Completed vector implementation and added sample usage

src/vector.h

@@ -3,8 +3,8 @@
 
 #define RESULT_MSG_SIZE 64
 
-#include <stdint.h> // for uint8_t
-#include <stddef.h> // for size_t
+#include <stdint.h>
+#include <stddef.h>
 
 // Vector data type
 typedef struct {
@@ -14,24 +14,46 @@ typedef struct {
     void *elements;
 } Vector;
 
-// Result data type
+// Result status codes
+typedef enum {
+    VECTOR_OK = 0x0,
+    VECTOR_ERR_ALLOCATE,
+    VECTOR_ERR_OVERFLOW,
+    VECTOR_ERR_UNDERFLOW,
+    VECTOR_ERR_INVALID
+} VectorStatus;
+
+// Wrapper data type for vector APIs
 typedef struct {
-    uint8_t status;
+    VectorStatus status;
     uint8_t message[RESULT_MSG_SIZE];
     union {
         Vector *vector;
         void *element;
     } value;
-} Result;
+} VectorResult;
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-Result vector_new(size_t size, size_t data_size);
-Result vector_push(Vector *vector, void *value);
-Result vector_get(Vector *vector, size_t index);
-Result vector_free(Vector *vector);
+// public APIs
+VectorResult vector_new(size_t size, size_t data_size);
+VectorResult vector_push(Vector *vector, void *value);
+VectorResult vector_set(Vector *vector, size_t index, void *value);
+VectorResult vector_get(Vector *vector, size_t index);
+VectorResult vector_pop(Vector *vector);
+VectorResult vector_clear(Vector *vector);
+VectorResult vector_free(Vector *vector);
+
+// Inline methods
+static inline size_t vector_size(const Vector *vector) {
+    return vector ? vector->count : 0;
+}
+
+static inline size_t vector_capacity(const Vector *vector) {
+    return vector ? vector->capacity : 0;
+}
 
 #ifdef __cplusplus
 }