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std::basic_..._view::npos(3)   C++ Standard Libary  std::basic_..._view::npos(3)

NAME
     std::basic_string_view::npos - std::basic_string_view::npos

Synopsis
	static constexpr size_type npos = size_type(-1);  (since C++17)

	This  is a special value equal to the maximum value representable by the
     type
	size_type. The exact meaning depends on context,  but  it  is  generally
     used either as
	end  of  view  indicator by the functions that expect a view index or as
     the error
	indicator by the functions that return a view index.

Example
     // Run this code

      #include <string_view>

      constexpr bool
      contains(std::string_view const what, std::string_view const where)  noex-
     cept
      {
	  return std::string_view::npos != where.find(what);
      }

      int main()
      {
	  using namespace std::literals;

	  static_assert(contains("water", "in a bottle of water"));
	  static_assert(!contains("wine", "in a bottle of champagne"));
	  static_assert(""sv.npos == "haystack"sv.find("needle"));
      }

See also
	npos	 special value. The exact meaning depends on the context
	[static] (public static member constant of
		 std::basic_string<CharT,Traits,Allocator>)

http://cppreference.com 	   2024.06.10	    std::basic_..._view::npos(3)
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