// something.h

typedef struct {

    char* something;
    char* somethingElse;
} someStruct;

class someClass {

    public:

    someClass( void );
    ~someClass( void );
    char* getSomething( void );

    private:

    someStruct* sS;
};

// something.cpp

#include "something.h"

char* someClass::getSomething( void )
{   printf( "%d\n", sizeof( sS ) );
}