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
  //
  //===----------------------------------------------------------------------===//
  // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
  
  // <string_view>
  
  //   constexpr bool starts_with(charT x) const noexcept;
  
  #include <string_view>
  #include <cassert>
  
  #include "test_macros.h"
  #include "constexpr_char_traits.hpp"
  
  int main(int, char**)
  {
      {
      typedef std::string_view SV;
      SV  sv1 {};
      SV  sv2 { "abcde", 5 };
  
      ASSERT_NOEXCEPT(sv1.starts_with('e'));
  
      assert (!sv1.starts_with('a'));
      assert (!sv1.starts_with('x'));
      assert ( sv2.starts_with('a'));
      assert (!sv2.starts_with('x'));
      }
  
  #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.starts_with('a'), "" );
      static_assert (!sv1.starts_with('x'), "" );
      static_assert ( sv2.starts_with('a'), "" );
      static_assert (!sv2.starts_with('x'), "" );
      }
  #endif
  
    return 0;
  }
  