text: //===----------------------------------------------------------------------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is dual licensed under the MIT and the University of Illinois Open
  // Source Licenses. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  
  // <string_view>
  
  // constexpr size_type find_last_of(charT c, size_type pos = npos) const;
  
  #include <experimental/string_view>
  #include <cassert>
  
  #include "constexpr_char_traits.hpp"
  
  template <class S>
  void
  test(const S& s, typename S::value_type c, typename S::size_type pos,
       typename S::size_type x)
  {
      assert(s.find_last_of(c, pos) == x);
      if (x != S::npos)
          assert(x <= pos && x < s.size());
  }
  
  template <class S>
  void
  test(const S& s, typename S::value_type c, typename S::size_type x)
  {
      assert(s.find_last_of(c) == x);
      if (x != S::npos)
          assert(x < s.size());
  }
  
  int main()
  {
      {
      typedef std::experimental::string_view S;
      test(S(""), 'm', 0, S::npos);
      test(S(""), 'm', 1, S::npos);
      test(S("kitcj"), 'm', 0, S::npos);
      test(S("qkamf"), 'm', 1, S::npos);
      test(S("nhmko"), 'm', 2, 2);
      test(S("tpsaf"), 'm', 4, S::npos);
      test(S("lahfb"), 'm', 5, S::npos);
      test(S("irkhs"), 'm', 6, S::npos);
      test(S("gmfhdaipsr"), 'm', 0, S::npos);
      test(S("kantesmpgj"), 'm', 1, S::npos);
      test(S("odaftiegpm"), 'm', 5, S::npos);
      test(S("oknlrstdpi"), 'm', 9, S::npos);
      test(S("eolhfgpjqk"), 'm', 10, S::npos);
      test(S("pcdrofikas"), 'm', 11, S::npos);
      test(S("nbatdlmekrgcfqsophij"), 'm', 0, S::npos);
      test(S("bnrpehidofmqtcksjgla"), 'm', 1, S::npos);
      test(S("jdmciepkaqgotsrfnhlb"), 'm', 10, 2);
      test(S("jtdaefblsokrmhpgcnqi"), 'm', 19, 12);
      test(S("hkbgspofltajcnedqmri"), 'm', 20, 17);
      test(S("oselktgbcapndfjihrmq"), 'm', 21, 18);
  
      test(S(""), 'm', S::npos);
      test(S("csope"), 'm', S::npos);
      test(S("gfsmthlkon"), 'm', 3);
      test(S("laenfsbridchgotmkqpj"), 'm', 15);
      }
  
  #if _LIBCPP_STD_VER > 11
      {
      typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
      constexpr SV  sv1;
      constexpr SV  sv2 { "abcde", 5 };
  
      static_assert (sv1.find_last_of( 'i', 0 ) == SV::npos, "" );
      static_assert (sv1.find_last_of( 'i', 1 ) == SV::npos, "" );
      static_assert (sv2.find_last_of( 'a', 0 ) == 0, "" );
      static_assert (sv2.find_last_of( 'a', 1 ) == 0, "" );
      static_assert (sv2.find_last_of( 'e', 5 ) == 4, "" );
      }
  #endif
  }
  