Databases
StackOverflow2013
Postsdbo
POOperator = is not a member of exported C++ __interface in DLL
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POOperator = is not a member of exported C++ __interface in DLL
    primarykey
    data
    text
    <p>I have been writing some code for a lib and experimented with a default Win32 console application to get everything running. Since I have completed all classes I wanted to extract everything into a DLL and therefore I started the adaptation with the usual macro:</p> <pre><code>#ifdef MYLIB_EXPORTS #define DllExport __declspec(dllexport) #else #define DllExport __declspec(dllimport) #endif </code></pre> <p>I am using one interface in my code which is defined like this:</p> <pre><code>__interface DllExport ISerializable { void Serialize(/* ... */); /* some other methods */ }; </code></pre> <p>And this has worked while gaving this code in my exe. In the DLL I get an error during compilation which states</p> <pre><code>error C2039: '=' : is not a member of 'MyLib::ISerializable' error C2664: 'MyLib::DerivedClass::operator =' : cannot convert parameter 1 from 'const MyLib::ISerializable' to 'const MyLib::DerivedClass &amp;' </code></pre> <p>for every class which inherits <code>ISerializable</code> to implement the required methods. (I am using <code>std::shared_ptr&lt;ISerializable&gt;</code> a few times to have abstraction in my code.) However when I change <code>__interface</code> to <code>class</code> and make all methods pure virtual I do not get this error and compilation succeeds.</p> <p><strong>Why do I get this error? Why does my class/interface in my DLL need the assignment operator? Is there any workaround?</strong></p> <p><em>(Using Visual Studio 2012 RTM on Windows 8 RTM with C++11.)</em></p> <hr> <p>Here is one segment where this error occurs (error point always to the last <code>}</code> of the class):</p> <pre><code>class DllExport Tile final : public ISerializable { public: __declspec(property(get=GetIsPassable, put=SetIsPassable)) bool IsPassable; __declspec(property(get=GetTileId, put=SetTileId)) uint16_t TileId; bool&amp; GetIsPassable() { return this-&gt;_IsPassable; } void SetIsPassable(bool val) { this-&gt;_IsPassable = val; } uint16_t&amp; GetTileId() { return this-&gt;_TileId; } void SetTileId(uint16_t val) { this-&gt;_TileId = val; } bool _IsPassable; uint16_t _TileId; void Serialize(OutputFileStream&amp; ofs); size_t TellSize(); size_t Unserialize(InputFileStream&amp; ifs, size_t metadata = 0); }; </code></pre> <p>This error also occurs in a class where I have a property like in the <code>Tile</code> class where I use a <code>std::shared_ptr&lt;ISerializable&gt;</code>.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USChristian Ivicevic
    1. USChristian Ivicevic
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POOperator = is not a member of exported C++ __interface in DLL
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POOperator = is not a member of exported C++ __interface in DLL
      1. This table or related slice is empty.
      1. VTUpMod
    1. COBased on the error message, I would say your problem has nothing to do with DLLs or `dllexport`/`dllimport`.
      singulars
      1. POOperator = is not a member of exported C++ __interface in DLL
      1. USBen Voigt
    2. COThis exact code of the interface worked when having it directly in a usual Win32 Console Project. This error occurs since having the code in a DLL project.
      singulars
      1. POOperator = is not a member of exported C++ __interface in DLL
      1. USChristian Ivicevic
    3. COAn interface doesn't have a copy constructor or assignment operator like a class does. One abstraction too many perhaps. Post the actual code that fails to compile.
      singulars
      1. POOperator = is not a member of exported C++ __interface in DLL
      1. USHans Passant
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload