Assume the existence of a File class with boolean data member, isValid, indicati

Question

Assume the existence of a File class with boolean data member, isValid, indicating the file is ready for I/O. Write a unary operator, !, that accepts a constant File reference, and returns true if the file is not ready for I/O and false otherwise. My Code: bool File operator !(bool File& isValid) { if(isValid) { return (!isValid); } else { return (isValid); } } Error Message: CTest.cpp:3: error: expected ';' before 'operator' CTest.cpp:15: error: expected `;' at end of input CTest.cpp:15: error: expected `}' at end of input CTest.cpp:15: error: expected unqualified-id at end of input I'm kind of stumped, the book doesn't cover this in any real detail (a paragraph or two at most) so I'm not sure what the correct C++ syntax is. I imagine it shouldn't be hard for anyone who has real exprience in C++

Explanation / Answer

this works in CodeLab:

bool operator!() { return !isValid;};

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