auto_handle::auto_handle

 

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The auto_handle constructor.

Syntax

auto_handle();  
auto_handle(  
   _element_type ^ _ptr  
);  
auto_handle(  
   auto_handle<_element_type> % _right  
);  
template<typename _other_type>  
auto_handle(  
   auto_handle<_other_type> % _right  
);  

Parameters

_ptr
The object to own.

_right
An existing auto_handle.

Example

// msl_auto_handle_auto_handle.cpp  
// compile with: /clr  
#include "msclr\auto_handle.h"  
  
using namespace System;  
using namespace msclr;  
ref class RefClassA {  
protected:  
   String^ m_s;     
public:  
   RefClassA(String^ s) : m_s(s) {  
      Console::WriteLine( "in RefClassA constructor: " + m_s );  
   }  
   ~RefClassA() {  
      Console::WriteLine( "in RefClassA destructor: " + m_s );  
   }  
  
   virtual void PrintHello() {  
      Console::WriteLine( "Hello from {0} A!", m_s );  
   }  
};  
  
ref class RefClassB : RefClassA {  
public:     
   RefClassB( String^ s ) : RefClassA( s ) {}  
   virtual void PrintHello() new {  
      Console::WriteLine( "Hello from {0} B!", m_s );  
   }  
};  
  
int main()  
{  
   {  
      auto_handle<RefClassA> a(gcnew RefClassA( "first" ) );  
      a->PrintHello();  
   }  
  
   {  
      auto_handle<RefClassB> b(gcnew RefClassB( "second" ) );  
      b->PrintHello();  
      auto_handle<RefClassA> a(b); //construct from derived type  
      a->PrintHello();  
      auto_handle<RefClassA> a2(a); //construct from same type  
      a2->PrintHello();  
   }  
  
   Console::WriteLine("done");  
}  

in RefClassA constructor: first  
Hello from first A!  
in RefClassA destructor: first  
in RefClassA constructor: second  
Hello from second B!  
Hello from second A!  
Hello from second A!  
in RefClassA destructor: second  
done  

Requirements

Header file <msclr\auto_handle.h>

Namespace msclr

See Also

auto_handle Members
auto_handle::operator=
auto_handle::~auto_handle