Why is this error? C++ stringstream instance?

I am creating this wrapper class:
When I compile this it keep on telling me that there is an error in the mDataStream object definition in the .h file. I do not understand why. I have seen several examples on th enet and I do not see a problem. Can someobe tell me why?

//BinaryStream.h

#ifndef BinaryStream_EXISTS
#define BinaryStream_EXISTS

#include <string>
#include <sstream>

class BinaryStream;

namespace Wrsp
{
    class BinaryStream
    {
        public:
          void read(char *, int);
          void write(const char*, int);
 
          void operator<<(const char* );
          void operator>>(char* );  
        private:
           std::stringstream mDataStream(std::stringstream::in | std::stringstream::out | std::stringstream::binary);
    };
}


//BinaryStream.cpp
#include "BinaryStream.h"

namespace Wrsp
{
    void BinaryStream::read(char* buffer, int buffersize)
    {
        mDataStream.read(buffer, buffersize);
    }


    void BinaryStream::write(const char* buffer, int buffersize)
    {
        mDataStream.write(buffer, buffersize);
    }


    void BinaryStream::operator<<(const char* inChar )
    {
        write(inChar, 1);
    }
     

    void BinaryStream::operator>>(char* inChar)
    {  
        read(inChar, 1);
    }  
}
prainAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

ZoppoCommented:
Hi prain,

the problem is simply that it's not possible to initialize (none-const and none-static) members within the class declaration. You have to move it to the constructor, i.e.:
namespace Wrsp
{
    class BinaryStream
    {
        public:
          BinaryStream();

          void read(char *, int);
          void write(const char*, int);
 
          void operator<<(const char* );
          void operator>>(char* );  
        private:
           std::stringstream mDataStream;
    };
}

namespace Wrsp
{
    BinaryStream::BinaryStream()
    : mDataStream( std::stringstream::in | std::stringstream::out | std::stringstream::binary )
    {
    }
...
}

Open in new window

Hope that helps,

ZOPPO
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
prainAuthor Commented:
Great. Thank you very much.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
C++

From novice to tech pro — start learning today.