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std::ranges..._view::size(3) C++ Standard Libary std::ranges..._view::size(3) NAME std::ranges::adjacent_transform_view::size - std::ranges::adja- cent_transform_view::size Synopsis constexpr auto size() requires ranges::sized_range<InnerView>; (since C++23) constexpr auto size() const requires ranges::sized_range<const (since C++23) InnerView>; Returns the number of elements. Let inner_ be the underlying object of type InnerView (that is the ranges::adjacent_view<V,N>). 1,2) Equivalent to return inner_.size();. Parameters (none) Return value The number of elements, may be 0 if the size of the underlying view V is less than N. Example // Run this code #include <ranges> int main() { constexpr static auto v = {1, 2, 3, 4, 5, 6}; auto f = [](auto...) { return 0; }; // dummy constexpr int width1 {4}; constexpr auto view1 = v | std::views::adjacent_trans- form<width1>(f); static_assert(view1.size() == 3); static_assert(view1.size() == (v.size() - width1 + 1)); constexpr int width2 {8}; constexpr auto view2 = v | std::views::adjacent_trans- form<width2>(f); // window is too wide, so view2 has no elements: static_assert(view2.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 2024.06.10 std::ranges..._view::size(3)
NAME | Synopsis | Parameters | Return value | Example | See also
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