Re: std::exception what() method

Hi,

I have the following exception class:

#include <string>
#include <exception>
class tcClockSynchException : public std::exception
{
public:
 explicit tcClockSynchException(const char *apnMsg) : mcMsg(apnMsg) {}
  virtual const char *what() const throw() { return mcMsg.c_str(); }
   virtual ~tcClockSynchException() throw() {}
private:
   std::string mcMsg;
};

I'm a little worried about the what() method. It isn't clear to me
whether or not I can rely on c_str() to not throw any exceptions,
since the what() method in the base class says it will not throw any
exceptions. Does the standard guarantee that c_str() will not throw
any exceptions? If it doesn't guarantee this what is a better way to
implement my exception class?