3.cc

Mac OS X 10.4.9 for x86 Source Code gcc 实现源代码

// Copyright (C) 2004 Free Software Foundation
//
// 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 2, 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 COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.

// 27.6.1.2.3 character extractors

#include <istream>
#include <sstream>
#include <testsuite_hooks.h>

void test01() 
{
  bool test __attribute__((unused)) = true;
  std::wstring str_01;
  const std::wstring str_02(L"coltrane playing 'softly as a morning sunrise'");
  const std::wstring str_03(L"coltrane");

  std::wstringbuf isbuf_01(std::ios_base::in);
  std::wstringbuf isbuf_02(str_02, std::ios_base::in);
  std::wistream is_01(NULL);
  std::wistream is_02(&isbuf_02);

  std::ios_base::iostate state1, state2, statefail;
  statefail = std::ios_base::failbit;

  // template<_CharT, _Traits>
  //  basic_istream& operator>>(istream&, _CharT*)
  int n = 20;
  wchar_t array1[n];
  typedef std::wios::traits_type ctraits_type;

  // testing with width() control enabled.
  is_02.width(8);
  state1 = is_02.rdstate();
  is_02 >> array1;   // should snake L"coltran"
  state2 = is_02.rdstate();
  VERIFY( state1 == state2 );
  VERIFY( !ctraits_type::compare(array1, L"coltran", 7) );

  is_02.width(1);
  state1 = is_02.rdstate();
  is_02 >> array1;   // should snake nothing, set failbit
  state2 = is_02.rdstate();
  VERIFY( state1 != state2 );
  VERIFY( state2 == statefail );
  VERIFY( array1[0] == L'\0' );

  is_02.width(8);
  is_02.clear();
  state1 = is_02.rdstate();
  VERIFY( !state1 );
  is_02 >> array1;   // should snake L"e"
  state2 = is_02.rdstate();
  VERIFY( state1 == state2 );
  VERIFY( !ctraits_type::compare(array1, L"e", 1) );

  // testing for correct exception setting
  const std::wstring str_04(L"   impulse!!");
  std::wstringbuf isbuf_03(str_04, std::ios_base::in);
  std::wstringbuf isbuf_04(str_04, std::ios_base::in);
  std::wistream is_03(&isbuf_03);
  std::wistream is_04(&isbuf_04);

  is_03 >> array1;
  VERIFY( !ctraits_type::compare(array1, L"impulse!!", 10) );
  VERIFY( is_03.rdstate() == std::ios_base::eofbit );

  is_04.width(9);
  is_04 >> array1;
  VERIFY( !ctraits_type::compare(array1, L"impulse!", 9) );
  VERIFY( !is_04.rdstate() ); 
}

int main()
{
  test01();
  return 0;
}