Merge pull request #1365 from awulkiew/fix/warning

[formulas] Fix warning (variable hiding member) in sjoberg_intersection

Author: awulkiew

include/boost/geometry/formulas/sjoberg_intersection.hpp

@@ -1,6 +1,6 @@
 // Boost.Geometry
 
-// Copyright (c) 2023 Adam Wulkiewicz, Lodz, Poland.
+// Copyright (c) 2023-2025 Adam Wulkiewicz, Lodz, Poland.
 
 // Copyright (c) 2016-2019 Oracle and/or its affiliates.
 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
@@ -566,7 +566,6 @@ class sjoberg_geodesic
     {
         CT const c0 = 0;
         CT const dLj = d_lambda(c0);
-        CT const asin_tj_t0j = asin(Cj * tan_betaj / sqrt_1_Cj_sqr);
         return lonj - asin_tj_t0j + dLj;
     }
 
@@ -676,8 +675,8 @@ class sjoberg_intersection
         CT const f = formula::flattening<CT>(spheroid);
         CT const one_minus_f = c1 - f;
 
-        geodesic_type geod1(lon_a1, lat_a1, alpha_a1, f);
-        geodesic_type geod2(lon_b1, lat_b1, alpha_b1, f);
+        geodesic_type const geod1(lon_a1, lat_a1, alpha_a1, f);
+        geodesic_type const geod2(lon_b1, lat_b1, alpha_b1, f);
 
         // Cj = 1 if on equator <=> sqrt_1_Cj_sqr = 0
         // Cj = 0 if vertical <=> sqrt_1_Cj_sqr = 1

test/formulas/intersection.cpp

@@ -1,6 +1,8 @@
 // Boost.Geometry
 // Unit Test
 
+// Copyright (c) 2025 Adam Wulkiewicz, Lodz, Poland.
+
 // Copyright (c) 2016-2019 Oracle and/or its affiliates.
 
 // Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle
@@ -185,6 +187,19 @@ void test_bugs()
     }
 }
 
+void test_special_cases()
+{
+    {
+        double lon, lat;
+        bg::formula::sjoberg_intersection<double, bg::formula::andoyer_inverse, 1>
+            ::apply(-0.01, 0.0, 0.01, 0.0,
+                    0.0, -0.01, 0.0, 0.01,
+                    lon, lat, bg::srs::spheroid<double>());
+        check_one("geodesic on equator", lon, 0.0);
+        check_one("geodesic on equator", lat, 0.0);
+    }
+}
+
 int test_main(int, char*[])
 {
     for (size_t i = 0; i < expected_size; ++i)
@@ -193,6 +208,7 @@ int test_main(int, char*[])
     }
 
     test_bugs();
+    test_special_cases();
 
     return 0;
 }