std::ranges::zip_transform_view<F,Views...>:: size

#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(); // エラー: z が size() を持たないため、v2 も持たない
    static_assert(not std::ranges::sized_range<decltype(z)>);
}