Apply the first valid function of a set of N functions

Question

This previous answer shows how to apply function based on the validity of a call: here. However, it applies to two functions. I was wondering if the concept could be general

Answer 1

Use boost::hana::overload_linearly:

hana::overload_linearly(f1, f2, f3)(a, b, c, d, e)

If none of the expressions are valid, it's a compile error, but it's easy to make it do nothing in that case:

hana::overload_linearly(f1, f2, f3, [](auto&&...) {})(a, b, c, d, e)

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Alternatively, use boost::hof::first_of, which does the same thing