Listing 2

class CPrintfArg
{
public:
    typedef enum
    {
        TYP_INT, TYP_UINT, TYP_FLOAT, TYP_CHAR, TYP_C_STRING,
        TYP_STD_STRING, TYP_C_STRING_NONCONST, TYP_STD_STRING_NONCONST,
        TYP_VOIDP, 
    }DATA_TYPES;
    typedef enum
    {
        DELETE_PARM,
        NO_DELETE
    }DELETE_MODE;
    CPrintfArg(const int  x)  : mTyp(TYP_INT) , mDeleteMode(NO_DELETE)
    {                                                        
        v.miVal = x;                                         
    };                                                       
    CPrintfArg(const unsigned int  x) : mTyp(TYP_UINT), mDeleteMode(NO_DELETE)
    {                                                        
        v.muVal = x;                                         
    };                                                       
    CPrintfArg(const void *x) : mTyp(TYP_UINT), mDeleteMode(NO_DELETE)
    {                                                        
        v.muVal = (unsigned int)x;                           
    };                                                       
    CPrintfArg(const long x) : mTyp(TYP_INT) , mDeleteMode(NO_DELETE)
    {                                                        
        v.miVal = x;                                         
    };                                                       
    CPrintfArg(const unsigned long x) : mTyp(TYP_UINT), mDeleteMode(NO_DELETE)
    {                                                        
        v.muVal = x;                                         
    };                                                       
    CPrintfArg(const float x) : mTyp(TYP_FLOAT) , mDeleteMode(NO_DELETE)
    {                                                        
        v.mfVal = (double)x;                                 
    };                                                       
    CPrintfArg(const double x) : mTyp(TYP_FLOAT) , mDeleteMode(NO_DELETE)
    {                                                        
        v.mfVal = x;                                         
    };                                                       
    CPrintfArg(const char c) : mTyp(TYP_CHAR) , mDeleteMode(NO_DELETE)
    {
        v.mChar = c;
    };
    CPrintfArg(const char *p) : mTyp(TYP_C_STRING) , mDeleteMode(NO_DELETE)
    {
        v.mConstCharp = p;
    };
    CPrintfArg(const unsigned char *p) : mTyp(TYP_C_STRING), 
                                              mDeleteMode(NO_DELETE)
    { 
        v.mConstCharp = (const char*)p;
    };
    CPrintfArg(const std::string &s) : mTyp(TYP_STD_STRING), 
                                              mDeleteMode(NO_DELETE)
    {
        v.mConstString = &s;
    };
    // Non cost constructors for objects to delete on destruction
    CPrintfArg(char *p, DELETE_MODE mode = NO_DELETE) : 
                   mTyp(TYP_C_STRING_NONCONST) , mDeleteMode(mode)
    {
        v.mCharp = p;
    };
    CPrintfArg(unsigned char *p, DELETE_MODE mode = NO_DELETE) : 
                   mTyp(TYP_C_STRING_NONCONST) , mDeleteMode(mode)
    {
        v.mCharp = (char*)p;
    };
    CPrintfArg(std::string &s, DELETE_MODE mode = NO_DELETE) : 
                   mTyp(TYP_STD_STRING_NONCONST), mDeleteMode(mode)
    {
        v.mString = &s;
    };
    ~CPrintfArg();
    const std::string Out(const std::string &fmt) const ;
private:
             DATA_TYPES  mTyp;          
             DELETE_MODE mDeleteMode;
             union
             {
                                long   miVal;
                       unsigned long   muVal;
                                double mfVal;
                                char   mChar;
                                char  *mCharp;
                         std::string  *mString;
                 const          char  *mConstCharp;
                 const   std::string  *mConstString;
             }v;
};