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std::ranges...m_view::size(3) C++ Standard Libarystd::ranges...m_view::size(3) NAME std::ranges::zip_transform_view::size - std::ranges::zip_trans- form_view::size Synopsis constexpr auto size() (1) (since C++23) requires ranges::sized_range</*InnerView*/>; constexpr auto size() const (2) (since C++23) requires ranges::sized_range<const /*InnerView*/> Returns the number of elements in the zip_transform_view. Provided only if each underlying (adapted) range satisfies sized_range. 1,2) Equivalent to: return zip_.size();. 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 <functional> #include <iostream> #include <ranges> #include <vector> int main() { auto x = std::vector{1, 2, 3, 4, 5}; auto y = std::deque<short>{10, 20, 30}; auto z = std::forward_list{100., 200.}; auto v1 = std::views::zip_transform(std::plus{}, x, y); assert(v1.size() == std::min(x.size(), y.size())); assert(v1.size() == 3); for (int i : v1) std::cout << i << ' '; std::cout << '\n'; [[maybe_unused]] auto v2 = std::views::zip_transform(std::plus{}, x, z); // auto sz = v2.size(); // Error: z doesn't have size(), so neither does v2 static_assert(not std::ranges::sized_range<decltype(z)>); } Output: 11 22 33 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...m_view::size(3)
NAME | Synopsis | Parameters | Return value | Example | Output: | See also
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