Added empty

src/dyn_arr.c

@@ -19,6 +19,13 @@ void *dyn_arr_init(size_t item_size, size_t capacity) {
   return dyna_ptr;
 }
 
+bool dyna_empty(void *array) {
+  if (dyna_length(array) == 0) {
+    return false;
+  }
+  return true;
+}
+
 void *dyna_ensure_capacity(void *array, size_t item_count, size_t item_size) {
   dyna_header *header = dyna_get_header(array);
   size_t minimum_capacity = header->length + item_count;

src/dyn_arr.h

@@ -1,14 +1,29 @@
 #pragma once
 
 #include <stdlib.h>
+#include <stdbool.h>
 
 #define ARRAY_INITIAL_CAPACITY 4
 
+/* TODO:
+ * Functions to implement to match what I want:
+ * - Capacity
+ *   - shrink capacity to size
+ * - Modifiers
+ *   - clear
+ *   - insert
+ *   - (optional) insert range
+ *   - pop
+ *   - (optional) swap
+ *   - (optional) resize
+*/
+
 typedef struct dyna_header {
   size_t capacity;
   size_t length;
 } dyna_header;
 
+// Initialisation
 #define dyna_init(T) (T *)dyn_arr_init(sizeof(T), ARRAY_INITIAL_CAPACITY)
 void *dyn_arr_init(size_t item_size, size_t capacity);
 
@@ -17,8 +32,9 @@ void *dyn_arr_init(size_t item_size, size_t capacity);
    (array)[dyna_get_header(array)->length] = (value),                          \
    &(array)[dyna_get_header(array)->length++])
 
+// Get meta data
 #define dyna_get_header(array) ((dyna_header *)(array)-1)
-#define dyna_length(array) (array_header(array)->length)
-#define dyna_capacity(array) (array_header(array)->capacity)
-
+#define dyna_length(array) (dyna_get_header(array)->length)
+#define dyna_capacity(array) (dyna_get_header(array)->capacity)
+bool dyna_empty(void* array);
 void *dyna_ensure_capacity(void *array, size_t item_count, size_t item_size);

src/main.c

@@ -4,11 +4,13 @@
 
 int main() {
   int *dyna_array = dyna_init(int);
+  printf("empty %d\n", dyna_empty(dyna_array));
 
   for (int i = 0; i < 999999999; i++) {
     dyna_append(dyna_array, i);
   }
-    printf("capacity %zu\n",  dyna_get_header(dyna_array)->capacity);
+  printf("capacity %zu\n", dyna_capacity(dyna_array));
+  printf("empty %d\n", dyna_empty(dyna_array));
 
   return EXIT_SUCCESS;
 }