use '= default' to define a trivial destructor

Generated by clang-tidy modernize-use-equals-default

.clang-tidy

@@ -1,6 +1,6 @@
 ---
 # Only run a few checks for now.
-Checks:          'modernize-use-override'
+Checks:          'modernize-use-equals-default'
 WarningsAsErrors: ''
 HeaderFilterRegex: ''
 AnalyzeTemporaryDtors: false

muduo/base/Exception.cc

@@ -23,9 +23,7 @@ Exception::Exception(const string& msg)
   fillStackTrace();
 }
 
-Exception::~Exception() throw ()
-{
-}
+Exception::~Exception() throw () = default;
 
 const char* Exception::what() const throw()
 {

muduo/base/LogFile.cc

@@ -28,9 +28,7 @@ LogFile::LogFile(const string& basename,
   rollFile();
 }
 
-LogFile::~LogFile()
-{
-}
+LogFile::~LogFile() = default;
 
 void LogFile::append(const char* logline, int len)
 {

muduo/base/TimeZone.h

@@ -19,7 +19,7 @@ class TimeZone : public muduo::copyable
  public:
   explicit TimeZone(const char* zonefile);
   TimeZone(int eastOfUtc, const char* tzname);  // a fixed timezone
-  TimeZone() {}  // an invalid timezone
+  TimeZone() = default;  // an invalid timezone
 
   // default copy ctor/assignment/dtor are Okay.
 

muduo/net/Poller.cc

@@ -18,9 +18,7 @@ Poller::Poller(EventLoop* loop)
 {
 }
 
-Poller::~Poller()
-{
-}
+Poller::~Poller() = default;
 
 bool Poller::hasChannel(Channel* channel) const
 {

muduo/net/poller/PollPoller.cc

@@ -24,9 +24,7 @@ PollPoller::PollPoller(EventLoop* loop)
 {
 }
 
-PollPoller::~PollPoller()
-{
-}
+PollPoller::~PollPoller() = default;
 
 Timestamp PollPoller::poll(int timeoutMs, ChannelList* activeChannels)
 {

muduo/net/protobuf/ProtobufCodecLite.h

@@ -91,7 +91,7 @@ class ProtobufCodecLite : noncopyable
   {
   }
 
-  virtual ~ProtobufCodecLite() { }
+  virtual ~ProtobufCodecLite() = default;
 
   const string& tag() const { return tag_; }