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_);, where base_ is the underlying view.
(none).
The number of elements.
#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);
}|
(C++20) | returns an integer equal to the size of a range (customization point object) |
|
(C++20) | returns a signed integer equal to the size of a range (customization point object) |
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https://en.cppreference.com/w/cpp/ranges/common_view/size