Question

I have a std::vector<int> and I want serialize it. For this purpose I am trying to use a std::stringstream

 vector<int> v;
 v.resize(10);
 for (int i=0;i<10;i++)
 v[i]=i;


 stringstream ss (stringstream::in | stringstream::out |stringstream::binary);

However when I copy the vector to the stringstream this copy it as character

ostream_iterator<int> it(ss);
copy(v.begin(),v.end(),it);

the value that inserted to buffer(_Strbuf) is “123456789”

I sucssesed to write a workaround solution

for (int i=1;i<10;i++)
   ss.write((char*)&p[i],sizeof(int));

I want to do it something like first way by using std function like copy

thanks Herzl

Answer 1

Actually, this is your workaround but it may be used with std::copy() algorithm.

   template<class T>
   struct serialize
   {
      serialize(const T & i_value) : value(i_value) {}
      T value;
   };

   template<class T>
   ostream& operator <<(ostream &os, const serialize<T> & obj)
   {
      os.write((char*)&obj.value,sizeof(T));
      return os;
   }

Usage

ostream_iterator<serialize<int> > it(ss);
copy(v.begin(),v.end(),it);