C++ : Overloading operator[] and NOT getting 'lvalue required as left operand of assignment' error

C++ : Overloading operator[] and NOT getting "lvalue required as left operand of assignment" error
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C++ : Overloading operator[] and NOT getting "lvalue required as left operand of assignment" error
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of assignment" as Overloading and required "lvalue error operand getting : C++ NOT operator[] left