EXTERN_TEMPLATE.cpp

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// checking for extern template extension
 
 
// include a file containing the definition of a template
// and an extern template directive referencing an explicit
// instantiation of the same template in extern_template_imp.o
 
#include "extern_template_imp.h"
 
// establish a dependency on extern_template_imp.o to make sure
// the extern_template_imp.cpp is compiled before this file
#ifndef _RWSTD_NO_extern_template_imp
 
// link with the object file below
// LDOPTS = extern_template_imp.o
 
#endif   // _RWSTD_NO_extern_template_imp
 
int main ()
{
    // each of the member function of S<int> is defined to return 1
    // when explicitly instantiated in extern_template_imp.cpp but
    // to return 0 when #included here
 
    S<int> s;
 
    int res = 0;
 
    // verify that calls to inline member functions defined in
    // the body of the template, inline member functions defined
    // outside the body of the template, and out-of-line member
    // functions all compile and link
    res += s.foo ();
    res += s.bar ();
    res += s.baz ();
 
    // verify that the calls ultimately resolve to the definition
    // emitted by the explicit instantiation in extern_template_imp.o
    // and not the one here
    return !(3 == res);
}