adl_serializer::from_json - how to handle a case where I can't properly parse json value?

[TrueWodzu]

Hi guys,

I've started using adl_serializer for custom conversion to and from json. It works good, however the problem I am facing is that I would like to throw an exception in case the conversion is not possible. But adl_serializer seems to be expecting noexcept member functions, so after throwing exception - terminate() is being called.

An example:

	template<>
	struct adl_serializer<MyType>
	{
		static void to_json(json& j, const MyType& t)
		{
			// Convert
		}

		static void from_json(const json& j, MyType& t)
		{
			std::string s = j.get<std::string>();
                        if (!ConvertJtoT(j, t)
				throw std::invalid_argument("Unable to convert j to t);
		}
	};

How to handle a use case where conversion is not possible?

[TrueWodzu]

Or maybe the problem lies here:

auto j = R"({"MyType" : "25.5"})"_json;
auto v = j.at("MyType").get<MyType>(); // This calls from_json.

[TrueWodzu]

Sorry, it was my fault, did not handle exception properly in my function chain.