Add test_alignment

test/CMakeLists.txt

@@ -17,6 +17,8 @@ boost_test(TYPE run SOURCES test_uuid.cpp LINK_LIBRARIES Boost::container_hash C
 boost_test(TYPE run SOURCES test_uuid.cpp LINK_LIBRARIES Boost::container_hash COMPILE_DEFINITIONS BOOST_UUID_NO_SIMD=1 BOOST_UUID_REPORT_IMPLEMENTATION=1 NAME test_uuid_no_simd)
 boost_test(TYPE run SOURCES test_uuid_2.cpp)
 
+boost_test(TYPE run SOURCES test_alignment.cpp)
+
 boost_test(TYPE run SOURCES test_comparison.cpp COMPILE_DEFINITIONS BOOST_UUID_REPORT_IMPLEMENTATION=1)
 boost_test(TYPE run SOURCES test_comparison.cpp COMPILE_DEFINITIONS BOOST_UUID_NO_SIMD=1 BOOST_UUID_REPORT_IMPLEMENTATION=1 NAME test_comparison_no_simd)
 

test/Jamfile.v2

@@ -51,13 +51,17 @@ alias test_headers : [ test_headers ] ;
 
 run test_include1.cpp test_include2.cpp ;
 
-# main test
+# main tests
 
 run test_uuid.cpp
    : : : <define>BOOST_UUID_REPORT_IMPLEMENTATION ;
 run test_uuid.cpp : : : <define>BOOST_UUID_NO_SIMD <define>BOOST_UUID_REPORT_IMPLEMENTATION : test_uuid_no_simd ;
 run test_uuid_2.cpp ;
 
+# test type properties
+
+run test_alignment.cpp ;
+
 # test comparison
 
 run test_comparison.cpp

test/test_alignment.cpp

@@ -0,0 +1,29 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/uuid/uuid.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <cstddef>
+
+using namespace boost::uuids;
+
+struct X1
+{
+    unsigned char a;
+    uuid b;
+};
+
+struct X2
+{
+    unsigned char a[2];
+    uuid b;
+};
+
+int main()
+{
+    BOOST_TEST_EQ( offsetof(X1, b), 1 );
+    BOOST_TEST_EQ( offsetof(X2, b), 2 );
+
+    return boost::report_errors();
+}