make nearest_neighbor_graph_ann.h #includable from C++

diff --git a/lib/mingle/nearest_neighbor_graph_ann.h b/lib/mingle/nearest_neighbor_graph_ann.h
index a4bf95712e4e7bc9b27b3603a9003ca17891fc75..76da78bc5e532877aa66d1545f47c6f59c455c95 100644 (file)
--- a/lib/mingle/nearest_neighbor_graph_ann.h
+++ b/lib/mingle/nearest_neighbor_graph_ann.h
@@ -11,6 +11,14 @@
 #ifndef NEAREST_NEIGHBOR_GRAPH_ANN_H
 #define NEAREST_NEIGHBOR_GRAPH_ANN_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 void nearest_neighbor_graph_ann(int nPts, int dim, int k, double eps, double *x, int *nz0, int **irn0, int **jcn0, double **val0);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* NEAREST_NEIGHBOR_GRAPH_ANN_H */