std::ranges::common_view<V>::size
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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. Equivalent to return ranges::size (base_ );.
[edit] Return value
The number of elements.
[edit] Example
Run this code
#include <ranges> #include <string_view> int main() { constexpr static auto v1 = {1, 2, 3, 4, 5}; constexpr auto common1{v1 | std::views::common }; static_assert(common1.size() == 5); constexpr auto take3{v1 | std::views::reverse | std::views::take (3)}; constexpr auto common2{take3 | std::views::common }; static_assert(common2.size() == 3); using namespace std::literals; constexpr static auto v2 = {"∧"sv, "∨"sv, "∃"sv, "∀"sv}; static_assert(std::ranges::views::common (v2).size() == 4); }