PR libstdc++/81381 support stateful allocators in basic_stringbuf

	PR libstdc++/81381
	* include/bits/sstream.tcc (basic_stringbuf::overflow)
	(basic_stringbuf::basic_stringbuf(const __string_type&, ios::mode))
	(basic_stringbuf::str()): Construct new strings with an allocator.
	* testsuite/27_io/basic_stringbuf/cons/81381.cc: New.

From-SVN: r250101

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 58adb85608b416d74a54d2b33e2ec8507d7a6982..25e3aed5b0ff0bc6449eb8973d693bddf733eaeb 100644 (file)
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,11 @@
 2017-07-10  Jonathan Wakely  <jwakely@redhat.com>
 
+       PR libstdc++/81381
+       * include/bits/sstream.tcc (basic_stringbuf::overflow)
+       (basic_stringbuf::basic_stringbuf(const __string_type&, ios::mode))
+       (basic_stringbuf::str()): Construct new strings with an allocator.
+       * testsuite/27_io/basic_stringbuf/cons/81381.cc: New.
+
        PR libstdc++/81338
        * include/bits/basic_string.h [_GLIBCXX_USE_CXX11_ABI] (basic_string):
        Declare basic_stringbuf to be a friend.

diff --git a/libstdc++-v3/include/bits/sstream.tcc b/libstdc++-v3/include/bits/sstream.tcc
index fc2fcb8992daf8dadfa521fc7dfbb363c9d06afc..56c53bc5923c5d93768cbe5ccbb08b42ce3f8fe5 100644 (file)
--- a/libstdc++-v3/include/bits/sstream.tcc
+++ b/libstdc++-v3/include/bits/sstream.tcc
@@ -129,7 +129,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
          const __size_type __opt_len = std::max(__size_type(2 * __capacity),
                                                 __size_type(512));
          const __size_type __len = std::min(__opt_len, __max_size);
-         __string_type __tmp;
+         __string_type __tmp(_M_string.get_allocator());
          __tmp.reserve(__len);
          if (this->pbase())
            __tmp.assign(this->pbase(), this->epptr() - this->pbase());

diff --git a/libstdc++-v3/include/std/sstream b/libstdc++-v3/include/std/sstream
index 7690252b3e320e87c5e1ae21baa4cd90ac4dfdcc..e84b60c64173652186b11ccdfa6ce1f0ffcf45d3 100644 (file)
--- a/libstdc++-v3/include/std/sstream
+++ b/libstdc++-v3/include/std/sstream
@@ -112,7 +112,8 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
       explicit
       basic_stringbuf(const __string_type& __str,
                      ios_base::openmode __mode = ios_base::in | ios_base::out)
-      : __streambuf_type(), _M_mode(), _M_string(__str.data(), __str.size())
+      : __streambuf_type(), _M_mode(),
+       _M_string(__str.data(), __str.size(), __str.get_allocator())
       { _M_stringbuf_init(__mode); }
 
 #if __cplusplus >= 201103L
@@ -165,14 +166,14 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
       __string_type
       str() const
       {
-       __string_type __ret;
+       __string_type __ret(_M_string.get_allocator());
        if (this->pptr())
          {
            // The current egptr() may not be the actual string end.
            if (this->pptr() > this->egptr())
-             __ret = __string_type(this->pbase(), this->pptr());
+             __ret.assign(this->pbase(), this->pptr());
            else
-             __ret = __string_type(this->pbase(), this->egptr());
+             __ret.assign(this->pbase(), this->egptr());
          }
        else
          __ret = _M_string;

diff --git a/libstdc++-v3/testsuite/27_io/basic_stringbuf/cons/81381.cc b/libstdc++-v3/testsuite/27_io/basic_stringbuf/cons/81381.cc
new file mode 100644 (file)
index 0000000..865449d
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_stringbuf/cons/81381.cc
@@ -0,0 +1,42 @@
+// Copyright (C) 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/>.
+
+// { dg-do run { target c++11 } }
+
+// PR libstdc++/81381
+
+#include <memory>
+#include <sstream>
+#include <testsuite_allocator.h>
+
+using Alloc = __gnu_test::uneq_allocator<char>;
+using String = std::basic_string<char, std::char_traits<char>, Alloc>;
+
+struct SB : std::basic_stringbuf<char, std::char_traits<char>, Alloc>
+{
+  SB(const String& s) : basic_stringbuf(s) { }
+
+  using basic_stringbuf::overflow;
+};
+
+int main()
+{
+  String s(Alloc(23));
+  SB b(s);
+  b.overflow('a');
+  VERIFY( b.str().get_allocator() == s.get_allocator() );
+}