Function make_checked

extlibs/fmt/include/fmt/format.h:342–344

// Make a checked iterator to avoid MSVC warnings.
template <typename T> using checked_ptr = stdext::checked_array_iterator<T*>;
template <typename T> checked_ptr<T> make_checked(T* p, std::size_t size) {
  return {p, size};
}
#else
template <typename T> using checked_ptr = T*;
template <typename T> inline T* make_checked(T* p, std::size_t) { return p; }