Compiler Error C2039
'identifier1' : is not a member of 'identifier2'
The code incorrectly calls or refers to a member of a structure, class, or union.
Examples
The following sample generates C2039:
// C2039.cpp
struct S {
int mem0;
} s, *pS = &s;
int main() {
pS->mem1 = 0; // C2039 mem1 is not a member
pS->mem0 = 0; // OK
}
The following sample generates C2039:
// C2039_b.cpp
// compile with: /clr
using namespace System;
int main() {
Console::WriteLine( "{0}", DateTime::get_Now()); // C2039
Console::WriteLine( "{0}", DateTime::Now); // OK
Console::WriteLine( "{0}", DateTime::Now::get()); // OK
}
The following sample generates C2039:
// C2039_c.cpp
// compile with: /clr /c
ref struct S {
property int Count {
int get();
void set(int i){}
};
};
int S::get_Count() { return 0; } // C2039
int S::Count::get() { return 0; } // OK
C2039 can also occur if you attempt to access a default indexer incorrectly. To demonstrate, this code defines a C# component that is used by the C++/CLI code that follows:
// C2039_d.cs
// compile with: /target:library
// a C# program
[System.Reflection.DefaultMember("Item")]
public class B {
public int Item {
get { return 13; }
set {}
}
};
The following sample generates C2039 when it uses the previously defined C# component's default indexer incorrectly from C++/CLI:
// C2039_e.cpp
// compile with: /clr
using namespace System;
#using "c2039_d.dll"
int main() {
B ^ b = gcnew B;
int n = b->default; // C2039
// try the following line instead
// int n = b->Item;
Console::WriteLine(n);
}
C2039 can also occur if you use generics. The following sample generates C2039:
// C2039_f.cpp
// compile with: /clr
interface class I {};
ref struct R : public I {
virtual void f3() {}
};
generic <typename T>
where T : I
void f(T t) {
t->f3(); // C2039
safe_cast<R^>(t)->f3(); // OK
}
int main() {
f(gcnew R());
}
C2039 can occur when you try to release managed or unmanaged resources. For more information, see Destructors and finalizers.
The following sample generates C2039:
// C2039_g.cpp
// compile with: /clr
using namespace System;
using namespace System::Threading;
void CheckStatus( Object^ stateInfo ) {}
int main() {
ManualResetEvent^ event = gcnew ManualResetEvent( false );
TimerCallback^ timerDelegate = gcnew TimerCallback( &CheckStatus );
Timer^ stateTimer = gcnew Timer( timerDelegate, event, 1000, 250 );
((IDisposable ^)stateTimer)->Dispose(); // C2039
stateTimer->~Timer(); // OK
}