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std::ranges..._view::size(3) C++ Standard Libary std::ranges..._view::size(3) NAME std::ranges::drop_view::size - std::ranges::drop_view::size Synopsis constexpr auto size() requires ranges::sized_range<V>; (1) (since C++20) constexpr auto size() const requires ranges::sized_range<const V>; (2) (since C++20) Returns the number of elements. Let base_ be the underlying view, count_ be the stored count (usu- ally the number passed to the constructor, or 0 if *this is default constructed). Equivalent to const auto s = ranges::size(base_); const auto c = static_cast<decltype(s)>(count_); return s < c ? 0 : s - c; Parameters (none) Return value The number of elements. Example // Run this code #include <array> #include <ranges> int main() { constexpr std::array a{42, 43, 44}; static_assert(std::ranges::drop_view{std::views::all(a), 0}.size() == 3); static_assert(std::ranges::drop_view{std::views::all(a), 1}.size() == 2); static_assert(std::ranges::drop_view{std::views::all(a), 2}.size() == 1); static_assert(std::ranges::drop_view{std::views::all(a), 3}.size() == 0); static_assert(std::ranges::drop_view{std::views::all(a), 4}.size() == 0); } 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 2022.07.31 std::ranges..._view::size(3)
NAME | Synopsis | Parameters | Return value | Example | See also
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