1 files changed, 19 insertions, 0 deletions
diff --git a/common.h b/common.h
new file mode 100644
index 0000000..36ca06f
--- /dev/null
+++ b/common.h
@@ -0,0 +1,19 @@
+/* See LICENSE file for copyright and license details. */
+#include "libtellurian.h"
+
+#include <stddef.h>
+#include <math.h>
+
+
+#if __GNUC__
+# pragma GCC diagnostic ignored "-Wunsuffixed-float-constants"
+#endif
+
+
+#define radians(DEG)  ((double)M_PI / 180.0 * (DEG))
+#define degrees(RAD)  (180.0 / (double)M_PI * (RAD))
+#define haversin(X)   (fma(-0.5, cos(X), 0.5))
+
+
+void libtellurian_vincenty_inverse__(double latitude1, double longitude1, double latitude2, double longitude2,
+                                     double *distance_out, double *azimuth1_out, double *azimuth2_out);