From 6318366a105bc8b9b5e79fd3c5cfba62618142cb Mon Sep 17 00:00:00 2001
From: xiaoyifang <yifang.xiao@outlook.com>
Date: Sun, 9 Jan 2022 16:18:55 +0800
Subject: [PATCH] improve:refactor code ,reimplement sptr class.

---
 sptr.hh | 139 ++------------------------------------------------------
 1 file changed, 5 insertions(+), 134 deletions(-)

diff --git a/sptr.hh b/sptr.hh
index 1f9b3212..d7f39b2d 100644
--- a/sptr.hh
+++ b/sptr.hh
@@ -4,151 +4,22 @@
 #ifndef __SPTR_HH_INCLUDED__
 #define __SPTR_HH_INCLUDED__
 
-// A generic non-intrusive smart-pointer template. We could use boost::, tr1::
-// or whatever, but since there's no standard solution yet, it isn't worth
-// the dependency given the simplicity of the template.
+// using std::shared_ptr
+
 
 template< class T >
-class sptr_base
-{
-  template< class TT > friend class sptr_base;
-
-  T * p;
-  unsigned * count;
-
-
-  void increment()
-  {
-    if ( count )
-      ++*count;
-  }
-
-public:
-
-  sptr_base(): p( 0 ), count( 0 ) {}
-
-  sptr_base( T * p_ ): p( p_ ), count( p ? new unsigned( 1 ) : 0 )
-  {
-  }
-
-  sptr_base( sptr_base< T > const & other ): p( other.p ), count( other.count )
-  { increment(); }
-
-  // TT is meant to be a derivative of T
-  template< class TT >
-  sptr_base( sptr_base< TT > const & other ): p( ( T * ) other.p ),
-    count( other.count )
-  { increment(); }
-
-  void reset()
-  {
-    if ( count )
-    {
-      if ( ! -- *count )
-      {
-        delete count;
-
-        count = 0;
-
-        if ( p )
-        {
-          T * p_ = p;
-  
-          p = 0;
-  
-          delete p_;
-        }
-      }
-      else
-      {
-        p = 0;
-        count = 0;
-      }
-    }
-  }
-
-  sptr_base & operator = ( sptr_base const & other )
-  { if ( &other != this ) { reset(); p = other.p; count = other.count; increment(); }
-    return * this; }
-
-  bool operator ! ( void ) const
-  { return !p; }
-
-  bool operator == ( sptr_base const & other ) const
-  { return p == other.p; }
-
-  bool operator != ( sptr_base const & other ) const
-  { return p != other.p; }
-
-  ~sptr_base()
-  { reset(); }
-
-protected:
-
-  T * get_base( void ) const
-  { return p; }
-};
-
-template< class T >
-class sptr: public sptr_base< T >
+class sptr: public std::shared_ptr< T >
 {
 public:
 
   sptr() {}
 
-  sptr( T * p ): sptr_base< T >( p ) {}
+  sptr( T * p ): std::shared_ptr< T >( p ) {}
   
   // TT is meant to be a derivative of T
   template< class TT >
-  sptr( sptr< TT > const & other ): sptr_base< T >( other ) {}
-    
-  // Retrieval
-
-  T * get( void ) const
-    { return sptr_base< T > :: get_base(); }
-
-  T * operator -> ( void ) const
-    { return get(); }
-
-  T & operator * ( void ) const
-    { return * get(); }
-
-  // Check
-
-  operator bool( void ) const
-    { return get();  }
-
-  bool operator ! ( void ) const
-    { return !get(); }
+  sptr( sptr< TT > const & other ): std::shared_ptr< T >( other ) {}
 };
 
-template< class T >
-class const_sptr: public sptr_base< T >
-{
-public:
-
-  const_sptr() {}
-
-  const_sptr( T * p_ ): sptr_base< T >( p_ ) {}
-  
-  const_sptr( sptr< T > const & other ): sptr_base< T >( other ) {}
-  
-  // TT is meant to be a derivative of T
-  template< class TT >
-  const_sptr( sptr_base< TT > const & other ): sptr_base< T >( other ) {}
-    
-  // Retrieval
-
-  T const * get( void ) const
-    { return sptr_base< T > :: get_base(); }
-
-  T const * operator -> ( void ) const
-    { return get(); }
-
-  T const & operator * ( void ) const
-    { return * get(); }
-};
-
-
 #endif