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>
  
  // const charT* data() const;
  //       charT* data();   // C++17
  
  #include <string.hxx>
  #include <cassert.hxx>
  
  #include "test_macros.h"
  #include "min_allocator.h"
  
  template <class S>
  void
  test_const(const S& s)
  {
      typedef typename S::traits_type T;
      const typename S::value_type* str = s.data();
      if (s.size() > 0)
      {
          assert(T::compare(str, &s[0], s.size()) == 0);
          assert(T::eq(str[s.size()], typename S::value_type()));
      }
      else
          assert(T::eq(str[0], typename S::value_type()));
  }
  
  template <class S>
  void
  test_nonconst(S& s)
  {
      typedef typename S::traits_type T;
      typename S::value_type* str = s.data();
      if (s.size() > 0)
      {
          assert(T::compare(str, &s[0], s.size()) == 0);
          assert(T::eq(str[s.size()], typename S::value_type()));
      }
      else
          assert(T::eq(str[0], typename S::value_type()));
  }
  
  int main(int, char**)
  {
      {
      typedef std::string S;
      test_const(S(""));
      test_const(S("abcde"));
      test_const(S("abcdefghij"));
      test_const(S("abcdefghijklmnopqrst"));
      }
  #if TEST_STD_VER >= 11
      {
      typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
      test_const(S(""));
      test_const(S("abcde"));
      test_const(S("abcdefghij"));
      test_const(S("abcdefghijklmnopqrst"));
      }
  #endif
  #if TEST_STD_VER > 14
      {
      typedef std::string S;
      S s1("");                     test_nonconst(s1);
      S s2("abcde");                test_nonconst(s2);
      S s3("abcdefghij");           test_nonconst(s3);
      S s4("abcdefghijklmnopqrst"); test_nonconst(s4);
      }
  #endif
  
    return 0;
  }
  