C++ warning: cannot pass objects of non-POD type

I know this is not uncommon error but in this case, do not see a problem. Can someone help identify the problem. The OS is CentOs 5 wit g++ 4.1.
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//Warning 1 on line 4 - warning: cannot pass objects of non-POD type ‘StdString<char, std::char_traits<char>, std::allocator<char> > ’ through ‘...’; call will abort at runtime
//Warning 2 on line 8 - warning: cannot pass objects of non-POD type ‘class stdStdString<char, std::char_traits<char>, std::allocator<char> >’ through ‘...’; call will abort at runtime


///////////////////////////////////////////////
1)try {
2)   xxx.ParseFile(z_FileName.c_str());
3)}
// Warning 1 here
4)catch(ZZZ_Exception &except) {  
5)         printf("%s File error : %s\n", m_pPrefix, except.what());
6)         return false;
7)}
// Warning 2 here
8)catch(...) {
9)         printf("%s File error : Unknown Parse File Exception\n", m_pPrefix);
10)         return false;
11)}
----------------------------------------------------------------------------------------

12)class ZZZ_Exception : public std::exception
13){
14)      StdStringChar   _what;
15)      int            m_nCode;
16)public:
17)      ZZZ_Exception    (const StdStringChar &what_arg, int nCode=0): _what (what_arg), m_nCode(nCode) {}
18)      virtual const  char *what              () const throw()         { return _what.c_str();}
19)      virtual        int   code              () const throw()         { return(m_nCode);}
20)        ~ZZZ_Exception() throw() {}
21)};
---------------------------------------------------------------------------------------
typedef StdString<char, std::char_traits<char>, std::allocator<char> >            StdStringChar;
1240Asked:
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jkrCommented:
What type does 'm_pPrefix' have? If that is not a 'char*' or any other POD type, this would cause the error, since you can't pass these to 'printf()'.
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1240Author Commented:
Thanks for the help, this was a good solution.
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jkrCommented:
I *am* curious, what type was it of?
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AxterCommented:
FYI:
If it's an std::string type, you can still use it with printf, but you have to pass it via .c_str().
Example:
printf("%s File error : %s\n", m_pPrefix.c_str(), except.what().c_str());

But (in general) it's could practice to use std::out with STL objects instead of printf.
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1240Author Commented:
I added an access method and returned the c_str() from the method. Was looking in the Exception class for the problem and did see this issue. Thanks
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