Using libraries like jsoncpp to serialize my C++ objects and data (e.g. to plot them in Python), I really get tired of all the loops in my code to convert std::vector< double >s into Json::Values. I end up re-typing the same lines again and again. Therefore I'd like to make this a little easier.
I have two use cases: Convert STL types (at least std::vector, std::map) from and to Json::Value, and do this with my own data types as well.
Solution for own data types:
const Json::Value&, the constructor then tries to fill the object with data or throws exceptions if the passed value does not meet specific requirementsoperator Json::Value() as a member function of my class.This way, I should be able to write stuff like that:
MyObj o;
Json::Value root;
root["foo"] = o;
MyObj reconstructed(root["foo"]);
But how should I do this with STL types? Write explicit functions, maybe templates, or should I do the same like for my own data types, except that I use free functions instead of member functions? What is the best practice?
You can write a single function to do that, using for_each.
If you want to support nested containers (vector in vector etc), then you need wrapper functions and call the function recursively, until the input type allows straight conversion to a Json::Value.