extern_template_imp.h

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// avoid including <config.h> here to avoid inadvertently
// trying to introduce dependencies on other config tests
// that the config infrastructure won't know about (since
// it only searches .cpp files for them)
// #include <config.h>
 
#if __GNUG__ >= 3
   // disable gcc 3.x (and beyond) error: ISO C++ forbids the use
   // of `extern' on explicit instantiations
#  pragma GCC system_header
#endif   // gcc >= 3
 
 
template <class T>
struct S
{
    T t;
 
    T foo () const;
 
    T bar () const;
 
    T baz () const {
        return bar ();
    }
 
    template <class U>
    U inline_member_template (U) const {
        return U ();
    }
 
    template <class U>
    U member_template (U) const;
};
 
template <class T>
inline T S<T>::bar () const
{
    return foo ();
}
 
template <class T>
T S<T>::foo () const
{
#if defined (INSTANTIATE)
    return 1;
#else   // if !defined (INSTANTIATE)
    return 0;
#endif   // INSTANTIATE
}
 
template <class T>
template <class U>
U S<T>::member_template (U) const
{
    return U ();
}
 
 
#if defined (INSTANTIATE)
 
template struct S<int>;
 
#else   // if !defined (INSTANTIATE)
 
extern template struct S<int>;
 
#endif   // INSTANTIATE