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PO"cannot access private member'" error only when class has export linkage
 

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  1. PO"cannot access private member'" error only when class has export linkage
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    <p>I recently had to change the linkage specification of several classes and ran into a problem. Two of the classes contain a <code>std::map</code> with a <code>std::unique_ptr</code> as the value type. After the linkage was changed the compiler started complaining with "cannot access private member declared in class 'std::unique_ptr&lt;_Ty>'" errors.</p> <p>Anyone know why this only happens when an export specification is supplied or have a solution?</p> <p>Sample Code:</p> <pre><code>#include &lt;map&gt; struct SomeInterface { virtual ~SomeInterface() = 0; }; // This class compiles with no problems struct LocalClass { std::map&lt;int, std::unique_ptr&lt;SomeInterface&gt;&gt; mData; }; // This class fails to compile struct __declspec(dllexport) ExportedClass { std::map&lt;int, std::unique_ptr&lt;SomeInterface&gt;&gt; mData; }; </code></pre> <p>Compiler output:</p> <pre><code>c:\program files (x86)\microsoft visual studio 10.0\vc\include\utility(163): error C2248: 'std::unique_ptr&lt;_Ty&gt;::unique_ptr' : cannot access private member declared in class 'std::unique_ptr&lt;_Ty&gt;' with [ _Ty=SomeInterface ] c:\program files (x86)\microsoft visual studio 10.0\vc\include\memory(2347) : see declaration of 'std::unique_ptr&lt;_Ty&gt;::unique_ptr' with [ _Ty=SomeInterface ] c:\program files (x86)\microsoft visual studio 10.0\vc\include\utility(195) : see reference to function template instantiation 'std::_Pair_base&lt;_Ty1,_Ty2&gt;::_Pair_base&lt;const int&amp;,_Ty2&amp;&gt;(_Other1,_Other2)' being compiled with [ _Ty1=const int, _Ty2=std::unique_ptr&lt;SomeInterface&gt;, _Other1=const int &amp;, _Other2=std::unique_ptr&lt;SomeInterface&gt; &amp; ] c:\program files (x86)\microsoft visual studio 10.0\vc\include\xmemory(208) : see reference to function template instantiation 'std::pair&lt;_Ty1,_Ty2&gt;::pair&lt;const _Kty,_Ty&gt;(std::pair&lt;_Ty1,_Ty2&gt; &amp;)' being compiled with [ _Ty1=const int, _Ty2=std::unique_ptr&lt;SomeInterface&gt;, _Kty=int, _Ty=std::unique_ptr&lt;SomeInterface&gt; ] c:\program files (x86)\microsoft visual studio 10.0\vc\include\xmemory(280) : see reference to function template instantiation 'void std::allocator&lt;_Ty&gt;::construct&lt;std::pair&lt;_Ty1,_Ty2&gt;&amp;&gt;(std::pair&lt;_Ty1,_Ty2&gt; *,_Other)' being compiled with [ _Ty=std::pair&lt;const int,std::unique_ptr&lt;SomeInterface&gt;&gt;, _Ty1=const int, _Ty2=std::unique_ptr&lt;SomeInterface&gt;, _Other=std::pair&lt;const int,std::unique_ptr&lt;SomeInterface&gt;&gt; &amp; ] c:\program files (x86)\microsoft visual studio 10.0\vc\include\xtree(592) : see reference to function template instantiation 'void std::_Cons_val&lt;std::allocator&lt;_Ty&gt;,_Ty,std::pair&lt;_Ty1,_Ty2&gt;&amp;&gt;(_Alloc &amp;,std::pair&lt;_Ty1,_Ty2&gt; *,std::pair&lt;_Ty1,_Ty2&gt;)' being compiled with [ _Ty=std::pair&lt;const int,std::unique_ptr&lt;SomeInterface&gt;&gt;, _Ty1=const int, _Ty2=std::unique_ptr&lt;SomeInterface&gt;, _Alloc=std::allocator&lt;std::pair&lt;const int,std::unique_ptr&lt;SomeInterface&gt;&gt;&gt; ] c:\program files (x86)\microsoft visual studio 10.0\vc\include\xtree(1521) : see reference to function template instantiation 'std::_Tree_nod&lt;_Traits&gt;::_Node *std::_Tree_val&lt;_Traits&gt;::_Buynode&lt;std::pair&lt;_Ty1,_Ty2&gt;&amp;&gt;(_Valty)' being compiled with [ _Traits=std::_Tmap_traits&lt;int,std::unique_ptr&lt;SomeInterface&gt;,std::less&lt;int&gt;,std::allocator&lt;std::pair&lt;const int,std::unique_ptr&lt;SomeInterface&gt;&gt;&gt;,false&gt;, _Ty1=const int, _Ty2=std::unique_ptr&lt;SomeInterface&gt;, _Valty=std::pair&lt;const int,std::unique_ptr&lt;SomeInterface&gt;&gt; &amp; ] c:\program files (x86)\microsoft visual studio 10.0\vc\include\xtree(1516) : while compiling class template member function 'std::_Tree_nod&lt;_Traits&gt;::_Node *std::_Tree&lt;_Traits&gt;::_Copy(std::_Tree_nod&lt;_Traits&gt;::_Node *,std::_Tree_nod&lt;_Traits&gt;::_Node *)' with [ _Traits=std::_Tmap_traits&lt;int,std::unique_ptr&lt;SomeInterface&gt;,std::less&lt;int&gt;,std::allocator&lt;std::pair&lt;const int,std::unique_ptr&lt;SomeInterface&gt;&gt;&gt;,false&gt; ] c:\program files (x86)\microsoft visual studio 10.0\vc\include\map(81) : see reference to class template instantiation 'std::_Tree&lt;_Traits&gt;' being compiled with [ _Traits=std::_Tmap_traits&lt;int,std::unique_ptr&lt;SomeInterface&gt;,std::less&lt;int&gt;,std::allocator&lt;std::pair&lt;const int,std::unique_ptr&lt;SomeInterface&gt;&gt;&gt;,false&gt; ] c:\projects\so\so\so.cpp(18) : see reference to class template instantiation 'std::map&lt;_Kty,_Ty&gt;' being compiled with [ _Kty=int, _Ty=std::unique_ptr&lt;SomeInterface&gt; ] </code></pre>
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    1. COAt the very least, this is a purely platform- and compiler-specific problem. C++ doesn't have a standardized ABI, and the effects of `__declspec(declexport)` on a *class* definition are entirely up to the compiler.
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