SQLErrMsg.h

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#ifndef art_Framework_IO_Root_RootDB_SQLErrMsg_h
#define art_Framework_IO_Root_RootDB_SQLErrMsg_h

// Little class to handle the management of an SQLite3 error message.

// Pass an instance of this class to an SQLite3 function expecting a
// char** into which to place an error message.

#include <string>

namespace art {
  class SQLErrMsg;
}

class art::SQLErrMsg {
public:
  SQLErrMsg() : errMsg_(nullptr) {}
  ~SQLErrMsg();

  // Return the stored message.
  std::string
  msg() const
  {
    return errMsg_;
  }

  // Throw a suitable message if an error occurred.
  void throwIfError();

  // Reset and release memory. This will be done automatically in the
  // destructor anyway.
  void reset();

  // Enable an object of this class to be passed to functions expecting
  // char **.
  operator char**()
  {
    reset();
    return &errMsg_;
  }

private:
  char* errMsg_;
};

#endif /* art_Framework_IO_Root_RootDB_SQLErrMsg_h */

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