Clean log_msg_buffer

include/spdlog/details/log_msg_buffer.h

@@ -9,56 +9,26 @@
 namespace spdlog {
 namespace details {
 
-// regular log_msgs hold string_views to stack data - so they cannot be stored for later use.
-// this one can, since it contains and owns the payload buffer.
+// extend log_msg with internal buffer to store its payload.
+// this is needed since log_msg holds string_views that points to stack data.
+
 struct log_msg_buffer : log_msg
 {
-    fmt::basic_memory_buffer<char, 40> loggername_buf;
-    fmt::basic_memory_buffer<char, 200> payload_buf;
+    fmt::basic_memory_buffer<char, 200> buffer;
     log_msg_buffer() = default;
 
     explicit log_msg_buffer(const log_msg &orig_msg)
         : log_msg(orig_msg)
     {
-        update_buffers();
+        buffer.append(logger_name.begin(), logger_name.end());
+        logger_name = string_view_t{buffer.data(), buffer.size()};
+
+        buffer.append(payload.begin(), payload.end());
+        payload = string_view_t{logger_name.end(), payload.size()};
     }
 
-    log_msg_buffer(const log_msg_buffer &other)
-        : log_msg(other)
-    {
-        update_buffers();
-    }
-
-    log_msg_buffer(const log_msg_buffer &&other) SPDLOG_NOEXCEPT
-        : log_msg(std::move(other))
-    {
-        update_buffers();
-    }
-
-    log_msg_buffer &operator=(const log_msg_buffer &other) SPDLOG_NOEXCEPT
-    {
-        *static_cast<log_msg *>(this) = other;
-        update_buffers();
-        return *this;
-    }
-
-    log_msg_buffer &operator=(log_msg_buffer &&other) SPDLOG_NOEXCEPT
-    {
-        *static_cast<log_msg *>(this) = std::move(other);
-        update_buffers();
-        return *this;
-    }
-
-    void update_buffers() SPDLOG_NOEXCEPT
-    {
-        loggername_buf.clear();
-        loggername_buf.append(logger_name.data(), logger_name.data() + logger_name.size());
-        logger_name = string_view_t{loggername_buf.data(), loggername_buf.size()};
-
-        payload_buf.clear();
-        payload_buf.append(payload.data(), payload.data() + payload.size());
-        payload = string_view_t{payload_buf.data(), payload_buf.size()};
-    }
+    log_msg_buffer(log_msg_buffer &&other) = default;
+    log_msg_buffer &operator=(log_msg_buffer &&other) = default;
 };
 
 } // namespace details