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2 c++ standard doesn't support overloading based on return type alone, it's because the return type doesn't play a role in determining the function being called The return type is only determined at runtime, and thus it's not part of the function signature which is used by the compiler to decide which function to call. Cannot overload functions distinguished by return type alone because setoverunder function declaration (returns string) doesn't match its definition (returns double). Cannot overload functions distinguished by return type alone asked 11 years, 5 months ago modified 11 years, 5 months ago viewed 8k times I keep getting a cannot overload functions distinguished by return type alone when it comes to my function string processopen (char name) and i'm not sure why. Im trying to let a function in c++ return string but the function name is underline in red (visual studio) and shows cannot overload functions distinguished by return type alone the string operat. Cannot overload functions distinguished by return type alone i know, that it is not perfect, but is there any way to exclude this one function from its checklist or something like this? While technically not overloading by return type, it accomplishes the intent of different return types with the same function name, is valid and clear c++, and has little overhead (a single variable instantiation in the function call). Why am i getting cannot overload functions distinguished by return type alone when i am declaring friend functions in the class? This begs a question on how the initial initconfig () function declaration was checked (by vscode's c/c++ intellisense?) when having the then unknowncustomconfigtype return type. Cannot overload functions distinguished by return type alone i don't understand why, since the operator>> and operator<< that i overload for each of the structs have different parameter types, since the structures are of different type.