safe_serial.h

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#ifndef DATATOOLS_SAFE_SERIAL_H
#define DATATOOLS_SAFE_SERIAL_H

// Standard Library:
#include <list>
#include <stdexcept>

// This project:
#include <datatools/exception.h>

namespace datatools {

  template<class T>
  class safe_serial
  {
  public:
    typedef T data_type;

    safe_serial() : data_()
    {
      last_ = data_.rend();
    }

    virtual ~safe_serial()
    {
      this->clear();
    }

    void clear()
    {
      data_.clear();
      last_ = data_.rend();
    }

    bool empty() const
    {
      return data_.size() == 0;
    }

    const data_type & get() const
    {
      DT_THROW_IF (this->empty(), std::logic_error, "No data!");
      return *(last_);
    }

    // /// \deprecated Return a mutable reference to the current object
    // data_type& get() {
    //   DT_THROW_IF (this->empty(), std::logic_error, "No data!");
    //   return *(last_);
    // }

    data_type & grab()
    {
      DT_THROW_IF (this->empty(), std::logic_error, "No data!");
      return *(last_);
    }

    void make()
    {
      try {
        data_.push_back(data_type());
      }
      catch (...) {
        DT_THROW_IF(true, std::logic_error, "Cannot insert new data element!");
      }
      last_ = data_.rbegin();
    }

    void set(const data_type & data)
    {
      this->make();
      this->get() = data;
    }

  private:

    typename std::list<T>                   data_; 
    typename std::list<T>::reverse_iterator last_; 

  };

} // end of namespace datatools

#endif // DATATOOLS_SAFE_SERIAL_H

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