[Boost-bugs] [Boost C++ Libraries] #10488: Compilation of serializing shared_ptr<const Object> fails

Subject: [Boost-bugs] [Boost C++ Libraries] #10488: Compilation of serializing shared_ptr<const Object> fails
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-09-10 12:53:39

#10488: Compilation of serializing shared_ptr<const Object> fails
-------------------------------------------------+-------------------------
 Reporter:  visa.jokelainen@…                    |      Owner:  ramey
     Type:  Bugs                                 |     Status:  new
Milestone:  To Be Determined                     |  Component:
  Version:  Boost 1.56.0                         |  serialization
 Keywords:  shared_ptr serialization const       |   Severity:  Regression
  compilation                                    |
-------------------------------------------------+-------------------------
 Compilation of code that includes serialization of shared_ptr<const
 Object> fails with Boost 1.56.0 with error:

 {{{
 /usr/include/boost/smart_ptr/shared_ptr.hpp:323:25: note:   no known
 conversion for argument 1 from ‘const boost::shared_ptr<const TestClass>’
 to ‘const boost::shared_ptr<void>&’
 }}}

 This works with Boost 1.55.0 and earlier versions.
 Tested on Arch Linux with clang 3.4.2 and g++ 4.9.1.

 Here's a little test to replicate the problem:

 {{{
 #include <fstream>

 #include <boost/archive/text_iarchive.hpp>
 #include <boost/serialization/shared_ptr.hpp>

 #include <boost/make_shared.hpp>


 class TestClass
 {
 public:

     TestClass(int i) : _i(i) {}

 private:

     friend class boost::serialization::access;

     TestClass() {}

     template<class Archive>
     void serialize(Archive & ar, const unsigned int version)
     {
         ar & _i;
     }

     int _i;
 };

 typedef boost::shared_ptr<TestClass> ClassPtr;
 typedef boost::shared_ptr<const TestClass> ConstClassPtr;

 int main(int argc, char* argv[])
 {
     ClassPtr ptr = boost::make_shared<TestClass>(13);
     ConstClassPtr cPtr = boost::make_shared<const TestClass>(42);

     {
         std::ifstream ifs("test");
         boost::archive::text_iarchive ia(ifs);

         ia >> ptr; // This works

         ia >> cPtr; // This doesn't
     }

     return 0;
 }
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/10488>
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