#include <memory>

struct Foo
{
  void DoSomething()
  { }
};

void Bar()
{
  std::shared_ptr<Foo> sp_f;
  std::tr1::shared_ptr<Foo> sp_tr1_f;

  // This is found.
  sp_tr1_f->DoSomething();

  // Does not find.
  sp_f->DoSomething();  
}

namespace X
{
  void DoNothing()
  {  }
}

namespace Y
{
  using X::DoNothing;
}

int main()
{
  X::DoNothing();
  // If you find references on the one below it does not find any of the others.
  // If you find references on any of the others it does not find the one below.
  Y::DoNothing();
}