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[PATCH] istream_iterator: test for read in ctor


Standard say:

    27.6.1  Class template istream_iterator [istream.iterator]
    1 The class template istream_iterator is an input iterator (27.2.3)
      that reads (using operator>>) successive elements from the input
      stream for which it was constructed.
  ->    After it is constructed, and every time ++ is used, the iterator
  ->    reads and stores a value of T.
    ...

    27.6.1.1 istream_iterator constructors and destructor [istream.iterator.cons]
    ...
      istream_iterator(istream_type& s);
  ->  3 Effects: Initializes in_stream with addressof(s). value may be initialized
  ->    during construction or the first time it is referenced.
    4 Postconditions: in_stream == addressof(s).

Current position is "After it is constructed ... the iterator reads and stores
a value of T.".
---
 .../24_iterators/istream_iterator/81964.cc         | 63 ++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 libstdc++-v3/testsuite/24_iterators/istream_iterator/81964.cc

diff --git a/libstdc++-v3/testsuite/24_iterators/istream_iterator/81964.cc b/libstdc++-v3/testsuite/24_iterators/istream_iterator/81964.cc
new file mode 100644
index 0000000..f2df7e3
--- /dev/null
+++ b/libstdc++-v3/testsuite/24_iterators/istream_iterator/81964.cc
@@ -0,0 +1,63 @@
+// { dg-options "-std=gnu++11" }
+
+// 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/>.
+
+#include <sstream>
+#include <iterator>
+#include <testsuite_hooks.h>
+
+// libstdc++/81964
+void test0x()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+
+  /*
+     27.6.1  Class template istream_iterator [istream.iterator]
+
+      1 The class template istream_iterator is an input iterator (27.2.3)
+        that reads (using operator>>) successive elements from the input
+        stream for which it was constructed.
+    ->    After it is constructed, and every time ++ is used, the iterator
+    ->    reads and stores a value of T.
+      ...
+    
+      27.6.1.1 istream_iterator constructors and destructor [istream.iterator.cons]
+      ...
+        istream_iterator(istream_type& s);
+    ->  3 Effects: Initializes in_stream with addressof(s). value may be initialized
+    ->    during construction or the first time it is referenced.
+      4 Postconditions: in_stream == addressof(s).
+    
+    Current position is "After it is constructed ... the iterator reads and stores
+    a value of T.".
+  */
+
+  std::istringstream s("1 2");
+  std::istream_iterator<int> ii1(s); // read 1
+  std::istream_iterator<int> ii2(s); // read 2
+
+  VERIFY( *ii2 == 2 );
+  VERIFY( *ii1 == 1 );
+}
+
+int main()
+{
+  test0x();
+  return 0;
+}
-- 
2.10.1


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