cv_bridge test: remove boost

cv_bridge/test/CMakeLists.txt

@@ -14,7 +14,6 @@ endif()
 # enable cv_bridge C++ tests
 find_package(ament_cmake_gtest REQUIRED)
 ament_add_gtest(${PROJECT_NAME}-utest
-  test_endian.cpp
   test_compression.cpp
   utest.cpp utest2.cpp
   test_rgb_colors.cpp

cv_bridge/test/test_endian.cpp

@@ -1,12 +1,20 @@
-#include <boost/endian/conversion.hpp>
 #include <cv_bridge/cv_bridge.h>
 #include <gtest/gtest.h>
 #include <memory>
 
+typedef union uEndianTest {
+  struct {
+    bool flittle_endian;
+    bool fill[3];
+  };
+  long value;
+} EndianTest;
+
+static const EndianTest __Endian_Test__ = { .value=1 };
+const bool platform_big_endian = !__Endian_Test__.flittle_endian;
+
 TEST(CvBridgeTest, endianness)
 {
-  using namespace boost::endian;
-
   // Create an image of the type opposite to the platform
   sensor_msgs::msg::Image msg;
   msg.height = 1;
@@ -18,7 +26,7 @@ TEST(CvBridgeTest, endianness)
   int32_t * data = reinterpret_cast<int32_t *>(&msg.data[0]);
 
   // Write 1 and 2 in order, but with an endianness opposite to the platform
-  if (order::native == order::little) {
+  if (!platform_big_endian) {
     msg.is_bigendian = true;
     *(data++) = native_to_big(static_cast<int32_t>(1));
     *data = native_to_big(static_cast<int32_t>(2));