auto_gcroot::operator=

Assignment operator.

auto_gcroot<_element_type> & operator=(
   _element_type _right
);
auto_gcroot<_element_type> & operator=(
   auto_gcroot<_element_type> & _right
);
template<typename _other_type>
auto_gcroot<_element_type> & operator=(
   auto_gcroot<_other_type> & _right
);

Parameters

• _right
  The object or auto_gcroot to be assigned to the current auto_gcroot.

Return Value

The current auto_gcroot, now owning _right.

Example

// msl_auto_gcroot_operator_equals.cpp
// compile with: /clr
#include <msclr\auto_gcroot.h>

using namespace System;
using namespace msclr;

ref class ClassA {
protected:
   String^ m_s;   
public:
   ClassA(String^ s) : m_s(s) {
      Console::WriteLine( "in ClassA constructor: " + m_s );
   }
   ~ClassA() {
      Console::WriteLine( "in ClassA destructor: " + m_s );
   }

   virtual void PrintHello() {
      Console::WriteLine( "Hello from {0} A!", m_s );
   }
};

ref class ClassB : ClassA {
public:   
   ClassB( String^ s ) : ClassA( s ) {}
   virtual void PrintHello() new {
      Console::WriteLine( "Hello from {0} B!", m_s );
   }
};

int main()
{
   auto_gcroot<ClassA^> a;
   auto_gcroot<ClassA^> a2(gcnew ClassA( "first" ) );
   a = a2; // assign from same type
   a->PrintHello();

   ClassA^ ha = gcnew ClassA( "second" );
   a = ha; // assign from raw handle

   auto_gcroot<ClassB^> b(gcnew ClassB( "third" ) );   
   b->PrintHello();
   a = b; // assign from derived type   
   a->PrintHello();

   Console::WriteLine("done");
}

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

Requirements

Header file <msclr\auto_gcroot.h>

Namespace msclr

See Also

Concepts

auto_gcroot Members

auto_gcroot::attach