Add 'xo-printjson/' from commit '6743b9ef18'

git-subtree-dir: xo-printjson
git-subtree-mainline: d49c309f80
git-subtree-split: 6743b9ef18

xo-printjson/src/printjson/init_printjson.cpp

@@ -0,0 +1,36 @@
+/* file init_printjson.cpp
+ *
+ * author: Roland Conybeare, Sep 2022
+ */
+
+#include "init_printjson.hpp"
+#include "PrintJson.hpp"
+#include "xo/reflect/init_reflect.hpp"
+#include "xo/subsys/Subsystem.hpp"
+
+namespace xo {
+    using xo::json::PrintJsonSingleton;
+
+    void
+    InitSubsys<S_printjson_tag>::init()
+    {
+        /* create singleton */
+        PrintJsonSingleton::instance();
+    } /*init*/
+
+    InitEvidence
+    InitSubsys<S_printjson_tag>::require()
+    {
+        InitEvidence retval;
+
+        /* subsystem dependencies for printjson/ */
+        retval ^= InitSubsys<S_reflect_tag>::require();
+
+        /* printjson/'s own initialization code */
+        retval ^= Subsystem::provide<S_printjson_tag>("printjson", &init);
+
+        return retval;
+    } /*require*/
+} /*namespace xo*/
+
+/* end init_printjson.cpp */