+ explicit InvalidSignerError (std::string reason);
+};
+
+
+class ProgrammingError : public std::runtime_error
+{
+public:
+ ProgrammingError (std::string file, int line, std::string message = "");
+};
+
+
+class TextEncodingError : public std::runtime_error
+{
+public:
+ explicit TextEncodingError (std::string s)
+ : std::runtime_error (s)
+ {}
+};
+
+
+class MetadataError : public std::runtime_error
+{
+public:
+ explicit MetadataError (std::string s)
+ : std::runtime_error (s)
+ {}
+};
+
+
+class OldFormatError : public std::runtime_error
+{
+public:
+ explicit OldFormatError (std::string s)
+ : std::runtime_error (s)
+ {}