How to properly transmit a `decltype(auto)` variable from a function?

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To properly transmit a decltype(auto) variable from a function, you can use either auto or decltype to declare the variable in the receiving function.

For example, in the sending function, you can have:

decltype(auto) var = some_function();
return var;

And in the receiving function, you can have:

auto var2 = sending_function();

or

decltype(var) var2 = sending_function();

Either way, the decltype(auto) variable will be correctly transmitted and stored in the receiving function as auto or with the same type as the original variable using decltype.