Adds initializers to config to support designated initializers

include/boost/redis/config.hpp

@@ -162,7 +162,7 @@ struct config {
     *
     * UNIX domain sockets can't be used with Sentinel.
     */
-   std::string unix_socket;
+   std::string unix_socket{};
 
    /** @brief (Deprecated) Username used for authentication during connection establishment.
     * 
@@ -212,7 +212,7 @@ struct config {
     * cfg.setup.hello("my_username", "my_password");
     * @endcode
     */
-   std::string password;
+   std::string password{};
 
    /** @brief (Deprecated) Client name parameter to use during connection establishment.
     * 

test/CMakeLists.txt

@@ -52,6 +52,7 @@ boost_redis_make_test(test_generic_flat_response)
 boost_redis_make_test(test_read_buffer)
 boost_redis_make_test(test_subscription_tracker)
 boost_redis_make_test(test_push_parser)
+boost_redis_make_test(test_config)
 
 # Tests that require a real Redis server
 if (BOOST_REDIS_INTEGRATION_TESTS)

test/Jamfile

@@ -91,6 +91,7 @@ local tests =
     test_read_buffer
     test_subscription_tracker
     test_push_parser
+    test_config
 ;
 
 # Build and run the tests

test/test_config.cpp

@@ -0,0 +1,55 @@
+//
+// Copyright (c) 2025 Marcelo Zimbres Silva (mzimbres@gmail.com),
+// Ruben Perez Hidalgo (rubenperez038 at gmail dot com)
+//
+// 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 <boost/redis/config.hpp>
+
+#include <boost/config.hpp>
+
+#if !defined(__cpp_designated_initializers) || (__cpp_designated_initializers < 201707L)
+
+#include <boost/config/pragma_message.hpp>
+
+BOOST_PRAGMA_MESSAGE("test_config skipped because designated initializers are not supported");
+
+int main() { }
+
+#else
+
+#include <boost/core/lightweight_test.hpp>
+
+using namespace boost::redis;
+
+namespace {
+
+// A config object can be created using designated initializers.
+// No initializer is missing
+void test_designated_initializers_config()
+{
+   // Most members have initializers
+   config cfg1{
+      .addr = {"127.0.0.1", "2000"},
+      .use_setup = true,
+   };
+
+   // The ones included above have, too
+   config cfg2{.unix_socket = "/tmp/sock"};
+
+   // Sentinel config has them, too
+   sentinel_config sent_cfg{.addresses = {{"127.0.0.1", "1000"}}};
+}
+
+}  // namespace
+
+int main()
+{
+   test_designated_initializers_config();
+
+   return boost::report_errors();
+}
+
+#endif