Improve nn.h for include in C++ projects

sakov · Oct 23, 2019 · d540ffe · d540ffe
1 parent c1ff13e
commit d540ffe
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/nn/nn.h b/nn/nn.h
@@ -18,6 +18,10 @@
 #if !defined(_NN_H)
 #define _NN_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef enum { SIBSON, NON_SIBSONIAN } NN_RULE;
 
 /* "point" is a basic data structure in this package.
@@ -347,4 +351,8 @@ extern char* nn_version;
  */
 extern int nn_test_vertice;
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif                          /* _NN_H */