From 0ba7e6a892877a2ac0015a4dfe9249fa2e255f31 Mon Sep 17 00:00:00 2001
From: Jinzhe Zeng <jinzhe.zeng@rutgers.edu>
Date: Sat, 4 May 2024 14:54:06 -0400
Subject: [PATCH] feat(C): add preprocessor define for C API version (#3737)

It will be helpful for the downstream program to require a minimal
version of the C API.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Documentation**
	- Updated the C API version to 22 in the documentation.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Signed-off-by: Jinzhe Zeng <jinzhe.zeng@rutgers.edu>
---
 source/api_c/include/c_api.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/source/api_c/include/c_api.h b/source/api_c/include/c_api.h
index 3ba5b5e107..2f88f25e43 100644
--- a/source/api_c/include/c_api.h
+++ b/source/api_c/include/c_api.h
@@ -7,6 +7,13 @@ extern "C" {
 #include <stdbool.h>
 #endif
 
+/** @file */
+
+/** C API version. Bumped whenever the API is changed.
+ * @since API version 22
+ */
+#define DP_C_API_VERSION 22
+
 /**
  * @brief Neighbor list.
  */