text: // { dg-options "-std=gnu++17" }
  
  // Copyright (C) 2013-2017 Free Software Foundation, Inc.
  //
  // This file is part of the GNU ISO C++ Library.  This library is free
  // software; you can redistribute it and/or modify it under the
  // terms of the GNU General Public License as published by the
  // Free Software Foundation; either version 3, or (at your option)
  // any later version.
  
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  // GNU General Public License for more details.
  
  // You should have received a copy of the GNU General Public License along
  // with this library; see the file COPYING3.  If not see
  // <http://www.gnu.org/licenses/>.
  
  // basic_string non-member functions
  
  // operator==
  /*
  template<class charT, class traits, class Allocator>
    bool operator==(const basic_string<charT,traits,Allocator>& lhs,
                    const basic_string<charT,traits,Allocator>& rhs);
  
  template<class charT, class traits, class Allocator>
    bool operator==(const charT* lhs,
                    const basic_string<charT,traits,Allocator>& rhs);
  
  template<class charT, class traits, class Allocator>
    bool operator==(const basic_string<charT,traits,Allocator>& lhs,
                    const charT* rhs);
  */
  
  // operator!=
  /*
  template<class charT, class traits, class Allocator>
    bool operator!=(const basic_string<charT,traits,Allocator>& lhs,
                    const basic_string<charT,traits,Allocator>& rhs);
  
  template<class charT, class traits, class Allocator>
    bool operator!=(const charT* lhs,
                    const basic_string<charT,traits,Allocator>& rhs);
  
  template<class charT, class traits, class Allocator>
    bool operator!=(const basic_string<charT,traits,Allocator>& lhs, 
                    const charT* rhs);
  */
  
  // operator<
  /*
  template<class charT, class traits, class Allocator>
    bool operator< (const basic_string<charT,traits,Allocator>& lhs,
                    const basic_string<charT,traits,Allocator>& rhs);
  
  template<class charT, class traits, class Allocator>
    bool operator< (const basic_string<charT,traits,Allocator>& lhs,
                    const charT* rhs);
  
  template<class charT, class traits, class Allocator>
    bool operator< (const charT* lhs, 
                    const basic_string<charT,traits,Allocator>& rhs);
  */
  
  // operator>
  /*
  template<class charT, class traits, class Allocator>
    bool operator> (const basic_string<charT,traits,Allocator>& lhs,
                    const basic_string<charT,traits,Allocator>& rhs);
  
  template<class charT, class traits, class Allocator>
    bool operator> (const basic_string<charT,traits,Allocator>& lhs,
                    const charT* rhs);
  
  template<class charT, class traits, class Allocator>
    bool operator> (const charT* lhs,
                    const basic_string<charT,traits,Allocator>& rhs);
  */
  
  // operator<=
  /*
  template<class charT, class traits, class Allocator>
    bool operator<=(const basic_string<charT,traits,Allocator>& lhs,
                    const basic_string<charT,traits,Allocator>& rhs);
  
  template<class charT, class traits, class Allocator>
    bool operator<=(const basic_string<charT,traits,Allocator>& lhs,
                    const charT* rhs);
  
  template<class charT, class traits, class Allocator>
    bool operator<=(const charT* lhs,
                    const basic_string<charT,traits,Allocator>& rhs);
  */
  
  // operator>=
  /*
  template<class charT, class traits, class Allocator>
    bool operator>=(const basic_string<charT,traits,Allocator>& lhs,
                  const basic_string<charT,traits,Allocator>& rhs);
  
  template<class charT, class traits, class Allocator>
    bool operator>=(const basic_string<charT,traits,Allocator>& lhs,
                    const charT* rhs);
  
  template<class charT, class traits, class Allocator>
    bool operator>=(const charT* lhs,
                    const basic_string<charT,traits,Allocator>& rhs);
  */
  
  #include <string_view>
  #include <testsuite_hooks.h>
  
  void
  test01()
  {
    std::string_view 	str_0("costa rica");
    std::string_view 	str_1("costa marbella");
    std::string_view 	str_2("cost");
    std::string_view	str_3("costa ricans");
    std::string_view        str_4;
  
    str_4 = str_0;
    //comparisons between string objects
    VERIFY( !(str_0 == str_1) );
    VERIFY( !(str_0 == str_2) );
    VERIFY( !(str_0 == str_3) );
    VERIFY( !(str_1 == str_0) );
    VERIFY( !(str_2 == str_0) );
    VERIFY( !(str_3 == str_0) );
    VERIFY( str_4 == str_0 );
    VERIFY( str_0 == str_4 );
  
    VERIFY( str_0 != str_1 );
    VERIFY( str_0 != str_2 );
    VERIFY( str_0 != str_3 );
    VERIFY( str_1 != str_0 );
    VERIFY( str_2 != str_0 );
    VERIFY( str_3 != str_0 );
    VERIFY( !(str_0 != str_4) );
    VERIFY( !(str_4 != str_0) );
  
    VERIFY( str_0 > str_1 ); //true cuz r>m
    VERIFY( str_0 > str_2 );
    VERIFY( !(str_0 > str_3) );
    VERIFY( !(str_1 > str_0) ); //false cuz m<r
    VERIFY( !(str_2 > str_0) );
    VERIFY( str_3 > str_0 );
    VERIFY( !(str_0 > str_4) );
    VERIFY( !(str_4 > str_0) );
  
    VERIFY( !(str_0 < str_1) ); //false cuz r>m
    VERIFY( !(str_0 < str_2) );
    VERIFY( str_0 < str_3 );
    VERIFY( str_1 < str_0 ); //true cuz m<r
    VERIFY( str_2 < str_0 );
    VERIFY( !(str_3 < str_0) );
    VERIFY( !(str_0 < str_4) );
    VERIFY( !(str_4 < str_0) );
  
    VERIFY( str_0 >= str_1 ); //true cuz r>m
    VERIFY( str_0 >= str_2 );
    VERIFY( !(str_0 >= str_3) );
    VERIFY( !(str_1 >= str_0) );//false cuz m<r
    VERIFY( !(str_2 >= str_0) );
    VERIFY( str_3 >= str_0 );
    VERIFY( str_0 >= str_4 );
    VERIFY( str_4 >= str_0 );
  
    VERIFY( !(str_0 <= str_1) );//false cuz r>m
    VERIFY( !(str_0 <= str_2) );
    VERIFY( str_0 <= str_3 );
    VERIFY( str_1 <= str_0 );//true cuz m<r
    VERIFY( str_2 <= str_0 );
    VERIFY( !(str_3 <= str_0) );
    VERIFY( str_0 <= str_4 );
    VERIFY( str_4 <= str_0 );
  
    //comparisons between string object and string literal
    VERIFY( !(str_0 == "costa marbella") );
    VERIFY( !(str_0 == "cost") );
    VERIFY( !(str_0 == "costa ricans") );
    VERIFY( !("costa marbella" == str_0) );
    VERIFY( !("cost" == str_0) );
    VERIFY( !("costa ricans" == str_0) );
    VERIFY( "costa rica" == str_0 );
    VERIFY( str_0 == "costa rica" );
  
    VERIFY( str_0 != "costa marbella" );
    VERIFY( str_0 != "cost" );
    VERIFY( str_0 != "costa ricans" );
    VERIFY( "costa marbella" != str_0 );
    VERIFY( "cost" != str_0 );
    VERIFY( "costa ricans" != str_0 );
    VERIFY( !("costa rica" != str_0) );
    VERIFY( !(str_0 != "costa rica") );
  
    VERIFY( str_0 > "costa marbella" ); //true cuz r>m
    VERIFY( str_0 > "cost" );
    VERIFY( !(str_0 > "costa ricans") );
    VERIFY( !("costa marbella" > str_0) );//false cuz m<r
    VERIFY( !("cost" > str_0) );
    VERIFY( "costa ricans" > str_0 );
    VERIFY( !("costa rica" > str_0) );
    VERIFY( !(str_0 > "costa rica") );
  
    VERIFY( !(str_0 < "costa marbella") );//false cuz r>m
    VERIFY( !(str_0 < "cost") );
    VERIFY( str_0 < "costa ricans" );
    VERIFY( "costa marbella" < str_0 );//true cuz m<r
    VERIFY( "cost" < str_0 );
    VERIFY( !("costa ricans" < str_0) );
    VERIFY( !("costa rica" < str_0) );
    VERIFY( !(str_0 < "costa rica") );
  
    VERIFY( str_0 >= "costa marbella" );//true cuz r>m
    VERIFY( str_0 >= "cost" );
    VERIFY( !(str_0 >= "costa ricans") );
    VERIFY( !("costa marbella" >= str_0) );//false cuz m<r
    VERIFY( !("cost" >= str_0) );
    VERIFY( "costa ricans" >= str_0 );
    VERIFY( "costa rica" >= str_0 );
    VERIFY( str_0 >= "costa rica" );
  
    VERIFY( !(str_0 <= "costa marbella") );//false cuz r>m
    VERIFY( !(str_0 <= "cost") );
    VERIFY( str_0 <= "costa ricans" );
    VERIFY( "costa marbella" <= str_0 );//true cuz m<r
    VERIFY( "cost" <= str_0 );
    VERIFY( !("costa ricans" <= str_0) );
    VERIFY( "costa rica" <= str_0 );
    VERIFY( str_0 <= "costa rica" );
  }
  
  constexpr bool
  test02()
  {
    std::string_view 	str_0("costa rica");
    std::string_view 	str_1("costa marbella");
    std::string_view 	str_2("cost");
    std::string_view	str_3("costa ricans");
    std::string_view        str_4;
  
  #undef VERIFY
  #define VERIFY(x) if (!(x)) return false
  
    str_4 = str_0;
    //comparisons between string objects
    VERIFY( !(str_0 == str_1) );
    VERIFY( !(str_0 == str_2) );
    VERIFY( !(str_0 == str_3) );
    VERIFY( !(str_1 == str_0) );
    VERIFY( !(str_2 == str_0) );
    VERIFY( !(str_3 == str_0) );
    VERIFY( str_4 == str_0 );
    VERIFY( str_0 == str_4 );
  
    VERIFY( str_0 != str_1 );
    VERIFY( str_0 != str_2 );
    VERIFY( str_0 != str_3 );
    VERIFY( str_1 != str_0 );
    VERIFY( str_2 != str_0 );
    VERIFY( str_3 != str_0 );
    VERIFY( !(str_0 != str_4) );
    VERIFY( !(str_4 != str_0) );
  
    VERIFY( str_0 > str_1 ); //true cuz r>m
    VERIFY( str_0 > str_2 );
    VERIFY( !(str_0 > str_3) );
    VERIFY( !(str_1 > str_0) ); //false cuz m<r
    VERIFY( !(str_2 > str_0) );
    VERIFY( str_3 > str_0 );
    VERIFY( !(str_0 > str_4) );
    VERIFY( !(str_4 > str_0) );
  
    VERIFY( !(str_0 < str_1) ); //false cuz r>m
    VERIFY( !(str_0 < str_2) );
    VERIFY( str_0 < str_3 );
    VERIFY( str_1 < str_0 ); //true cuz m<r
    VERIFY( str_2 < str_0 );
    VERIFY( !(str_3 < str_0) );
    VERIFY( !(str_0 < str_4) );
    VERIFY( !(str_4 < str_0) );
  
    VERIFY( str_0 >= str_1 ); //true cuz r>m
    VERIFY( str_0 >= str_2 );
    VERIFY( !(str_0 >= str_3) );
    VERIFY( !(str_1 >= str_0) );//false cuz m<r
    VERIFY( !(str_2 >= str_0) );
    VERIFY( str_3 >= str_0 );
    VERIFY( str_0 >= str_4 );
    VERIFY( str_4 >= str_0 );
  
    VERIFY( !(str_0 <= str_1) );//false cuz r>m
    VERIFY( !(str_0 <= str_2) );
    VERIFY( str_0 <= str_3 );
    VERIFY( str_1 <= str_0 );//true cuz m<r
    VERIFY( str_2 <= str_0 );
    VERIFY( !(str_3 <= str_0) );
    VERIFY( str_0 <= str_4 );
    VERIFY( str_4 <= str_0 );
  
    //comparisons between string object and string literal
    VERIFY( !(str_0 == "costa marbella") );
    VERIFY( !(str_0 == "cost") );
    VERIFY( !(str_0 == "costa ricans") );
    VERIFY( !("costa marbella" == str_0) );
    VERIFY( !("cost" == str_0) );
    VERIFY( !("costa ricans" == str_0) );
    VERIFY( "costa rica" == str_0 );
    VERIFY( str_0 == "costa rica" );
  
    VERIFY( str_0 != "costa marbella" );
    VERIFY( str_0 != "cost" );
    VERIFY( str_0 != "costa ricans" );
    VERIFY( "costa marbella" != str_0 );
    VERIFY( "cost" != str_0 );
    VERIFY( "costa ricans" != str_0 );
    VERIFY( !("costa rica" != str_0) );
    VERIFY( !(str_0 != "costa rica") );
  
    VERIFY( str_0 > "costa marbella" ); //true cuz r>m
    VERIFY( str_0 > "cost" );
    VERIFY( !(str_0 > "costa ricans") );
    VERIFY( !("costa marbella" > str_0) );//false cuz m<r
    VERIFY( !("cost" > str_0) );
    VERIFY( "costa ricans" > str_0 );
    VERIFY( !("costa rica" > str_0) );
    VERIFY( !(str_0 > "costa rica") );
  
    VERIFY( !(str_0 < "costa marbella") );//false cuz r>m
    VERIFY( !(str_0 < "cost") );
    VERIFY( str_0 < "costa ricans" );
    VERIFY( "costa marbella" < str_0 );//true cuz m<r
    VERIFY( "cost" < str_0 );
    VERIFY( !("costa ricans" < str_0) );
    VERIFY( !("costa rica" < str_0) );
    VERIFY( !(str_0 < "costa rica") );
  
    VERIFY( str_0 >= "costa marbella" );//true cuz r>m
    VERIFY( str_0 >= "cost" );
    VERIFY( !(str_0 >= "costa ricans") );
    VERIFY( !("costa marbella" >= str_0) );//false cuz m<r
    VERIFY( !("cost" >= str_0) );
    VERIFY( "costa ricans" >= str_0 );
    VERIFY( "costa rica" >= str_0 );
    VERIFY( str_0 >= "costa rica" );
  
    VERIFY( !(str_0 <= "costa marbella") );//false cuz r>m
    VERIFY( !(str_0 <= "cost") );
    VERIFY( str_0 <= "costa ricans" );
    VERIFY( "costa marbella" <= str_0 );//true cuz m<r
    VERIFY( "cost" <= str_0 );
    VERIFY( !("costa ricans" <= str_0) );
    VERIFY( "costa rica" <= str_0 );
    VERIFY( str_0 <= "costa rica" );
  
    return true;
  }
  
  int
  main()
  {
    test01();
    static_assert( test02() );
  }
  