nlohmannJsonExtension.h

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#pragma once
#include <optional>
 
#include <nlohmann/json.hpp>
 
#define NLOHMANN_JSON_FROM_NON_THROWING(v1) \
    if (nlohmann_json_j.contains(#v1)) nlohmann_json_j.at(#v1).get_to(nlohmann_json_t.v1);
#define NLOHMANN_DEFINE_TYPE_INTRUSIVE_NON_THROWING(Type, ...)                                                                                                     \
    friend void to_json(nlohmann::json& nlohmann_json_j, const Type& nlohmann_json_t) { NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_TO, __VA_ARGS__)) } \
    friend void from_json(const nlohmann::json& nlohmann_json_j, Type& nlohmann_json_t) { NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_FROM_NON_THROWING, __VA_ARGS__)) }
 
#define NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_NON_THROWING(Type, ...)                                                                                                 \
    inline void to_json(nlohmann::json& nlohmann_json_j, const Type& nlohmann_json_t) { NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_TO, __VA_ARGS__)) } \
    inline void from_json(const nlohmann::json& nlohmann_json_j, Type& nlohmann_json_t) { NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_FROM_NON_THROWING, __VA_ARGS__)) }
 
 
// add support for std::optional (3.11.3), previously used code removed
template<typename T>
struct nlohmann::adl_serializer<std::optional<T>> {
    static void to_json(nlohmann::json& j, const std::optional<T>& v) {
        if (v.has_value()) {
            j = v.value();
        } else {
            j = nullptr;
        }
    }
    static void from_json(const nlohmann::json& j, std::optional<T>& v) {
        if(j.is_null()) {
            v = std::nullopt;
        } else {
            v = j.get<T>();
        }
    }
};