templated operators by glDaher

// in foo.h template< typename _Ty > struct foo     {     void operator ()( const _Ty& _Type ) const;     }; // in foo.cpp #include "foo.h" template<typename _Ty> void foo<_Ty>::operator()( const _Ty& _Type ) const     {     } // in main.cpp #include "foo.h" int main()     {     foo<int> Foo;     Foo( 5 );     } // linker error: error LNK2019: unresolved external symbol "public: void __thiscall foo<int>::operator()(int const &)const " (??R?$foo@H@@QBEXABH@Z) referenced in function _main