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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)
       noexcept	{
	    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		  2022.07.31	  std::basic_..._view::npos(3)

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