Make interface_read_error printable

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/interface_read_error.hpp b/src/interface_read_error.hpp
index 3c52178..beae472 100644
--- a/src/interface_read_error.hpp
+++ b/src/interface_read_error.hpp
@@ -2,11 +2,16 @@
 #define GETIF_INTERFACE_READ_ERROR_H
 
 #include <string>
+#include <iostream>
 
 class interface_read_error {
     public:
         interface_read_error(std::string msg);
 
+        friend auto operator<<(std::ostream& os, interface_read_error const& ire) -> std::ostream& {
+            return os << "Interface read error: " << ire.errmsg;
+        };
+
     private:
         std::string errmsg;
 };