TEST: Added test for passing xt::xtensor_fixed<...>& to functions

integration_tests/array_06.cpp

@@ -0,0 +1,32 @@
+#include <iostream>
+#include <xtensor/xfixed.hpp>
+#include "xtensor/xio.hpp"
+#include "xtensor/xview.hpp"
+
+double reduce_array(xt::xtensor_fixed<double, xt::xshape<3, 3>>& arr) {
+    double sum = 0.0;
+    for( int i = 0; i < arr.shape(0); i++ ) {
+        for( int j = 0; j < arr.shape(1); j++ ) {
+            sum += arr(i, j);
+        }
+    }
+    return sum;
+}
+
+int main() {
+
+    xt::xtensor_fixed<double, xt::xshape<3, 3>> arr1;
+    double result;
+
+    for( int i = 0; i < 3; i++ ) {
+        for( int j = 0; j < 3; j++ ) {
+            arr1(i, j) = i*3 + j;
+        }
+    }
+
+    std::cout << arr1 << std::endl;
+    result = reduce_array(arr1);
+    std::cout << result << std::endl;
+
+    return 0;
+}