danoman

Return pointer to array of 4 integers:

  int32_t (* bar(void))[4] {
      static int32_t u[4] = {1, 0, 1, 0};
      return &u;
  }

Return a pointer to a function taking a char:

  void f(char a) {
      // ...
  }

  void (* baz(void))(char) {
      return f;
  }

Beware of struct padding.

sizeof(b.arr) != sizeof(b)

Consider:

  #include <stddef.h>

  #include <inttypes.h>

  typedef struct Array Array;

  struct Array {
      int32_t data[8];
  };

  void foo(Array const* arr) {
      size_t sz = sizeof(arr->data);
  }