added c++ expansion example for those interested

expanded.cpp

@@ -0,0 +1,35 @@
+#include <stdio.h>
+
+enum HANDLE_STATE {
+ HANDLE_CREAT,
+ HANDLE_DESTR
+};
+
+struct Vektor {
+ int count;
+ int *v;
+}; struct Vektor_raiicpp; static inline void Vektor_lifetime_handler( enum HANDLE_STATE state, struct Vektor_raiicpp *self, void *data); struct Vektor_raiicpp : public Vektor { inline Vektor_raiicpp(void *data) { Vektor_lifetime_handler(HANDLE_CREAT, this, data); } inline ~Vektor_raiicpp() { Vektor_lifetime_handler(HANDLE_DESTR, this, nullptr); } } static inline void Vektor_lifetime_handler( enum HANDLE_STATE state, struct Vektor_raiicpp *self, void *data) {
+ if(state == HANDLE_CREAT) {
+  self->count = *(int*) data;
+  self->v = calloc(self->count, sizeof(int));
+ } else if (state == HANDLE_DESTR){
+  if(self->v) free(self->v);
+ }
+}
+
+int main() {
+ int n;
+ printf("Number of elements to sum: ");
+ scanf(" %d", &n);
+ Vektor_raiicpp data(&n);;
+
+
+ for(int i = 0; i < data.count; ++i) {
+  scanf(" %d", &n);
+  data.v[i] = n;
+ }
+ n = 0; for(int i = 0; i < data.count; ++i) n += data.v[i];
+ printf("Sum: %d\n", n);
+
+ return 0;
+}