[serialization] serialization of an ifstream/ofstream class member

Pablo Madoery

28 Mar 2014 28 Mar '14

1:09 p.m.

Hi. Do You know if there is a way to serialize an ifstream/ofstream class member. I have this class for example class Object { public: Object(); Object(string name); virtual ~Object(); string getName() const; private: string name_; ifstream file_; friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & name_; ar & file_; } }; when I try to serialize it throw compilation error : error: 'struct std::basic_ifstream<char>' has no member named 'serialize'. Is there a specific header i must include ?

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Nat Goodspeed

28 Mar 28 Mar

1:51 p.m.

New subject: [serialization] serialization of an ifstream/ofstream class member

On Fri, Mar 28, 2014 at 9:09 AM, Pablo Madoery wrote:

...

string name_; ifstream file_;

friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & name_; ar & file_; }

when I try to serialize it throw compilation error : error: 'struct std::basic_ifstream<char>' has no member named 'serialize'.

Is there a specific header i must include ?

May I ask what you intend to accomplish? A frequent use case for serializing memory data is to write it to the local filesystem. Presumably your ifstream represents a file that already exists on the filesystem. Maybe you want to record the file's name? Perhaps you want to record the current offset within that file? If so, I would serialize those things specifically.

Pablo Madoery

2:06 p.m.

New subject: [serialization] serialization of an ifstream/ofstream class member

That's what i was thinking about. I Have a file in the filesystem that i am reading and I would like to record the position I stop reading before I record the object that reads the file, so when I de-serialize that object I could use it and continue reading the same file in the recorded position. How Do you think i can deal with this situation ? Thank you On Fri, Mar 28, 2014 at 10:51 AM, Nat Goodspeed wrote:

...

On Fri, Mar 28, 2014 at 9:09 AM, Pablo Madoery wrote:

...
string name_; ifstream file_;

friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & name_; ar & file_; }

when I try to serialize it throw compilation error : error: 'struct std::basic_ifstream<char>' has no member named 'serialize'.

Is there a specific header i must include ?

May I ask what you intend to accomplish? A frequent use case for serializing memory data is to write it to the local filesystem. Presumably your ifstream represents a file that already exists on the filesystem. Maybe you want to record the file's name? Perhaps you want to record the current offset within that file? If so, I would serialize those things specifically. _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

Krzysztof Czainski

2:31 p.m.

New subject: [serialization] serialization of an ifstream/ofstream class member

{reordered the message chronologically} 2014-03-28 15:06 GMT+01:00 Pablo Madoery :

...

On Fri, Mar 28, 2014 at 10:51 AM, Nat Goodspeed wrote:

...
On Fri, Mar 28, 2014 at 9:09 AM, Pablo Madoery wrote:

...
string name_; ifstream file_;

friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & name_; ar & file_; }

when I try to serialize it throw compilation error : error: 'struct std::basic_ifstream<char>' has no member named 'serialize'.

Is there a specific header i must include ?

May I ask what you intend to accomplish? A frequent use case for serializing memory data is to write it to the local filesystem. Presumably your ifstream represents a file that already exists on the filesystem. Maybe you want to record the file's name? Perhaps you want to record the current offset within that file? If so, I would serialize those things specifically.

...

That's what i was thinking about. I Have a file in the filesystem that i am reading and I would like to record the position I stop reading before I record the object that reads the file, so when I de-serialize that object I could use it and continue reading the same file in the recorded position. How Do you think i can deal with this situation ? Thank you

Hint: how would you write a copy constructor for your class? HTH, Kris

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Krzysztof Czainski
Nat Goodspeed
Pablo Madoery