libstdc++-v3/testsuite/27_io/basic_ostringstream/cons/char/1.cc

   1 // Copyright (C) 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 // C++20 29.8.2.2  basic_stringbuf constructors  [stringbuf.cons
  19
  20 // { dg-options "-std=gnu++2a" }
  21 // { dg-do run { target c++2a } }
  22 // { dg-require-effective-target cxx11-abi }
  23
  24 #include <sstream>
  25 #include <string>
  26 #include <testsuite_allocator.h>
  27 #include <testsuite_hooks.h>
  28
  29 void
  30 test01()
  31 {
  32   std::ostringstream::allocator_type a;
  33   std::ostringstream stm(std::ios_base::in, a);
  34 }
  35
  36 auto const cstr = "This is a test string";
  37
  38 void
  39 test02()
  40 {
  41   std::string s1(cstr);
  42   std::ostringstream stm(std::move(s1));
  43   VERIFY( s1.empty() );
  44
  45   std::string s2(cstr);
  46   VERIFY( stm.str() == s2 );
  47 }
  48
  49 void
  50 test03()
  51 {
  52   using alloc_type = __gnu_test::tracker_allocator<char>;
  53   using str_type = std::basic_string<char, std::char_traits<char>, alloc_type>;
  54
  55   auto const mode = std::ios_base::out;
  56   str_type s1(cstr);
  57
  58   {
  59     std::ostringstream::allocator_type a;
  60     std::ostringstream sbuf(s1, mode, a);
  61     std::string s2(cstr);
  62     VERIFY( sbuf.str() == s2 );
  63   }
  64
  65   {
  66     std::ostringstream sbuf(s1, mode);
  67     std::string s2(cstr);
  68     VERIFY( sbuf.str() == s2 );
  69   }
  70
  71   {
  72     std::ostringstream sbuf(s1);
  73     std::string s2(cstr);
  74     VERIFY( sbuf.str() == s2 );
  75   }
  76 }
  77
  78 // A minimal allocator with no default constructor
  79 template<typename T>
  80   struct NoDefaultCons : __gnu_test::SimpleAllocator<T>
  81   {
  82     using __gnu_test::SimpleAllocator<T>::SimpleAllocator;
  83
  84     NoDefaultCons() = delete;
  85
  86     NoDefaultCons(int) { }
  87   };
  88
  89 void
  90 test04()
  91 {
  92   using sstream = std::basic_ostringstream<char, std::char_traits<char>,
  93                                            NoDefaultCons<char>>;
  94
  95   NoDefaultCons<char> a(1);
  96   const std::string str(cstr);
  97
  98   sstream ss1(str, a);
  99   VERIFY( ss1.str() == cstr );
 100
 101   sstream ss2(str, std::ios::in, a);
 102   VERIFY( ss2.str() == cstr );
 103   VERIFY( bool(ss2 << "That") );
 104   VERIFY( ss2.str() == "That is a test string" );
 105
 106   sstream ss3(std::string(str), std::ios::ate, a);
 107   VERIFY( ss3.str() == cstr );
 108   VERIFY( bool(ss3 << "y thing") );
 109   VERIFY( ss3.str() == "This is a test stringy thing" );
 110 }
 111
 112 int
 113 main()
 114 {
 115   test01();
 116   test02();
 117   test03();
 118   test04();
 119 }