---
title: ex_cb_t
framework: Kernel
role: symbol
role_heading: Type Alias
platforms: [macOS 11.0+]
path: kernel/ex_cb_t
---

# ex_cb_t

## Declaration

```occ
typedef ex_cb_action_t (*ex_cb_t)(ex_cb_class_t cb_class, void *refcon, const ex_cb_state_t *state);
```