-class unknown_keyword: public runtime_error
-{
-public:
- unknown_keyword(const std::string &k):
- runtime_error(k)
- { }
-
- virtual ~unknown_keyword() throw() { }
-};
-
-
-class invalid_signature: public runtime_error
-{
-public:
- invalid_signature(const std::string &k, const std::string &s):
- runtime_error(format("%s %s", k, s))
- { }
-
- virtual ~invalid_signature() throw() { }
-};
-
-