Template class problem

[lni]

Hi,

I have 3 DLLs that use the same static variable from a template class instance, such as:

1st DLL:

template <typename T>
class Foo {
 
public:
 
  static Foo<T>& instance() {
    static Foo<T> obj;
    return obj;
  }
 
  void add( ... ) {
   ... 
  }
 
};

template <typename T>
class Foo {

public:

  static Foo<T>& instance() {
    static Foo<T> obj;
    return obj;
  }

  void add( ... ) {
   ... 
  }

};

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In 2nd dll, I call

Foo<myClass>::instance().add( ... );

Foo<myClass>::instance().add( ... );

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In 3nd dll, I also call

Foo<myClass>::instance().add( ... );

Foo<myClass>::instance().add( ... );

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In linux things work fine. The Foo<myClass>::instance() contains the 2 items I "add"

However, in Windows, they don't know each other. It appears each has their own "instance". How can I export the instance so all DLLs share it?

Thanks!

[amleto]

Where is your Qt question?
http://lmgtfy.com/?q=c%2B%2B+dll+template+export
http://lmgtfy.com/?q=c%2B%2B+dll+template+extern