Why is #define bad and what is the proper substitute?

Question

#define dItemName        L\"CellPhone\"

Answer 1

One major problem with #define is that it is outside of the language itself and therefore is not limited to a given scope. You will replace dItemName anywhere in the translation unit, in all namespaces, classes, functions, etc.

I'd replace it with const std::wstring dItemName = L"CellPhone";