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>
  
  // const size_type find_last_not_of(charT c, size_type pos = npos) const;
  
  #include <string_view>
  #include <cassert>
  
  #include "test_macros.h"
  #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_not_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_not_of(c) == x);
      if (x != S::npos)
          assert(x < s.size());
  }
  
  int main()
  {
      {
      typedef std::string_view S;
      test(S(""), 'i', 0, S::npos);
      test(S(""), 'i', 1, S::npos);
      test(S("kitcj"), 'i', 0, 0);
      test(S("qkamf"), 'i', 1, 1);
      test(S("nhmko"), 'i', 2, 2);
      test(S("tpsaf"), 'i', 4, 4);
      test(S("lahfb"), 'i', 5, 4);
      test(S("irkhs"), 'i', 6, 4);
      test(S("gmfhdaipsr"), 'i', 0, 0);
      test(S("kantesmpgj"), 'i', 1, 1);
      test(S("odaftiegpm"), 'i', 5, 4);
      test(S("oknlrstdpi"), 'i', 9, 8);
      test(S("eolhfgpjqk"), 'i', 10, 9);
      test(S("pcdrofikas"), 'i', 11, 9);
      test(S("nbatdlmekrgcfqsophij"), 'i', 0, 0);
      test(S("bnrpehidofmqtcksjgla"), 'i', 1, 1);
      test(S("jdmciepkaqgotsrfnhlb"), 'i', 10, 10);
      test(S("jtdaefblsokrmhpgcnqi"), 'i', 19, 18);
      test(S("hkbgspofltajcnedqmri"), 'i', 20, 18);
      test(S("oselktgbcapndfjihrmq"), 'i', 21, 19);
  
      test(S(""), 'i', S::npos);
      test(S("csope"), 'i', 4);
      test(S("gfsmthlkon"), 'i', 9);
      test(S("laenfsbridchgotmkqpj"), 'i', 19);
      }
  
  #if TEST_STD_VER > 11
      {
      typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
      constexpr SV  sv1;
      constexpr SV  sv2 { "abcde", 5 };
  
      static_assert (sv1.find_last_not_of( 'i', 0 ) == SV::npos, "" );
      static_assert (sv1.find_last_not_of( 'i', 1 ) == SV::npos, "" );
      static_assert (sv2.find_last_not_of( 'a', 0 ) == SV::npos, "" );
      static_assert (sv2.find_last_not_of( 'a', 1 ) == 1, "" );
      static_assert (sv2.find_last_not_of( 'e', 5 ) == 3, "" );
      }
  #endif
  }
  