transform_join

Takes a function from range_reference_t<Range> to some T that models range. Transforms the given range by calling the function on each element, joining all `T`s into a single range.

std::vector<int> vec{ 0,1,2 };
auto f = [](auto i) { return std::vector<int>{i,i,i}; };

for (auto&& e : vec | tl::views::transform_join(f)) {
   std::cout << e << ' ';
   //0 0 0 1 1 1 2 2 2
}

tl::transform_join_view does not exist: tl::views::transform_join is implemented in terms of other range adaptors.

constexpr inline auto tl::views::transform_join

template<class V, class F>
constexpr auto operator()(V &&range, F f) const

Requires: viewable_range<V> && transformable_view<V, F> && (joinable_view<std::ranges::transform_view<std::views::all_t<V>, F>> || joinable_view<tl::cache_latest_view<std::ranges::transform_view<std::views::all_t<V>, F>>>)

The returned type has the following properties:

Reference: range_reference_t<range_reference_t<V>>

Category: At most bidirectional.

Sized: Never.

Common: When V is common and range_reference_t<V> is common.

Const-iterable: Never.

Borrowed: Never.

template<class V, class F>
constexpr auto operator()(F f) const

Partial application for piping, e.g. ranges | tl::views::transform_join(func).