libstdc++-v3/testsuite/27_io/fpos/14320-1.cc

   1 // 2004-03-02  Petur Runolfsson  <peturr02@ru.is>
   2
   3 // Copyright (C) 2004-2024 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // 27.4.3 fpos
  21
  22 // { dg-do compile }
  23 // { dg-require-effective-target hosted }
  24
  25 #include <limits>
  26 #include <iterator>
  27
  28 // libstdc++/14320
  29
  30 typedef std::istreambuf_iterator<char>::difference_type Distance;
  31
  32 #if __cplusplus >= 201103L
  33   static_assert( std::is_integral<Distance>::value, "integral type" );
  34   static_assert( std::is_signed<Distance>::value, "signed integral type" );
  35 #else
  36 template<typename> struct SignedInteger { enum { value = 0 }; };
  37 // The C++ standard didn't originally have "long long", however that
  38 // type is in the C++11 standard and testing for it allows
  39 // ilp32 targets to pass this test when `Distance' is 64 bits.
  40 template<> struct SignedInteger<long long int> { enum { value = 1 }; };
  41 template<> struct SignedInteger<long int> { enum { value = 1 }; };
  42 template<> struct SignedInteger<int> { enum { value = 1 }; };
  43 template<> struct SignedInteger<short int> { enum { value = 1 }; };
  44 template<> struct SignedInteger<char> {
  45   enum { value = std::numeric_limits<char>::is_signed };
  46 };
  47 template<> struct SignedInteger<wchar_t> {
  48   enum { value = std::numeric_limits<wchar_t>::is_signed };
  49 };
  50
  51 char assertion[SignedInteger<Distance>::value ? 1 : -1];
  52 #endif