocator(std::uint64_t page_size) : page_size_(page_size) {
     ^~~~~~~~~~~~~
main.cpp:9:5: note:   candidate expects 1 argument, 0 provided
main.cpp:4:7: note: candidate: PageAllocator::PageAllocator(const PageAllocator&)
 class PageAllocator {
       ^~~~~~~~~~~~~
main.cpp:4:7: note:   candidate expects 1 argument, 0 provided
In file included from main.cpp:28:0:
fixed_allocator.h:11:21: error: use of deleted function 'PageAllocator& PageAllocator::operator=(const PageAllocator&)'
     page_allocator_ = PageAllocator(page_size);
     ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
main.cpp:4:7: note: 'PageAllocator& PageAllocator::operator=(const PageAllocator&)' is implicitly deleted because the default definition would be ill-formed:
 class PageAllocator {
       ^~~~~~~~~~~~~
main.cpp:4:7: error: non-static const member 'const uint64_t PageAllocator::page_size_', can't use default assignment operator
In file included from main.cpp:28:0:
fixed_allocator.h: In instantiation of 'Tp* FixedAllocator<Tp>::Allocate() [with Tp = int]':
main.cpp:45:30:   required from here
fixed_allocator.h:19:38: error: invalid conversion from 'void*' to 'int*' [-fpermissive]
       return page_allocator_.Allocate();
              ~~~~~~~~~~~~~~~~~~~~~~~~^~
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:10:52: error: no matching function for call to 'PageAllocator::PageAllocator()'
   explicit FixedAllocator(std::uint64_t page_size) {
                                                    ^
main.cpp:9:5: note: candidate: PageAllocator::PageAllocator(uint64_t)
     PageAllocator(std::uint64_t page_size) : page_size_(page_size) {
     ^~~~~~~~~~~~~
main.cpp:9:5: note:   candidate expects 1 argument, 0 provided
main.cpp:4:7: note: candidate: PageAllocator::PageAllocator(const PageAllocator&)
 class PageAllocator {
       ^~~~~~~~~~~~~
main.cpp:4:7: note:   candidate expects 1 argument, 0 provided
In file included from main.cpp:28:0:
fixed_allocator.h:11:21: error: use of deleted function 'PageAllocator& PageAllocator::operator=(const PageAllocator&)'
     page_allocator_ = PageAllocator(page_size);
     ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
fixed_allocator.h: In instantiation of 'Tp* FixedAllocator<Tp>::Allocate() [with Tp = std::__cxx11::basic_string<char>]':
main.cpp:57:24:   required from here
fixed_allocator.h:19:38: error: invalid conversion from 'void*' to 'std::__cxx11::basic_string<char>*' [-fpermissive]
       return page_allocator_.Allocate();
              ~~~~~~~~~~~~~~~~~~~~~~~~^~
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:10:52: error: no matching function for call to 'PageAllocator::PageAllocator()'
   explicit FixedAllocator(std::uint64_t page_size) {
                                                    ^
main.cpp:9:5: note: candidate: PageAllocator::PageAllocator(uint64_t)
     PageAllocator(std::uint64_t page_size) : page_size_(page_size) {
     ^~~~~~~~~~~~~
main.cpp:9:5: note:   candidate expects 1 argument, 0 provided
main.cpp:4:7: note: candidate: PageAllocator::PageAllocator(const PageAllocator&)
 class PageAllocator {
       ^~~~~~~~~~~~~
main.cpp:4:7: note:   candidate expects 1 argument, 0 provided
In file included from main.cpp:28:0:
fixed_allocator.h:11:21: error: use of deleted function 'PageAllocator& PageAllocator::operator=(const PageAllocator&)'
     page_allocator_ = PageAllocator(page_size);
     ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
fixed_allocator.h: In instantiation of 'Tp* FixedAllocator<Tp>::Allocate() [with Tp = char]':
main.cpp:119:40:   required from here
fixed_allocator.h:19:38: error: invalid conversion from 'void*' to 'char*' [-fpermissive]
       return page_allocator_.Allocate();
              ~~~~~~~~~~~~~~~~~~~~~~~~^~