kou commented on code in PR #13115:
URL: https://github.com/apache/arrow/pull/13115#discussion_r869635008
##########
cpp/src/arrow/c/abi.h:
##########
@@ -60,6 +63,11 @@ struct ArrowArray {
void* private_data;
};
+#endif // ARROW_C_DATA_H
Review Comment:
It seems that this mixes `extern "C" {...}` and `#ifndef ... #endif`:
```c
#ifndef ARROW_C_DATA_H
#define ARROW_C_DATA_H
#ifdef __cplusplus
extern "C" {
#endif
#endif // ARROW_C_DATA_H
#ifndef ARROW_C_STREAM_H
#define ARROW_C_STREAM_H
#ifdef __cplusplus
}
#endif
#endif // ARROW_C_STREAM_H
```
I think that it may not be safe. How about avoiding the mix?
```c
#ifndef ARROW_C_DATA_H
#define ARROW_C_DATA_H
#ifdef __cplusplus
extern "C" {
#endif
#ifdef __cplusplus
}
#endif
#endif // ARROW_C_DATA_H
#ifndef ARROW_C_STREAM_H
#define ARROW_C_STREAM_H
#ifdef __cplusplus
extern "C" {
#endif
#ifdef __cplusplus
}
#endif
#endif // ARROW_C_STREAM_H
```
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