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-rw-r--r--docs/application/interface.md6
1 files changed, 6 insertions, 0 deletions
diff --git a/docs/application/interface.md b/docs/application/interface.md
index b60da5e..6f33f61 100644
--- a/docs/application/interface.md
+++ b/docs/application/interface.md
@@ -42,4 +42,10 @@ typedef struct {
typedef struct {
any value, info;
} kpl_result;
+
+typdef struct {
+ uint16_t slab_index, array_index;
+} kpl_ptr;
+
+#define KPL_PTR_NULL (kpl_ptr) { .slab_index = UINT16_MAX, .array_index = UINT16_MAX }
```