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* [Bug libstdc++/16021] New: Tests for container swap specialisations FAIL in debug mode
@ 2004-06-16 12:15 redi at gcc dot gnu dot org
  2004-06-17  2:04 ` [Bug libstdc++/16021] " redi at gcc dot gnu dot org
                   ` (11 more replies)
  0 siblings, 12 replies; 18+ messages in thread
From: redi at gcc dot gnu dot org @ 2004-06-16 12:15 UTC (permalink / raw)
  To: gcc-bugs

All testsuite/23_containers/*/modifiers/swap.cc files FAIL to compile
when _GLIBCXX_DEBUG is defined.

The following code is adapted from the testsuite:

    #define _GLIBCXX_DEBUG
    #include <vector>

    struct T { int i; };

    int swap_calls;

    namespace std
    {
      template<>
        void
        vector<T, allocator<T> >::swap(vector<T, allocator<T> >&)
        { ++swap_calls; }
    }

    // Should use vector specialization for swap.
    int main()
    {
      std::vector<T> A;
      std::vector<T> B;
      swap_calls = 0;
      std::swap(A, B);
      return swap_calls;
    }

Compiling this gives:

swap.cc:12: error: `allocator' was not declared in this scope
swap.cc:12: error: template argument 2 is invalid
swap.cc:12: error: variable or field `swap' declared void
swap.cc:12: error: `int __gnu_debug_def::vector<T, std::allocator<T> >::swap' is
 not a static member of `class __gnu_debug_def::vector<T, std::allocator<T> >'
swap.cc:12: error: expected primary-expression before ')' token
swap.cc:13: error: expected `;' before '{' token

The same error happens for all containers on 3.4 and mainline.

The diagnostic is confusing, it first says allocator is not found, then
identifies it as std::allocator in another diagnostic that seems to think
the member function is static.

A solution is to qualify allocator as std::allocator, but this shouldn't
be necessary because _GLIBCXX_DEBUG shouldn't change the meaning of any
conforming program.

I *think* what might be happening is that in debug mode the "std"
namespace is really "__gnu_debug" and the (non-debug) standard library
is really in "_GLIBCXX_STD". This means that the unqualified name
"allocator" looks up in __gnu_debug and the global namespace, and so
doesn't find "_GLIBCXX_STD::allocator". But I don't think I've got that
quite right.

-- 
           Summary: Tests for container swap specialisations FAIL in debug
                    mode
           Product: gcc
           Version: 3.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: redi at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16021


^ permalink raw reply	[flat|nested] 18+ messages in thread
[parent not found: <bug-16021-5876@http.gcc.gnu.org/bugzilla/>]
end of thread, other threads:[~2006-02-28  9:27 UTC | newest]

Thread overview: 18+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2004-06-16 12:15 [Bug libstdc++/16021] New: Tests for container swap specialisations FAIL in debug mode redi at gcc dot gnu dot org
2004-06-17  2:04 ` [Bug libstdc++/16021] " redi at gcc dot gnu dot org
2004-06-28 20:11 ` bangerth at dealii dot org
2004-06-30 14:41 ` redi at gcc dot gnu dot org
2004-06-30 15:22 ` bangerth at dealii dot org
2004-06-30 17:32 ` giovannibajo at libero dot it
2004-06-30 17:36 ` bangerth at dealii dot org
2004-06-30 19:33 ` [Bug c++/16021] " bangerth at dealii dot org
2004-08-02 18:52 ` mmitchel at gcc dot gnu dot org
2004-08-29 18:55 ` mmitchel at gcc dot gnu dot org
2004-11-01  0:46 ` mmitchel at gcc dot gnu dot org
2005-02-12 22:33 ` pinskia at gcc dot gnu dot org
2005-05-19 17:30 ` mmitchel at gcc dot gnu dot org
     [not found] <bug-16021-5876@http.gcc.gnu.org/bugzilla/>
2005-11-17 17:18 ` jason at gcc dot gnu dot org
2005-11-17 18:14 ` jason at gcc dot gnu dot org
2005-11-21  2:12 ` gdr at gcc dot gnu dot org
2006-01-26 22:29 ` jason at gcc dot gnu dot org
2006-02-28  9:28 ` gdr at gcc dot gnu dot org

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