inline constexpr /* unspecified */ all = /* unspecified */;
(1) (since C++20) (2) (since C++20) [edit] Example#include <iostream> #include <ranges> #include <type_traits> #include <vector> int main() { std::vector<int> v{0, 1, 2, 3, 4, 5}; for (int n : std::views::all(v) | std::views::take(2)) std::cout << n << ' '; std::cout << '\n'; static_assert(std::is_same< decltype(std::views::single(42)), std::ranges::single_view<int> >{}); static_assert(std::is_same< decltype(std::views::all(v)), std::ranges::ref_view<std::vector<int, std::allocator<int>>> >{}); int a[]{1, 2, 3, 4}; static_assert(std::is_same< decltype(std::views::all(a)), std::ranges::ref_view<int[4]> >{}); static_assert(std::is_same< decltype(std::ranges::subrange{std::begin(a) + 1, std::end(a) - 1}), std::ranges::subrange<int*, int*, std::ranges::subrange_kind(1)> >{}); }
Output:
[edit] Defect reportsThe following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR Applied to Behavior as published Correct behavior LWG 3724 C++20views::all
might result in hard error for some move-only views it gets well-constrained P2415R2 C++20 views::all
returned a subrange
for a non-view
rvalue range
returns an owning_view
for it [edit] See also
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