A little special serialize method

test.cpp

// g++ -I/path/to/include -L/path/to/lib -lpficommon test.cpp                                                                                                                                            

#include <stdint.h>
#include <pficommon/text/json.h>
#include <pficommon/data/serialization.h>

struct Widget {
  explicit Widget(int64_t value) : value_(value) {}

  int64_t value_;

private:
  friend class pfi::data::serialization::access;
  template<typename Archive>
  void serialize(Archive& ar) {
    if (!ar.is_read) {
      pfi::text::json::json js(new pfi::text::json::json_integer(value_));
      // using namespace pfi::text::json; serialize(ar, js); // compilation error                                                                                                                        
      pfi::text::json::serialize(ar, js); // compilation succeed                                                                                                                                         
    }
  }
};

int main()
{
  Widget widget(4);
  std::cout << pfi::text::json::to_json(widget) << std::endl;
  return 0;
}

Compiler cannot find template <> inline void pfi::text::json::serialize(json& js, json& ks) when using "using namespace pfi::text::json; serialize(ar, js);".