Eclipse header indexer did not handle the operator->* correctly. So
rename the function from operator->* to eval can resolve the Eclipse
false alert.

This reverts commit c97927f.

Eclipse indexer did not handle the ->* operator correctly and display
error in the editor, whereas it actually is not a bug. Changing the
operator from operator->* to operator+ can resolve this problem.

Proof of concept:
Prority 3   operator+       Right-to-left
Prority 4   operator->*     Left-to-right

where:
__catchResult+expr

Supported operator in expr:
Prority 3   +
Prority 3   -
Prority 3   /
Prority 3   *
Prority 13   &&
*STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison
Prority 14   ||
*STATIC_ASSERT_Expression_Too_Complex_Please_Rewrite_As_Binary_Comparison

__catchResult + _1Obj   operand1 _2Obj .... _NObj
=> (__catchResult + _1Obj) operand1 _2Obj .... _NObj
=> ExpressionLhs<T>        operand1 _2Obj .... _NObj
Hence, the change is OK