extern_function_template_imp.h

Go to the documentation of this file.

 
 
// 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;
};
 
template <class T>
S<T> foobar (S<T> s)
{
#if defined (INSTANTIATE)
    s.t = 1;
#else   // if !defined (INSTANTIATE)
    s.t = -1;
#endif   // INSTANTIATE
 
    return s;
}
 
#if defined (INSTANTIATE)
 
template S<int> foobar (S<int>);
 
#else   // if !defined (INSTANTIATE)
 
extern template S<int> foobar (S<int>);
 
#endif   // INSTANTIATE