Use designated initializers for complex structs

This was one of the main reasons why I wanted to switch to C++20, I just
forgot to do it.

src/common/events.h

@@ -160,7 +160,12 @@ intptr_t send_event(boost::asio::local::stream_protocol::socket& socket,
                          value_payload);
     }
 
-    const Event event{opcode, index, value, option, payload, value_payload};
+    const Event event{.opcode = opcode,
+                      .index = index,
+                      .value = value,
+                      .option = option,
+                      .payload = payload,
+                      .value_payload = value_payload};
 
     // Prevent two threads from writing over the socket at the same time and
     // messages getting out of order. This is needed because we can't prevent
@@ -394,7 +399,9 @@ auto passthrough_event(AEffect* plugin, F callback) {
                 std::visit(write_payload_fn, *event.value_payload);
         }
 
-        EventResult response{return_value, response_data, value_response_data};
+        EventResult response{.return_value = return_value,
+                             .payload = response_data,
+                             .value_payload = value_response_data};
 
         return response;
     };

src/plugin/host-process.cpp

@@ -166,8 +166,9 @@ GroupHost::GroupHost(
         boost::asio::local::stream_protocol::socket group_socket(io_context);
         group_socket.connect(group_socket_path.string());
 
-        write_object(group_socket, GroupRequest{plugin_path.string(),
-                                                socket_endpoint.string()});
+        write_object(group_socket,
+                     GroupRequest{.plugin_path = plugin_path.string(),
+                                  .socket_path = socket_endpoint.string()});
         const auto response = read_object<GroupResponse>(group_socket);
 
         host_pid = response.pid;
@@ -202,9 +203,10 @@ GroupHost::GroupHost(
                         io_context);
                     group_socket.connect(group_socket_path.string());
 
-                    write_object(group_socket,
-                                 GroupRequest{plugin_path.string(),
-                                              socket_endpoint.string()});
+                    write_object(
+                        group_socket,
+                        GroupRequest{.plugin_path = plugin_path.string(),
+                                     .socket_path = socket_endpoint.string()});
                     const auto response =
                         read_object<GroupResponse>(group_socket);
 

src/plugin/plugin-bridge.cpp

@@ -155,7 +155,9 @@ PluginBridge::PluginBridge(audioMasterCallback host_callback)
 
                             incoming_midi_events.push_back(
                                 std::get<DynamicVstEvents>(event.payload));
-                            EventResult response{1, nullptr, std::nullopt};
+                            EventResult response{.return_value = 1,
+                                                 .payload = nullptr,
+                                                 .value_payload = std::nullopt};
 
                             return response;
                         } else {

src/wine-host/bridges/vst2.cpp

@@ -132,7 +132,9 @@ Vst2Bridge::Vst2Bridge(boost::asio::io_context& main_context,
     // of this object will be sent over the `dispatcher()` socket. This would be
     // done after the host calls `effOpen()`, and when the plugin calls
     // `audioMasterIOChanged()`.
-    write_object(host_vst_control, EventResult{0, *plugin, std::nullopt});
+    write_object(host_vst_control, EventResult{.return_value = 0,
+                                               .payload = *plugin,
+                                               .value_payload = std::nullopt});
 
     // After sending the AEffect struct we'll receive this instance's
     // configuration as a response
@@ -218,8 +220,9 @@ void Vst2Bridge::handle_dispatch_midi_events() {
                             plugin, event.opcode, event.index, event.value,
                             &events.as_c_events(), event.option);
 
-                        EventResult response{return_value, nullptr,
-                                             std::nullopt};
+                        EventResult response{.return_value = return_value,
+                                             .payload = nullptr,
+                                             .value_payload = std::nullopt};
 
                         return response;
                     } else {