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Allows types to define a context type. Declaring the parameter then requires that the context be passed in, if and only if there is a context.
I went with
std::monostatefor two reasons. First, it's the "official" type of empty data. As such, it includes such niceties as default and copy constructors. Secondly, as the official empty data type, it will take up zero bytes the moment that that is possible. It also gives the compiler the best opportunity to optimise out the context call in the parameter.