It's a templated method which is meant to be specialized. The base version
is never called. Just remove 'inline' to make GCC shut up.
* a compiler complain is the result.
* @param dest Destination value to be written
* @param db File database, including input stream. */
- template <typename T> inline void Convert (T& dest, const FileDatabase& db) const;
+ template <typename T> void Convert (T& dest, const FileDatabase& db) const;
// --------------------------------------------------------
// generic converter