type set

[spir]

Hello,

I have a template condition that looks like this:
    T check (T) () if (
            is(T == DLogical) ||
            is(T == DNumber) ||
            is(T == DText) ||
            is(T == DList) ||
            is(T == DUnit)
        ) {
        ...
    }

Is there a way to "factor out" such an expression using a kind of type set? If 
only for cleaning the code; but also because such a set may get long.

    T check (T) () if (is (T in validTypeSet)) {
        ...
    }

Denis
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