home | help 
std::ranges...m_view::size(3)  C++ Standard Libary std::ranges...m_view::size(3)

NAME
     std::ranges::transform_view::size - std::ranges::transform_view::size

Synopsis
	constexpr      auto	 size()     requires	 ranges::sized_range<V>;
     (since C++20)
	constexpr  auto  size()  const	requires  ranges::sized_range<const  V>;
     (since C++20)

	Returns the number of elements.

	Returns ranges::size(base_), where base_ is the underlying view.

Parameters
	(none)

Return value
	The number of elements.

Notes
	If  V does not model forward_range, size() might not be well-defined af-
     ter a call to
	begin().

Example
     // Run this code

      #include <cctype>
      #include <iostream>
      #include <ranges>
      #include <string>

      int main()
      {
	  std::string s{"The length of this string is 42 characters"};
	  auto tv = std::ranges::transform_view{s, [](char c) -> char
	  {
	      return std::toupper(c);
	  }};
	  for (auto x : tv)
	      std::cout << x;
	  std::cout << "\nsize = " << tv.size() << '\n';
      }

Output:
      THE LENGTH OF THIS STRING IS 42 CHARACTERS
      size = 42

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...m_view::size(3)
home | help