1 files changed, 25 insertions, 5 deletions
diff --git a/include/sqlite3xx/except.hpp b/include/sqlite3xx/except.hpp
index 2577e85..6a70216 100644
--- a/include/sqlite3xx/except.hpp
+++ b/include/sqlite3xx/except.hpp
@@ -32,20 +32,40 @@ using namespace std;
 
 namespace sqlite3xx {
 
-class SQLITEXX_LIBEXPORT sql_error : runtime_error {
-	string _m;
-	string _q;
+class SQLITEXX_LIBEXPORT sqlitexx_exception {
+	public:
+		virtual ~sqlitexx_exception( ) throw( ) = 0;
+
+		virtual exception &base( ) throw( ) = 0;
+};
+
+class SQLITEXX_LIBEXPORT failure : public sqlitexx_exception, public runtime_error
+{
+	virtual exception &base( ) throw( ) { return *this; }
+
+	public:
+		explicit failure( const string &s );
+};
+
+class SQLITEXX_LIBEXPORT sql_error : public failure {
+	string m_q;
 
 	public:
 		sql_error( );
-		explicit sql_error( string& q );
-		explicit sql_error( string& __m, string& q );
+		explicit sql_error( const string& _q );
+		explicit sql_error( const string& _m, const string& _q );
 		virtual ~sql_error( ) throw( );
 
 		const string& msg( ) const throw( );
 		const string& query( ) const throw( );
 };
 
+/*
+class SQLITEXX_LIBEXPORT db_locked : sql_error {
+	public:
+		explicit db_locket( string &q );
+};
+*/
 }
 
 #endif /* SQLITE3XX_EXCEPT_H */