using g++ 7.3.0 错误：call to non-constexpr function ->frame_i.image.get()

[Jimsysu]

/Project/vig-init/ext/slamtools/include/slamtools/frame.h:80:56: 错误：call to non-constexpr function ‘std::__shared_ptr<_Tp, _Lp>::element_type* std::__shared_ptr<_Tp, _Lp>::get() const [with _Tp = Image; __gnu_cxx::_Lock_policy _Lp = (__gnu_cxx::_Lock_policy)2; std::__shared_ptr<_Tp, _Lp>::element_type = Image]’
return Comparator<Image *>()(frame_i.image.get(), frame_j.image.get());

[Once245]

hi,i also meet this problem,can you give some advice ,thanks!