init_printjson: always create singleton

src/printjson/init_printjson.cpp

@@ -4,29 +4,33 @@
  */
 
 #include "init_printjson.hpp"
+#include "PrintJson.hpp"
 #include "xo/reflect/init_reflect.hpp"
 #include "xo/subsys/Subsystem.hpp"
 
 namespace xo {
-  void
-  InitSubsys<S_printjson_tag>::init()
-  {
-    /* placeholder -- expecting there to be non-trivial content soon */
-  } /*init*/
+    using xo::json::PrintJsonSingleton;
 
-  InitEvidence
-  InitSubsys<S_printjson_tag>::require()
-  {
-    InitEvidence retval;
+    void
+    InitSubsys<S_printjson_tag>::init()
+    {
+        /* create singleton */
+        PrintJsonSingleton::instance();
+    } /*init*/
 
-    /* subsystem dependencies for printjson/ */
-    retval ^= InitSubsys<S_reflect_tag>::require();
+    InitEvidence
+    InitSubsys<S_printjson_tag>::require()
+    {
+        InitEvidence retval;
 
-    /* printjson/'s own initialization code */
-    retval ^= Subsystem::provide<S_printjson_tag>("printjson", &init);
+        /* subsystem dependencies for printjson/ */
+        retval ^= InitSubsys<S_reflect_tag>::require();
 
-    return retval;
-  } /*require*/
+        /* printjson/'s own initialization code */
+        retval ^= Subsystem::provide<S_printjson_tag>("printjson", &init);
+
+        return retval;
+    } /*require*/
 } /*namespace xo*/
 
 /* end init_printjson.cpp */