Implement more sophisticated readline-mode

luprex/core/cpp/drivertests.cpp

@@ -1,6 +1,5 @@
 #include "drivertests.hpp"
 #include "drivenengine.hpp"
-#include <iostream>
 #include <iomanip>
 
 static void write_closed_message(Channel *ch, StreamBuffer *out) {
@@ -107,17 +106,23 @@ public:
 // This test just prints the time.
 class DriverPrintClockTest : public DrivenEngine {
 public:
-    int count;
+    int count_;
+    double last_clock_;
     virtual void event_init(int argc, char *argv[]) {
-        count = 0;
+        count_ = 0;
+        last_clock_ = 0.0;
     }
     
     virtual void event_update() {
-        std::cerr << std::fixed << std::setprecision(2) << get_clock() << "   ";
-        count++;
-        if (count == 10) {
-            std::cerr << std::endl;
-            count = 0;
+        double clock = get_clock();
+        if (clock > last_clock_ + 0.5) {
+            stdostream() << std::fixed << std::setprecision(2) << clock << "   ";
+            count_++;
+            last_clock_ = clock;
+        }
+        if (count_ == 10) {
+            stdostream() << std::endl;
+            count_ = 0;
         }
     }
 };