Wierd POD type error

teval · 08-18-2003, 05:17 PM

../Source/Game/Fleet.cpp: In member function `const bool Fleet::Save(FILE*)':
../Source/Game/Fleet.cpp:82: warning: cannot pass objects of non-POD type `
const struct std::string' through `...'; call will abort at runtime

I have no clue what a POD type struct is or a `...' call.
I'm asumming the ... call is the %-substitution in printf()
I might be wrong..

Code:

const bool Fleet::Save( FILE *fd )
{
        fprintf( fd ,
                                "\n[%s-Fleet_%s]\n"
                      "posx = %f\n"
                                "posy = %f\n"
                                "origin = %s\n"
                      "destx = %f\n"
                                "desty = %f\n"
        , species.c_str() , name.c_str() , position.x , position.y , origin.c_str() , dest.x , dest.y );
        if( !destination.empty() )
                fprintf( fd , "destination = %s\n" , destination.c_str() );

        int     i = 0;
        for( vector<Vessel *>::iterator it = begin() ; it != end() ; ++it )
                for( int j = 0 ; j < (*it)->GetCount() ; j++ )
                        fprintf( fd , "%d = %s\n" , i++ , (*it)->vesselClass ); //LINE 82 with the error

        return true;
}

Any clue what's happining?
I can provide any part of the code..and if you want you can get it from sourceforge.. Borqueror is GPLed (I'm porting it back to Linux, even though it's supposed to work)

Thanks

lyle_s · 08-18-2003, 06:32 PM

POD stands for Plain Old Data. A POD type is a type that makes no use of special C++ features (features beyond C features). For example, a class is not a POD type because it can use inheritance, virtual functions, etc. An example of a POD type is int.

The signature for fprintf is

Code:

int fprintf(FILE *stream, const char *format, ...);

You're trying to pass a string through the "..." there.

You could try changing line 82 to

Code:

fprintf( fd , "%d = %s\n" , i++ , (*it)->vesselClass.c_str());

It seemed to work on the line above.

Lyle