error logger headaches

include/amsmathutil25/amsmathutil25.hpp

@@ -25,6 +25,28 @@ static const int amsmathutil25_maxthreads = 50;
 static const int amsmathutil25_threadpsz = 5000;
 
 
+
+//Global Changeable Error Logger //
+//Using accessor pattern
+
+//pointer to function of signature void errorlogger(const char *errmsg, int errcode, void *errglobal);
+extern void (*amsmathutil25_errlogger)(const char *, int, void *);
+extern void* amsmathutil25_errglobal;
+
+typedef void (*amsmathutil25_errloggerptr_t)(const char *, int, void *);
+amsmathutil25_errloggerptr_t amsmathutil25_get_errlogger(); //call this to get the error logger to log errors
+
+// //the other way to do this
+// // return type "pointer to function(const char*, int, void*) returning void"
+// void (*amsmathutil25_get_errlogger(void))(const char *, int, void *);
+// //not exactly clear....
+
+void amsmathutil25_set_errlogger(
+    void(*errloggerpointer)(const char *, int, void *),
+    void* errglobal
+);
+//End Error Logger
+
 };
 
 //Library subsections

src/amsmathutil25/util/amsmathutil25_errorlogger.cpp

@@ -0,0 +1,30 @@
+#include <amsmathutil25/amsmathutil25.hpp>
+
+namespace ams
+{
+
+    void amsmathutil25_default_errlogger(
+        const char *msg,
+        int code,
+        void *)
+    {
+        fprintf(stderr,"%s, %d\n",msg,code);
+        return;
+    }
+
+    amsmathutil25_errloggerptr_t amsmathutil25_get_errlogger()
+    {
+        if(amsmathutil25_errlogger==NULL)
+        {
+            amsmathutil25_errlogger = amsmathutil25_default_errlogger;
+        }
+        return amsmathutil25_errlogger;
+    }
+
+    void amsmathutil25_set_errlogger(void(*errloggerpointer)(const char *, int, void *),void *errglobal)
+    {
+        amsmathutil25_errglobal = errglobal;
+        amsmathutil25_errlogger = errloggerpointer;
+    }
+
+};