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std::ranges..._view::size(3)   C++ Standard Libary  std::ranges..._view::size(3)

NAME
     std::ranges::common_view::size - std::ranges::common_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.

	Equivalent to return ranges::size(base_);, where base_ is the underlying
     view.

Parameters
	(none)

Return value
	The number of elements.

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 = { "a<section>"sv, "a""sv, "a"sv, "a"sv };
	  static_assert(std::ranges::views::common(v2).size() == 4);
      }

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)
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