Compiler Error C2940
'class' : type-class-id redefined as a local typedef
You can't use a generic or template class as a local typedef
.
This error is obsolete in Visual Studio 2022 and later versions.
The following sample generates C2940:
// C2940.cpp
template<class T>
struct TC {};
int main() {
typedef int TC<int>; // C2940
typedef int TC; // OK
}
C2940 can also occur when using generics:
// C2940b.cpp
// compile with: /clr
generic<class T>
ref struct GC { };
int main() {
typedef int GC<int>; // C2940
typedef int GC;
}
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