from: http://msdn2.microsoft.com/en-us/library/k4fyzf6a(vs.80).aspx
Visual C++ Concepts: Building a C/C++ Program
Compiler Error C2801
Error Message
'operator operator' must be a non-static member
The following operators can be overloaded only as nonstatic members:
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Assignment =
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Class member access ->
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Subscripting []
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Function call ()
Possible C2801 causes:
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Overloaded operator is not a class, structure, or union member.
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Overloaded operator is declared static.
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The following sample generates C2801:
