From 6da0ceb35d88a326b567ab40c5206eeb5289602c Mon Sep 17 00:00:00 2001
From: Roland Conybeare <rconybeare@gmail.com>
Date: Mon, 9 Oct 2023 16:57:05 -0400
Subject: [PATCH] subsys: + operator<< for InitEvidence

---
 include/xo/subsys/Subsystem.hpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/xo/subsys/Subsystem.hpp b/include/xo/subsys/Subsystem.hpp
index ece72db6..3cc6012a 100644
--- a/include/xo/subsys/Subsystem.hpp
+++ b/include/xo/subsys/Subsystem.hpp
@@ -6,6 +6,7 @@
 #pragma once
 
 #include "xo/indentlog/scope.hpp"
+#include <iostream>
 #include <functional>
 #include <list>
 #include <string_view>
@@ -57,6 +58,12 @@ namespace xo {
         std::uint64_t evidence_ = 0;
     }; /*InitEvidence*/
 
+    inline std::ostream &
+    operator<<(std::ostream & os, InitEvidence x) {
+        os << "<init-evidence " << x.evidence() << ">";
+        return os;
+    } /*operator<<*/
+
     /* Goals:
      * 1. provide for code that must run once (and only once)
      *    to initialize subsystems