some fixes for c<->cpp

Author: ipelupessy

src/amuse/community/arepo/interface.cc

@@ -1,12 +1,17 @@
+#include <cstdio>
+#include <cstring>
+
 #ifndef NOMPI
 #include <mpi.h>
 #endif
 
+#include "interface.h"
 #include "worker_code.h"
 
-
 // general interface functions:
 
+using namespace std;
+
 void set_default_parameters(){
   // Relevant files
   strcpy(All.InitCondFile, "./snap_010");

src/amuse/community/arepo/interface.h

@@ -1,10 +1,13 @@
 #ifdef __cplusplus
 extern "C" {
+#define ___cplusplus
+#undef __cplusplus
 #endif
 
 #include "src/main/allvars.h"
 #include "src/main/proto.h"
 
-#ifdef __cplusplus
+#ifdef ___cplusplus
 }
+#define __cplusplus
 #endif