cpp-json/include/json/binder/json_pointer_binder.hpp

//
//  json_pointer_binder.hpp
//  json
//
//  Created by Sam Jaffe on 11/15/18.
//  Copyright © 2018 Sam Jaffe. All rights reserved.
//

#pragma once

#include "json_binder.hpp"

namespace json { namespace binder {
  template <typename P> class pointer_binder : public binder_impl<P> {
    // Maybe a reference type
    using Tr = decltype(*std::declval<P>());
    using T = typename std::remove_reference<Tr>::type;

  public:
    pointer_binder(binder<T> impl) : m_impl(impl) {}

    virtual binder_impl<P> * clone() const { return new pointer_binder(*this); }

    virtual void parse(P & v, char const *& data, parser::options opts) const {
      if (!strncmp(data, "null", 4))
        v = nullptr;
      else
        m_impl.parse(*(v = P(new T)), data, opts);
    }

    void write(P const & v, std::ostream & os) const {
      if (v)
        m_impl.write(*v, os);
      else
        os << "null";
    }

  private:
    binder<T> m_impl;
  };
}}