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std::ranges...p_view::size(3) C++ Standard Libarystd::ranges...p_view::size(3) NAME std::ranges::zip_view::size - std::ranges::zip_view::size Synopsis constexpr auto size() (1) (since C++23) requires (ranges::sized_range<Views> && ...); constexpr auto size() const (2) (since C++23) requires (ranges::sized_range<const Views> && ...); Returns the number of elements in the zip_view. Provided only if each underlying (adapted) range satisfies sized_range. Equivalent to: return std::apply ( [](auto... sizes) { using CT = /*make-unsigned-like-t*/<std::common_type_t<de- cltype(sizes)...>>; return ranges::min({CT(sizes)...}); }, /*tuple-transform*/(ranges::size, views_) ); Parameters (none) Return value The number of elements, which is the minimum size among all sizes of adapted views. Example // Run this code #include <algorithm> #include <cassert> #include <deque> #include <forward_list> #include <ranges> #include <vector> int main() { auto x = std::vector{1, 2, 3, 4, 5}; auto y = std::deque{'a', 'b', 'c'}; auto z = std::forward_list{1., 2.}; auto v1 = std::views::zip(x, y); assert(v1.size() == std::min(x.size(), y.size())); assert(v1.size() == 3); [[maybe_unused]] auto v2 = std::views::zip(x, z); // auto sz = v2.size(); // Error, v2 does not have size(): static_assert(not std::ranges::sized_range<decltype(z)>); } See also ranges::size returns an integer equal to the size of a range (C++20) (customization point object) ranges::ssize returns a signed integer equal to the size of a range (C++20) (customization point object) http://cppreference.com 2024.06.10 std::ranges...p_view::size(3)
NAME | Synopsis | Parameters | Return value | Example | See also
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