[Ref] xmp-openmpt: Tiny cleanups.

git-svn-id: https://source.openmpt.org/svn/openmpt/trunk/OpenMPT@20362 56274372-70c3-4bfc-bfc3-4c3a0b034d27

libopenmpt/xmp-openmpt/xmp-openmpt.cpp

@@ -135,10 +135,7 @@ class xmp_openmpt_settings
  {
  return;
  }
- virtual ~xmp_openmpt_settings()
- {
- return;
- }
+ virtual ~xmp_openmpt_settings() = default;
 };
 
 struct self_xmplay_t {
@@ -167,9 +164,6 @@ struct self_xmplay_t {
  mod = 0;
  }
  }
- ~self_xmplay_t() {
- return;
- }
 };
 
 static std::string convert_to_native( const std::string & str ) {
@@ -517,8 +511,8 @@ class xmplay_streambuf : public std::streambuf {
  explicit xmplay_streambuf( XMPFILE & file );
 private:
  int_type underflow() override;
- xmplay_streambuf( const xmplay_streambuf & );
- xmplay_streambuf & operator = ( const xmplay_streambuf & );
+ xmplay_streambuf( const xmplay_streambuf & ) = delete;
+ xmplay_streambuf & operator = ( const xmplay_streambuf & ) = delete;
 private:
  XMPFILE & file;
  static inline constexpr std::size_t put_back = 4096;
@@ -554,15 +548,12 @@ class xmplay_istream : public std::istream {
 private:
  xmplay_streambuf buf;
 private:
- xmplay_istream( const xmplay_istream & );
- xmplay_istream & operator = ( const xmplay_istream & );
+ xmplay_istream( const xmplay_istream & ) = delete;
+ xmplay_istream & operator = ( const xmplay_istream & ) = delete;
 public:
  xmplay_istream( XMPFILE & file ) : std::istream(&buf), buf(file) {
  return;
  }
- ~xmplay_istream() {
- return;
- }
 }; // class xmplay_istream
 
 // Stream for memory-based files (required for could_open_probability)