libstdc++-v3/testsuite/25_algorithms/copy_n/istreambuf_iterator/1.cc

   1 // Copyright (C) 2019-2020 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do run { target c++11 } }
  19
  20 #include <algorithm>
  21 #include <sstream>
  22 #include <iterator>
  23
  24 #include <testsuite_hooks.h>
  25
  26 void test01()
  27 {
  28   std::stringstream ss("12345");
  29
  30   std::string ostr(5, '0');
  31   typedef std::istreambuf_iterator<char> istrb_ite;
  32   auto res = std::copy_n(istrb_ite(ss), 0, ostr.begin());
  33   VERIFY( res == ostr.begin() );
  34   VERIFY( ostr.front() == '0' );
  35
  36   res = std::copy_n(istrb_ite(ss), 2, ostr.begin());
  37   VERIFY( res == ostr.begin() + 2 );
  38   VERIFY( ostr == "12000" );
  39
  40   res = std::copy_n(istrb_ite(ss), 3, ostr.begin() + 2);
  41   VERIFY( res == ostr.begin() + 5 );
  42   VERIFY( ostr == "12345" );
  43 }
  44
  45 void test02()
  46 {
  47   std::stringstream ss("12345");
  48
  49   std::string ostr(5, '0');
  50   typedef std::istreambuf_iterator<char> istrb_ite;
  51
  52   istrb_ite ibfit(ss);
  53   auto res = std::copy_n(ibfit, 3, std::copy_n(ibfit, 2, ostr.begin()));
  54   VERIFY( res == ostr.begin() + 5 );
  55   VERIFY( ostr == "12345" );
  56 }
  57
  58 void test03()
  59 {
  60   std::string ostr(5, '0');
  61   typedef std::istreambuf_iterator<char> istrb_ite;
  62
  63   auto res = std::copy_n(istrb_ite(), 0, ostr.begin());
  64   VERIFY( res == ostr.begin() );
  65 }
  66
  67 int main()
  68 {
  69   test01();
  70   test02();
  71   test03();
  72   return 0;
  73 }