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-rw-r--r--libcrystfel/src/histogram.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/libcrystfel/src/histogram.h b/libcrystfel/src/histogram.h
index 815c2f76..c3ff27f7 100644
--- a/libcrystfel/src/histogram.h
+++ b/libcrystfel/src/histogram.h
@@ -33,6 +33,9 @@
#include <config.h>
#endif
+#ifdef __cplusplus
+extern "C" {
+#endif
typedef struct _histogram Histogram;
@@ -49,4 +52,8 @@ extern void histogram_set_min(Histogram *hi, double min);
extern void histogram_set_max(Histogram *hi, double max);
extern void histogram_set_num_bins(Histogram *hi, int n);
+#ifdef __cplusplus
+}
+#endif
+
#endif /* HISTOGRAM_H */