我想要一个终止的生成器,比如 python,但我无法从ranges::views::generate
的接口判断是否支持。
You can roll it by hand easily enough: https://godbolt.org/z/xcGz6657r although it's probably better to use a coroutine generator if you have one available.
You can return an optional in the generator, and stop taking elements when a std::nullopt
is generated with views::take_while
auto out = ranges::views::generate(
[i = 0]() mutable -> std::optional<int>
{
if (i > 3)
return std::nullopt;
return { i++ };
})
| ranges::views::take_while([](auto opt){ return opt.has_value();})
;
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