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libraries/TaskScheduler-master/examples/Scheduler_example15_STDFunction/Scheduler_example15_STDFunction.ino

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+/** 
+ * TaskScheduler Test sketch - Showing how to use std::function
+ * to get acces to variables from within the task callback function 
+ * 
+ * Support for std::function is only available for ESP8266 architecture
+ */
+#define _TASK_SLEEP_ON_IDLE_RUN
+#define _TASK_STD_FUNCTION   // Compile with support for std::function 
+#include <TaskScheduler.h>
+
+Scheduler ts;
+int counter = 0;
+
+class Calculator {
+public:
+    int cumSum = 0; // cumulative sum
+    Calculator(int b) {
+        // Pass the this pointer, so that we get access to this->cumSum
+        // Also pass a copy of b
+        calculateTask.set(TASK_SECOND, TASK_FOREVER, [this, b]() {
+            counter++;
+            Serial.printf("%u. %u: cumSum = %u + %u\t", counter, millis(), cumSum, b);
+            cumSum += b;
+            Serial.printf("Resulting cumulative sum: %u\n", cumSum);
+        });
+        ts.addTask(calculateTask);
+        calculateTask.enable();
+    }
+
+    Task calculateTask;
+};
+
+Calculator calc1(2);
+Calculator calc2(4);
+Calculator calc3(8);
+
+// Disable tasks after 10 seconds
+Task tWrapper(10*TASK_SECOND, TASK_ONCE, []() {
+    ts.disableAll();
+}, &ts); 
+
+/**
+ * Standard Arduino setup and loop methods
+ */
+void setup() {
+  Serial.begin(74880);
+  Serial.println("std::function test");
+  tWrapper.enableDelayed();
+}
+
+void loop() {
+  ts.execute();
+}