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std::basic_...find_last_of(3) C++ Standard Libarystd::basic_...find_last_of(3)

NAME
       std::basic_string::find_last_of - std::basic_string::find_last_of

Synopsis
	  size_type find_last_of( const		       (until
	  basic_string&	str,			       C++11)
	  size_type pos	= npos ) const;
	  constexpr size_type find_last_of(	       (since
	  const	basic_string& str,		       C++11)
	  size_type pos	= npos ) const		       (until
	  noexcept;				       C++20)
	  size_type find_last_of( const	CharT*
	  s,						       (until
	  size_type pos, size_type count )		       C++11)
	  const;
	  constexpr size_type find_last_of(
	  const	CharT* s,				       (since
	  size_type pos, size_type count )		       C++11)
	  const;
	  size_type find_last_of( const	CharT*			       (until
	  s, size_type pos = npos ) const;			       C++20)
	  constexpr size_type find_last_of(			       (since
	  const	CharT* s, size_type pos	= npos			       C++20)
	  ) const;
	  size_type		find_last_of(		  CharT		   ch,
       (until
	  size_type	   pos	       =	 npos	      )		const;
       C++11)
	  size_type	   find_last_of(	CharT	     ch,	   (1)
       (since
	  size_type	    pos		=	  npos	       )	 const
       C++11)
	  noexcept;
       (until
									       C++20)
	  constexpr size_type find_last_of(	   (2)
	  CharT								   ch,
       (since
	  size_type	    pos		=	  npos	       )	 const
       C++20)
	  noexcept;
	  template < class StringViewLike >	       (3)

	  size_type							   (4)
       (since
	  find_last_of(			const		       StringViewLike&
       C++17)
	  t,
       (until
										       C++20)
	  size_type pos	= npos ) const
	  noexcept(/* see below	*/);				       (5)
	  template < class StringViewLike >

	  constexpr size_type
	  find_last_of(			 const		       StringViewLike&
       (since
	  t,
       C++20)

	  size_type pos	= npos ) const
	  noexcept(/* see below	*/);

	  Finds	the last character equal to one	of  characters	in  the	 given
       character sequence.
	  The  exact  search  algorithm	is not specified. The search considers
       only the	interval
	  [0, pos]. If the character is	not present in the interval, npos will
       be returned.

	  1) Finds the last character equal to one of characters in str.
	  2) Finds the last character equal to one of characters in range  [s,
       s+count). This
	  range	can include null characters.
	  3)  Finds the	last character equal to	one of characters in character
       string pointed
	  to by	s. The length of the string is determined by  the  first  null
       character using
	  Traits::length(s).
	  4) Finds the last character equal to ch.
	  5)  Implicitly  converts  t  to  a  string view sv as	if by std::ba-
       sic_string_view<CharT,
	  Traits> sv = t;, then	finds the last character equal to one of char-
       acters in sv.
	  This overload	participates in	overload resolution only if
	  std::is_convertible_v<const	     StringViewLike&,	      std::ba-
       sic_string_view<CharT, Traits>>
	  is   true  and  std::is_convertible_v<const  StringViewLike&,	 const
       CharT*> is false.

	  In all cases,	equality is checked by calling Traits::eq.

Parameters
	  str	- string identifying characters	to search for
	  pos	- position at which the	search is to finish
	  count	- length of character string identifying characters to	search
       for
	  s	 -  pointer  to	 a  character string identifying characters to
       search for
	  ch	- character to search for
	  t	- object (convertible to  std::basic_string_view)  identifying
       characters to
		  search for

Return value
	  Position  of	the  found  character  or npos if no such character is
       found.

Exceptions
	  5)
	  noexcept specification:
	  noexcept(std::is_nothrow_convertible_v<const	    T&,	      std::ba-
       sic_string_view<CharT,
	  Traits>>)

Example
       // Run this code

	#include<string>
	#include<iostream>
	int main()
	{
	    const std::string path="/root/config";
	    auto const pos=path.find_last_of('/');
	    const auto leaf=path.substr(pos+1);

	    std::cout << leaf << '\n';
	}

Output:
	config

	 Defect	reports

	  The following	behavior-changing defect reports were applied retroac-
       tively to
	  previously published C++ standards.

	     DR	       Applied	   to		   Behavior    as    published
       Correct behavior
	  LWG 2064 C++11      overload (3) and (4)  were  noexcept	   re-
       moved
	  LWG	2946  C++17	  string_view  overload	 causes	 ambiguity  in
       avoided by making it a
			      some  cases				  tem-
       plate
	  P1148R0   C++11	noexcept  for overload (4)/(5) was	   re-
       stored
		   C++17      accidently dropped by LWG2064/LWG2946

See also
	  find		    find characters in the string
			    (public member function)
	  rfind		    find the last occurrence of	a substring
			    (public member function)
	  find_first_of	    find first occurrence of characters
			    (public member function)
	  find_first_not_of find first absence of characters
			    (public member function)
	  find_last_not_of  find last absence of characters
			    (public member function)
	  find_last_of	    find last occurrence of characters
	  (C++17)	       (public	  member    function	of    std::ba-
       sic_string_view<CharT,Traits>)

http://cppreference.com		  2022.07.31	 std::basic_...find_last_of(3)

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