auto_gcroot::operator=
The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.
The latest version of this topic can be found at auto_gcroot::operator=.
Assignment operator.
Syntax
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