git subrepo clone --branch=20.41.6 git@github.com:ETLCPP/etl.git components/etl

subrepo:
  subdir:   "components/etl"
  merged:   "be5537ec"
upstream:
  origin:   "git@github.com:ETLCPP/etl.git"
  branch:   "20.41.6"
  commit:   "be5537ec"
git-subrepo:
  version:  "0.4.9"
  origin:   "???"
  commit:   "???"

components/etl/examples/BlinkList/BlinkList.ino

@@ -0,0 +1,53 @@
+//***********************************************************************************
+// A version of the Blink demo, but with delays stored in two instances of etl::list
+//***********************************************************************************
+
+#undef min
+#undef max
+
+#include <list.h>
+#include <container.h>
+
+void setup()
+{
+  // initialize digital pin 13 as an output.
+  pinMode(13, OUTPUT);
+}
+
+void iterate(const etl::ilist<int>& delays)
+{
+    etl::ilist<int>::const_iterator itr;
+
+    // Iterate through the list.
+    itr = delays.begin();
+
+    while (itr != delays.end())
+    {
+      digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
+      delay(100);               // wait
+      digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
+      delay(*itr++);            // wait
+    }
+}
+
+void loop()
+{
+  int delay_times1[] = { 900, 800, 700, 600, 500, 400, 300, 200, 100 };
+  int delay_times2[] = { 400, 300, 200, 100 };
+
+  // Fill the first delay list, then reverse it.
+  // Notice how we don't have to know the size of the array!
+  const size_t size1 = sizeof(etl::array_size(delay_times1));
+  etl::list<int, size1> delays1(etl::begin(delay_times1), etl::end(delay_times1));
+  delays1.reverse();
+
+  // Fill the second delay list,
+  const size_t size2 = sizeof(etl::array_size(delay_times2));
+  etl::list<int, size2> delays2(etl::begin(delay_times2), etl::end(delay_times2));
+
+  while (true)
+  {
+    iterate(delays1);
+    iterate(delays2);
+  }
+}