C callback table example

callbacks.c

@@ -0,0 +1,31 @@
+/*
+ * Callback table, used for abstracting behaviour. Also known as function
+ * pointer table This is whats caleld a vtable in C++ terms.
+ *
+ * Commonly used as a form of polymorphism
+ */
+
+#include <stdio.h>
+
+static int global = 0;
+
+typedef struct {
+    void (*put)(int);
+    int (*get)();
+} Test;
+
+void my_put(int a) { global = a; }
+int my_get() { return global; }
+
+void executor(Test *t) {
+    t->put(10);
+    int got = t->get();
+
+    printf("Got: %d\n", got);
+}
+
+int main() {
+    Test t = {.get = my_get, .put = my_put};
+    executor(&t);
+    return 0;
+}