diff --git a/common/uipriv.h b/common/uipriv.h
index 629366e5..335b7094 100644
--- a/common/uipriv.h
+++ b/common/uipriv.h
@@ -30,31 +30,11 @@ extern bool uiprivSysCheckThread(void);
 // alloc.c
 #define sharedbitsPrefix uipriv
 #include "../sharedbits/alloc_header.h"
-typedef struct uiprivArray uiprivArray;
-struct uiprivArray {
-	void *buf;
-	size_t len;
-	size_t cap;
-	size_t elemsize;
-	size_t nGrow;
-	const char *what;
-};
+#include "../sharedbits/array_header.h"
 #define uiprivArrayStaticInit(T, grow, whatstr) { NULL, 0, 0, sizeof (T), grow, whatstr }
-#define uiprivArrayInit(arr, T, grow, whatstr) \
-	memset(&(arr), 0, sizeof (uiprivArray)); \
-	arr.elemsize = sizeof (T); \
-	arr.nGrow = grow; \
-	arr.what = whatstr;
-#define uiprivArrayFree(arr) \
-	uiprivFree(arr.buf); \
-	memset(&arr, 0, sizeof (uiprivArray));
+#define uiprivArrayInit(arr, T, nGrow, what) uiprivArrayInitFull(&(arr), sizeof (T), nGrow, what)
+#define uiprivArrayFree(arr) uiprivArrayFreeFull(&(arr))
 #define uiprivArrayAt(arr, T, n) (((T *) (arr.buf)) + (n))
-extern void *uiprivArrayAppend(uiprivArray *arr, size_t n);
-extern void *uiprivArrayInsertAt(uiprivArray *arr, size_t pos, size_t n);
-extern void uiprivArrayDelete(uiprivArray *arr, size_t pos, size_t n);
-extern void uiprivArrayDeleteItem(uiprivArray *arr, void *p, size_t n);
-extern void *uiprivArrayBsearch(const uiprivArray *arr, const void *key, int (*compare)(const void *, const void *));
-extern void uiprivArrayQsort(uiprivArray *arr, int (*compare)(const void *, const void *));
 #undef sharedbitsPrefix
 
 // errors.c
diff --git a/sharedbits/array_header.h b/sharedbits/array_header.h
index 268be7e4..22f46255 100644
--- a/sharedbits/array_header.h
+++ b/sharedbits/array_header.h
@@ -3,4 +3,33 @@
 
 #include "start.h"
 
+typedef struct sharedbitsPrefixName(Array) sharedbitsPrefixName(Array);
+
+struct sharedbitsPrefixName(Array) {
+	void *buf;
+	size_t len;
+	size_t cap;
+	size_t elemsize;
+	size_t nGrow;
+	const char *what;
+};
+
+extern void sharedbitsPrefixName(ArrayInitFull)(sharedbitsPrefixName(Array) *arr, size_t elemsize, size_t nGrow, const char *what);
+extern void sharedbitsPrefixName(ArrayFreeFull)(sharedbitsPrefixName(Array) *arr);
+extern void *sharedbitsPrefixName(ArrayAppend)(sharedbitsPrefixName(Array) *arr, size_t n);
+extern void *sharedbitsPrefixName(ArrayInsertAt)(sharedbitsPrefixName(Array) *arr, size_t pos, size_t n);
+extern void sharedbitsPrefixName(ArrayDelete)(sharedbitsPrefixName(Array) *arr, size_t pos, size_t n);
+extern void sharedbitsPrefixName(ArrayDeleteItem)(sharedbitsPrefixName(Array) *arr, void *p, size_t n);
+extern void *sharedbitsPrefixName(ArrayBsearch)(const sharedbitsPrefixName(Array) *arr, const void *key, int (*compare)(const void *, const void *));
+extern void sharedbitsPrefixName(ArrayQsort)(sharedbitsPrefixName(Array) *arr, int (*compare)(const void *, const void *));
+
+/*
+you may also want to define the following:
+
+#define sharedbitsPrefixName(StaticInit)(T, nGrow, what) { NULL, 0, 0, sizeof (T), nGrow, what }
+#define sharedbitsPrefixName(Init)(arr, T, nGrow, what) sharedbitsPrefixName(InitFull)(&(arr), sizeof (T), nGrow, what)
+#define sharedbitsPrefixName(ArrayFree)(arr) sharedbitsPrefixName(ArrayFreeFull)(&(arr))
+#define sharedbitsPrefixName(ArrayAt)(arr, T, n) (((T *) (arr.buf)) + (n))
+*/
+
 #include "end.h"
diff --git a/sharedbits/array_impl.h b/sharedbits/array_impl.h
index 4d476408..8b736594 100644
--- a/sharedbits/array_impl.h
+++ b/sharedbits/array_impl.h
@@ -3,4 +3,18 @@
 
 #include "start.h"
 
+void sharedbitsPrefixName(ArrayInitFull)(sharedbitsPrefixName(Array) *arr, size_t elemsize, size_t nGrow, const char *what)
+{
+	memset(arr, 0, sizeof (sharedbitsPrefixName(Array)));
+	arr->elemsize = elemsize;
+	arr->nGrow = nGrow;
+	arr->what = what;
+}
+
+void sharedbitsPrefixName(ArrayFreeFull)(sharedbitsPrefixName(Array) *arr)
+{
+	sharedbitsPrefixName(Free)(arr->buf);
+	memset(arr, 0, sizeof (sharedbitsPrefixName(Array)));
+}
+
 #include "end.h"
diff --git a/test/lib/testingpriv.h b/test/lib/testingpriv.h
index c8f655d0..8bf04ac7 100644
--- a/test/lib/testingpriv.h
+++ b/test/lib/testingpriv.h
@@ -9,31 +9,11 @@ extern void testingprivInternalError(const char *fmt, ...);
 #define testingprivNewArray(T, n) ((T *) testingprivAlloc(n * sizeof (T), #T "[]"))
 #define testingprivResizeArray(x, T, old, new) ((T *) testingprivRealloc(x, old * sizeof (T), new * sizeof (T), #T "[]"))
 
-typedef struct testingprivArray testingprivArray;
-struct testingprivArray {
-	void *buf;
-	size_t len;
-	size_t cap;
-	size_t elemsize;
-	size_t nGrow;
-	const char *what;
-};
-#define testingprivArrayStaticInit(T, grow, whatstr) { NULL, 0, 0, sizeof (T), grow, whatstr }
-#define testingprivArrayInit(arr, T, grow, whatstr) \
-	memset(&(arr), 0, sizeof (testingprivArray)); \
-	arr.elemsize = sizeof (T); \
-	arr.nGrow = grow; \
-	arr.what = whatstr;
-#define testingprivArrayFree(arr) \
-	testingprivFree(arr.buf); \
-	memset(&arr, 0, sizeof (testingprivArray));
+#include "../../sharedbits/array_header.h"
+#define testingprivArrayStaticInit(T, nGrow, what) { NULL, 0, 0, sizeof (T), nGrow, what }
+#define testingprivArrayInit(arr, T, nGrow, what) testingprivArrayInitFull(&(arr), sizeof (T), nGrow, what)
+#define testingprivArrayFree(arr) testingprivArrayFreeFull(&(arr))
 #define testingprivArrayAt(arr, T, n) (((T *) (arr.buf)) + (n))
-extern void *testingprivArrayAppend(testingprivArray *arr, size_t n);
-extern void *testingprivArrayInsertAt(testingprivArray *arr, size_t pos, size_t n);
-extern void testingprivArrayDelete(testingprivArray *arr, size_t pos, size_t n);
-extern void testingprivArrayDeleteItem(testingprivArray *arr, void *p, size_t n);
-extern void *testingprivArrayBsearch(const testingprivArray *arr, const void *key, int (*compare)(const void *, const void *));
-extern void testingprivArrayQsort(testingprivArray *arr, int (*compare)(const void *, const void *));
 
 #undef sharedbitsPrefix