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[Bug libstdc++/14528] [3.4/3.5 Regression] trouble with auto_ptr

From: reichelt at gcc dot gnu dot org
Subject: [Bug libstdc++/14528] [3.4/3.5 Regression] trouble with auto_ptr
Date: 12 Mar 2004 09:21:57 -0000

------- Additional Comments From reichelt at gcc dot gnu dot org  2004-03-12 
09:21 -------
The problem is basically an auto_ptr problem which can be demonstrated
with the following code snippet:


typedef const std::auto_ptr<int> A;

void foo(const A&);

A makeA();

void bar()
    A a; foo(a);  // OK
    foo(A());     // error
    foo(makeA()); // error - the same as in line 45994 of the original example

The problem is, that you need a copy for the temporary (which can be
eliminated, but in theory you need it). With the current implementation
of auto_ptr this is not supplied.

I don't know whether this is correct or a flaw in our auto_ptr
implementation, or even a flaw in the standard. (See PR 14254/3247
for a related issue that came up with stricter checking of the temporary.)

Can a libstdc++ guru provide some insight, please?

           What    |Removed                     |Added
          Component|c++                         |libstdc++
            Summary|[3.4/3.5 Regression]        |[3.4/3.5 Regression] trouble
                   |compiling Boost.Python test |with auto_ptr

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