text: //===----------------------------------------------------------------------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  
  // <string>
  
  // constexpr size_type find_first_of(charT c, size_type pos = 0) 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_first_of(c, pos) == x);
      if (x != S::npos)
          assert(pos <= x && x < s.size());
  }
  
  template <class S>
  void
  test(const S& s, typename S::value_type c, typename S::size_type x)
  {
      assert(s.find_first_of(c) == x);
      if (x != S::npos)
          assert(x < s.size());
  }
  
  int main(int, char**)
  {
      {
      typedef std::string_view S;
      test(S(""), 'e', 0, S::npos);
      test(S(""), 'e', 1, S::npos);
      test(S("kitcj"), 'e', 0, S::npos);
      test(S("qkamf"), 'e', 1, S::npos);
      test(S("nhmko"), 'e', 2, S::npos);
      test(S("tpsaf"), 'e', 4, S::npos);
      test(S("lahfb"), 'e', 5, S::npos);
      test(S("irkhs"), 'e', 6, S::npos);
      test(S("gmfhdaipsr"), 'e', 0, S::npos);
      test(S("kantesmpgj"), 'e', 1, 4);
      test(S("odaftiegpm"), 'e', 5, 6);
      test(S("oknlrstdpi"), 'e', 9, S::npos);
      test(S("eolhfgpjqk"), 'e', 10, S::npos);
      test(S("pcdrofikas"), 'e', 11, S::npos);
      test(S("nbatdlmekrgcfqsophij"), 'e', 0, 7);
      test(S("bnrpehidofmqtcksjgla"), 'e', 1, 4);
      test(S("jdmciepkaqgotsrfnhlb"), 'e', 10, S::npos);
      test(S("jtdaefblsokrmhpgcnqi"), 'e', 19, S::npos);
      test(S("hkbgspofltajcnedqmri"), 'e', 20, S::npos);
      test(S("oselktgbcapndfjihrmq"), 'e', 21, S::npos);
  
      test(S(""), 'e', S::npos);
      test(S("csope"), 'e', 4);
      test(S("gfsmthlkon"), 'e', S::npos);
      test(S("laenfsbridchgotmkqpj"), 'e', 2);
      }
  
  #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_first_of( 'e', 0 ) == SV::npos, "" );
      static_assert (sv1.find_first_of( 'e', 1 ) == SV::npos, "" );
      static_assert (sv2.find_first_of( 'q', 0 ) == SV::npos, "" );
      static_assert (sv2.find_first_of( 'e', 1 ) == 4, "" );
      static_assert (sv2.find_first_of( 'e', 5 ) == SV::npos, "" );
      }
  #endif
  
    return 0;
  }
  