Add function for_each_field_with_name (#171)

test/core_name/run/for_each_field_with_name.cpp

@@ -0,0 +1,31 @@
+// Copyright (c) 2016-2024 Lena Bertho
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#include <map>
+#include <string>
+
+#include <boost/pfr/core_name.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+
+struct SimpleStruct {
+    char c;
+    std::string str;
+};
+
+
+int main () {
+    std::map<std::string, std::string> m;
+    auto fill = [&m](std::string_view name, const auto& value){
+        m[std::string(name)] = value;
+    };
+
+    boost::pfr::for_each_field_with_name(SimpleStruct{ 'e', "test"}, fill);
+    BOOST_TEST_EQ(m.size(), 2);
+    BOOST_TEST_EQ(m["c"], "e");
+    BOOST_TEST_EQ(m["str"], "test");
+
+    return boost::report_errors();
+}