std::basic_string_view::find_last_of(3)

NAME
std::basic_string_view::find_last_of - std::basic_string_view::find_last_of

Synopsis
   constexpr size_type find_last_of( basic_string_view v, size_type (1) (since C++17)
   pos = npos ) const noexcept;
   constexpr size_type find_last_of( CharT c, size_type pos = npos ) (2) (since C++17)
   const noexcept;
   constexpr size_type find_last_of( const CharT* s, size_type pos, (3) (since C++17)
   size_type count ) const;
   constexpr size_type find_last_of( const CharT* s, size_type pos = (4) (since C++17)
   npos ) const;
   Finds the last character equal to one of characters in the given character sequence.
   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 occurence of any of the characters of v in this view, ending at
   position pos.
   2) Equivalent to find_last_of(basic_string_view(std::addressof(c), 1), pos).
   3) Equivalent to find_last_of(basic_string_view(s, count), pos).
   4) Equivalent to find_last_of(basic_string_view(s), pos).

Parameters
   v - view to search for
   pos - position at which the search is to finish
   count - length of the string of characters to search for
   s - pointer to a string of characters to search for
   ch - character to search for

Return value
   Position of the last occurrence of any character of the substring, or npos if no
   such character is found.

Complexity
   O(size() * v.size()) at worst.

Example
// Run this code
 #include <string_view>
 #include <iostream>
 int main()
 {
   using namespace std::literals;
   constexpr auto N = std::string_view::npos;
   static_assert(
     5 == "delete"sv.find_last_of("cdef"sv) &&
       // └────────────────────┘
     N == "double"sv.find_last_of("fghi"sv) &&
       //
     0 == "else"sv.find_last_of("bcde"sv, 2 /* pos [0..2]: "els" */) &&
       // └────────────────────────┘
     N == "explicit"sv.find_last_of("abcd"sv, 4 /* pos [0..4]: "expli" */) &&
       //
     3 == "extern"sv.find_last_of('e') &&
       // └────────────────────┘
     N == "false"sv.find_last_of('x') &&
       //
     0 == "inline"sv.find_last_of('i', 2 /* pos [0..2]: "inl" */) &&
       // └───────────────────────┘
     N == "mutable"sv.find_last_of('a', 2 /* pos [0..2]: "mut" */) &&
       //
     3 == "namespace"sv.find_last_of("cdef", 3 /* pos [0..3]: "name" */, 3 /* "cde" */) &&
       // └─────────────────────────┘
     N == "namespace"sv.find_last_of("cdef", 3 /* pos [0..3]: "name" */, 2 /* "cd" */)
   );
   std::cout << "All tests passed.\n";
 }

Output:
 All tests passed.

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