if a commodity price cannot be downloaded, report it as an error

1 files changed, 12 insertions, 0 deletions

diff --git a/option.h b/option.h
index 49f228cd..2e4d7599 100644
--- a/option.h
+++ b/option.h
@@ -3,6 +3,7 @@
 
 #include <list>
 #include <string>
+#include <exception>
 
 struct option_handler {
   bool handled;
@@ -19,6 +20,17 @@ struct option_t {
   option_t() : short_opt(0), wants_arg(false), handler(NULL) {}
 };
 
+class option_error : public std::exception {
+  std::string reason;
+ public:
+  option_error(const std::string& _reason) throw() : reason(_reason) {}
+  virtual ~option_error() throw() {}
+
+  virtual const char* what() const throw() {
+    return reason.c_str();
+  }
+};
+
 void add_option_handler(std::list<option_t>& options, const std::string& label,
 			const std::string& opt_chars, option_handler& option);
 bool process_option(std::list<option_t>& options,