JSON for Modern C++ 3.7.3

Deprecated List

Member nlohmann::basic_json::iterator_wrapper (reference ref) noexcept
  This stream operator is deprecated and will be removed in future 4.0.0 of the library. Please use items() instead; that is, replace `json::iterator_wrapper(j)` with `j.items()`.
Member nlohmann::basic_json::operator>> (const basic_json &j, std::ostream &o)
  This stream operator is deprecated and will be removed in future 4.0.0 of the library. Please use operator<<(std::ostream&, const basic_json&) instead; that is, replace calls like `j >> o;` with `o << j;`.
Member nlohmann::basic_json::operator<< (basic_json &j, std::istream &i)
  This stream operator is deprecated and will be removed in version 4.0.0 of the library. Please use operator>>(std::istream&, basic_json&) instead; that is, replace calls like `j << i;` with `i >> j;`.