Dear experts,

With the introduction of deducing this in C++23, variants in C++26 will have a member visit P2637R3, which is a great feature.

I wonder, is it good to also add member apply to tuple-like objects? For example:

   auto sum = std::tuple{0, 'a'}.apply(std::plus{});

   auto dist  = ranges::subrange{...}.apply([](auto i, auto s) { return s - i; });

Is this consistency superfluous, or does it have some value? One benefit I can think of is that this enables us to write the form of

  

   tuple.apply(...).apply(...).apply(...).apply(...)

which may be an enhancement. What do you think?

Hewill