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std::ranges...e_view::size(3) C++ Standard Libarystd::ranges...e_view::size(3) NAME std::ranges::enumerate_view::size - std::ranges::enumerate_view::size Synopsis constexpr auto size() requires ranges::sized_range<V>; (1) (since C++23) constexpr auto size() const requires ranges::sized_range<const V>; (2) (since C++23) Returns the number of elements. Equivalent to return ranges::size(base_);, where base_ is the underlying view. Parameters (none) Return value The number of elements. Example // Run this code #include <cassert> #include <forward_list> #include <ranges> #include <string_view> int main() { constexpr static auto v1 = {1, 2, 3, 4, 5}; constexpr auto ev1{v1 | std::views::enumerate}; static_assert(ev1.size() == 5); static_assert(std::ranges::sized_range<decltype(v1)>); auto v2 = std::forward_list{1, 2, 3, 4, 5}; auto ev2 {v2 | std::views::enumerate}; static_assert(not std::ranges::sized_range<decltype(v2)>); // auto size = ev2.size(); // Error: v2 is not a sized range assert(std::ranges::distance(v2) == 5); // OK, distance does not require sized // range, but has O(N) complexity here } 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...e_view::size(3)
NAME | Synopsis | Parameters | Return value | Example | See also
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