From b0db2effc7ce23700e3aa51e521820d63e91046b Mon Sep 17 00:00:00 2001
From: Elaina Claus <elaina.claus@chtm.me>
Date: Thu, 15 Jan 2026 10:22:01 -0500
Subject: [PATCH] library is now C++ compatible :^)

---
 include/nickel/arena.h      | 14 ++++++++++++++
 include/nickel/argparse.h   | 10 ++++++++++
 include/nickel/bitman.h     | 10 ++++++++++
 include/nickel/buf.h        | 10 ++++++++++
 include/nickel/ctassert.h   | 10 ++++++++++
 include/nickel/defer.h      | 10 ++++++++++
 include/nickel/hashmap.h    | 10 ++++++++++
 include/nickel/ini.h        | 10 ++++++++++
 include/nickel/io.h         | 10 ++++++++++
 include/nickel/linkedlist.h |  8 ++++++++
 include/nickel/log.h        | 10 ++++++++++
 include/nickel/refcnt.h     | 10 ++++++++++
 include/nickel/result.h     | 10 ++++++++++
 include/nickel/ring_spsc.h  | 10 ++++++++++
 include/nickel/span.h       | 10 ++++++++++
 include/nickel/threadpool.h | 10 ++++++++++
 include/nickel/timeutil.h   | 10 ++++++++++
 include/nickel/version.h    | 10 ++++++++++
 include/nickel/xalloc.h     | 10 ++++++++++
 19 files changed, 192 insertions(+)

diff --git a/include/nickel/arena.h b/include/nickel/arena.h
index e69de29..d32a0ad 100644
--- a/include/nickel/arena.h
+++ b/include/nickel/arena.h
@@ -0,0 +1,14 @@
+#ifndef __NICKEL_ARENA_H_
+#define __NICKEL_ARENA_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* __NICKEL_ARENA_H_ */
\ No newline at end of file
diff --git a/include/nickel/argparse.h b/include/nickel/argparse.h
index da1b842..c440bf0 100644
--- a/include/nickel/argparse.h
+++ b/include/nickel/argparse.h
@@ -1,4 +1,14 @@
 #ifndef __NICKEL_ARGPARSE_H_
 #define __NICKEL_ARGPARSE_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __NICKEL_ARGPARSE_H_ */
\ No newline at end of file
diff --git a/include/nickel/bitman.h b/include/nickel/bitman.h
index ca35a63..82bec2b 100644
--- a/include/nickel/bitman.h
+++ b/include/nickel/bitman.h
@@ -1,4 +1,14 @@
 #ifndef __NICKEL_BITMAN_H_
 #define __NICKEL_BITMAN_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __NICKEL_BITMAN_H_ */
\ No newline at end of file
diff --git a/include/nickel/buf.h b/include/nickel/buf.h
index 689d71b..b094eb1 100644
--- a/include/nickel/buf.h
+++ b/include/nickel/buf.h
@@ -1,4 +1,14 @@
 #ifndef __NICKEL_BUF_H_
 #define __NICKEL_BUF_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __NICKEL_BUF_H_ */
\ No newline at end of file
diff --git a/include/nickel/ctassert.h b/include/nickel/ctassert.h
index bc82574..4104ea2 100644
--- a/include/nickel/ctassert.h
+++ b/include/nickel/ctassert.h
@@ -1,4 +1,14 @@
 #ifndef __NICKEL_CTASSERT_H_
 #define __NICKEL_CTASSERT_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __NICKEL_CTASSERT_H_ */
\ No newline at end of file
diff --git a/include/nickel/defer.h b/include/nickel/defer.h
index 13d7afe..fdf451f 100644
--- a/include/nickel/defer.h
+++ b/include/nickel/defer.h
@@ -1,4 +1,14 @@
 #ifndef __NICKEL_DEFER_H_
 #define __NICKEL_DEFER_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __NICKEL_DEFER_H_ */
\ No newline at end of file
diff --git a/include/nickel/hashmap.h b/include/nickel/hashmap.h
index f63bb37..829bf0f 100644
--- a/include/nickel/hashmap.h
+++ b/include/nickel/hashmap.h
@@ -1,4 +1,14 @@
 #ifndef __NICKEL_HASHMAP_H_
 #define __NICKEL_HASHMAP_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __NICKEL_HASHMAP_H_ */
\ No newline at end of file
diff --git a/include/nickel/ini.h b/include/nickel/ini.h
index bb4d47f..4ea45ab 100644
--- a/include/nickel/ini.h
+++ b/include/nickel/ini.h
@@ -1,4 +1,14 @@
 #ifndef __NICKEL_INI_H_
 #define __NICKEL_INI_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __NICKEL_INI_H_ */
\ No newline at end of file
diff --git a/include/nickel/io.h b/include/nickel/io.h
index c60f0f2..f5afdd3 100644
--- a/include/nickel/io.h
+++ b/include/nickel/io.h
@@ -1,4 +1,14 @@
 #ifndef __NICKEL_IO_H_
 #define __NICKEL_IO_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __NICKEL_IO_H_ */
\ No newline at end of file
diff --git a/include/nickel/linkedlist.h b/include/nickel/linkedlist.h
index fcaa565..5ac4121 100644
--- a/include/nickel/linkedlist.h
+++ b/include/nickel/linkedlist.h
@@ -6,6 +6,10 @@
 #include <stdint.h>
 #include <stdbool.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef struct ni_list_node {
   struct ni_list_node* next;
   struct ni_list_node* prev;
@@ -65,4 +69,8 @@ static inline ni_list_node* ni_list__get_back(ni_list* l) {
 #define NI_LIST_CONTAINER_OF(ptr, type, member) \
     ((type*)((uint8_t*)(ptr) - offsetof(type, member)))
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif	/* __NICKEL_LINKEDLIST_H_ */
\ No newline at end of file
diff --git a/include/nickel/log.h b/include/nickel/log.h
index 70e4d90..c8dde18 100644
--- a/include/nickel/log.h
+++ b/include/nickel/log.h
@@ -1,4 +1,14 @@
 #ifndef __NICKEL_LOG_H_
 #define __NICKEL_LOG_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __NICKEL_LOG_H_ */
\ No newline at end of file
diff --git a/include/nickel/refcnt.h b/include/nickel/refcnt.h
index ac1f7aa..c3b045e 100644
--- a/include/nickel/refcnt.h
+++ b/include/nickel/refcnt.h
@@ -1,4 +1,14 @@
 #ifndef __NICKEL_REFCNT_H_
 #define __NICKEL_REFCNT_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __NICKEL_REFCNT_H_ */
\ No newline at end of file
diff --git a/include/nickel/result.h b/include/nickel/result.h
index cdeb3bf..d5aa486 100644
--- a/include/nickel/result.h
+++ b/include/nickel/result.h
@@ -1,4 +1,14 @@
 #ifndef __NICKEL_RESULT_H_
 #define __NICKEL_RESULT_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __NICKEL_RESULT_H_ */
\ No newline at end of file
diff --git a/include/nickel/ring_spsc.h b/include/nickel/ring_spsc.h
index 29ae2be..bdf9a5b 100644
--- a/include/nickel/ring_spsc.h
+++ b/include/nickel/ring_spsc.h
@@ -1,4 +1,14 @@
 #ifndef __NICKEL_RINGSPSC_H_
 #define __NICKEL_RINGSPSC_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __NICKEL_RINGSPSC_H_ */
\ No newline at end of file
diff --git a/include/nickel/span.h b/include/nickel/span.h
index 2cfe260..9004869 100644
--- a/include/nickel/span.h
+++ b/include/nickel/span.h
@@ -1,4 +1,14 @@
 #ifndef __NICKEL_SPAN_H_
 #define __NICKEL_SPAN_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __NICKEL_SPAN_H_ */
\ No newline at end of file
diff --git a/include/nickel/threadpool.h b/include/nickel/threadpool.h
index 0f06980..fb1ddc7 100644
--- a/include/nickel/threadpool.h
+++ b/include/nickel/threadpool.h
@@ -1,4 +1,14 @@
 #ifndef __NICKEL_THREADPOOL_H_
 #define __NICKEL_THREADPOOL_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __NICKEL_THREADPOOL_H_ */
\ No newline at end of file
diff --git a/include/nickel/timeutil.h b/include/nickel/timeutil.h
index 8680f09..e4d3aa0 100644
--- a/include/nickel/timeutil.h
+++ b/include/nickel/timeutil.h
@@ -1,4 +1,14 @@
 #ifndef __NICKEL_TIMEUTIL_H_
 #define __NICKEL_TIMEUTIL_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __NICKEL_TIMEUTIL_H_ */
\ No newline at end of file
diff --git a/include/nickel/version.h b/include/nickel/version.h
index 6b33a6e..74059d5 100644
--- a/include/nickel/version.h
+++ b/include/nickel/version.h
@@ -1,4 +1,14 @@
 #ifndef __NICKEL_VERSION_H_
 #define __NICKEL_VERSION_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __NICKEL_VERSION_H_ */
\ No newline at end of file
diff --git a/include/nickel/xalloc.h b/include/nickel/xalloc.h
index f7ffbe2..4149f78 100644
--- a/include/nickel/xalloc.h
+++ b/include/nickel/xalloc.h
@@ -1,4 +1,14 @@
 #ifndef __NICKEL_XALLOC_H_
 #define __NICKEL_XALLOC_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* header contents */
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __NICKEL_XALLOC_H_ */
\ No newline at end of file