[FEATURE] support kumi::map without a return type about kumi HOT 5 CLOSED

map is basically transform. I think you want to call for_each : https://godbolt.org/z/vz9Gqdavr

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In this case I have a zip-like thing happening and really do want map-like functionality.

std::vector<int> a, b, c, d;
kumi::tuple l = { std::ref(a), std::ref(b) };
kumi::tuple r = {std::ref(c), std::ref(d) };
kumi::map([](auto&& l, auto&& r) {
    return l[0] = r[0]; // don't want to return
}, l, r);

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It's possible that this should just be a separate function named zip_with.

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I fail to see how

kumi::map([](auto&& l, auto&& r) {
    return l[0] = r[0]; // don't want to return
    }, l, r);

is not:

kumi::for_each([](auto&& l, auto&& r) {
   l[0] = r[0];
 }, l, r);

Is that you want it to be called map? I mean, it's not rly map.

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If for_each supports zipping then that’s what I want. I don’t want map, that was my original complaint.

I’m unfamiliar with the use of algorithms called for_each that provide this zip functionality. I think it’s more traditionally called zip_with. Now I know what kumi calls it is though, I’m happy.

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