Use a template argument for serializing behaviour

This keeps it a bit more readable.

src/common/communication.cpp

@@ -1,73 +0,0 @@
-// yabridge: a Wine VST bridge
-// Copyright (C) 2020  Robbert van der Helm
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-#include "communication.h"
-
-intptr_t send_event(boost::asio::local::stream_protocol::socket& socket,
-                    bool is_dispatch,
-                    int opcode,
-                    int index,
-                    intptr_t value,
-                    void* data,
-                    float option,
-                    Logger* logger) {
-    // Encode the right payload type for this event. Check the documentation for
-    // `EventPayload` for more information.
-    EventPayload payload = nullptr;
-    if (data != nullptr) {
-        // There are some events that need specific structs that we can't simply
-        // serialize as a string because they might contain null bytes
-        if (is_dispatch && opcode == effProcessEvents) {
-            // Move the elements into a vector for easier serialization
-            payload = DynamicVstEvents(*static_cast<VstEvents*>(data));
-        } else {
-            // TODO: More of these structs
-
-            // Assume buffers are zeroed out, this is probably not the case
-            char* c_string = static_cast<char*>(data);
-            if (c_string[0] != 0) {
-                payload = std::string(c_string);
-            } else {
-                payload = NeedsBuffer{};
-            }
-        }
-    }
-
-    if (logger != nullptr) {
-        logger->log_event(is_dispatch, opcode, index, value, payload, option);
-    }
-
-    const Event event{opcode, index, value, option, payload};
-    write_object(socket, event);
-
-    const auto response = read_object<EventResult>(socket);
-    if (logger != nullptr) {
-        logger->log_event_response(is_dispatch, response.return_value,
-                                   response.data);
-    }
-    if (response.data.has_value()) {
-        char* output = static_cast<char*>(data);
-
-        // For correctness we will copy the entire buffer and add a terminating
-        // null byte ourselves. In practice `response.data` will only ever
-        // contain C-style strings, but this would work with any other data
-        // format that can contain null bytes.
-        std::copy(response.data->begin(), response.data->end(), output);
-        output[response.data->size()] = 0;
-    }
-
-    return response.return_value;
-}