header-only non-intrusive json serialization in c++

A while ago I’ve started a convenience, zero error-handling, json serializer wrapper around picojson based on the Boost.Serialization and hiberlite APIs. Today the wrapper got even less intrusive for DTOs that expose their members.

Given a class that cannot be extended in its declaration, but the internals are accessible (following to the Boost.Serialization free function API):

struct Untouchable {
    int value;

With a free function defined in the ::picojson::convert namespace,

namespace picojson {
    namespace convert {

        template <class Archive>
        void json(Archive &ar, Untouchable &u) {
            ar &picojson::convert::member("value", u.value);


serialization is “again” possible:

Untouchable example = { 42 };
std::string example_string( picojson::convert::to_string(example) );

Untouchable example_deserialized = { 0 };
picojson::convert::from_string( example_string, example_deserialized );
CHECK( example.value == example_deserialized.value );


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