logging/backend: Make use of designated initializers

Same behavior, less code.

src/common/logging/backend.cpp

@@ -107,19 +107,19 @@ private:
     Entry CreateEntry(Class log_class, Level log_level, const char* filename, unsigned int line_nr,
                       const char* function, std::string message) const {
         using std::chrono::duration_cast;
+        using std::chrono::microseconds;
         using std::chrono::steady_clock;
 
-        Entry entry;
+        return {
-        entry.timestamp =
+            .timestamp = duration_cast<microseconds>(steady_clock::now() - time_origin),
-            duration_cast<std::chrono::microseconds>(steady_clock::now() - time_origin);
+            .log_class = log_class,
-        entry.log_class = log_class;
+            .log_level = log_level,
-        entry.log_level = log_level;
+            .filename = filename,
-        entry.filename = filename;
+            .line_num = line_nr,
-        entry.line_num = line_nr;
+            .function = function,
-        entry.function = function;
+            .message = std::move(message),
-        entry.message = std::move(message);
+            .final_entry = false,
-
+        };
-        return entry;
     }
 
     std::mutex writing_mutex;

src/common/logging/backend.h

@@ -20,19 +20,13 @@ namespace Log {
  */
 struct Entry {
     std::chrono::microseconds timestamp;
-    Class log_class;
+    Class log_class{};
-    Level log_level;
+    Level log_level{};
-    const char* filename;
+    const char* filename = nullptr;
-    unsigned int line_num;
+    unsigned int line_num = 0;
     std::string function;
     std::string message;
     bool final_entry = false;
-
-    Entry() = default;
-    Entry(Entry&& o) = default;
-
-    Entry& operator=(Entry&& o) = default;
-    Entry& operator=(const Entry& o) = default;
 };
 
 /**