Compiler Error C3857
Visual Studio 2015
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The latest version of this topic can be found at Compiler Error C3857.
type': multiple type parameter lists are not allowed
More than one template or generic was specified for the same type, which is not allowed.
The following sample generates C3857:
// C3857.cpp
template <class T, class TT>
template <class T2> // C3857
struct B {};
Possible resolution:
// C3857b.cpp
// compile with: /c
template <class T, class TT, class T2>
struct B {};
C3857 can also occur when using generics:
// C3857c.cpp // compile with: /clr generic <typename T> generic <typename U> ref class GC; // C3857
Possible resolution:
// C3857d.cpp // compile with: /clr /c generic <typename U> ref class GC;
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