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From: shane%mishka@RAND.ORG (Darrell)
Newsgroups: gnu.g++.help,comp.lang.c++
Subject: using the ellipsis (...)
Message-ID: <9012112222.AA23214@mishka.rand.org>
Date: 11 Dec 90 22:22:53 GMT
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How would one use va_start when no formal arguments are specified in 
the argument list?  For example suppose I wanted to write a function 
print_strs which would take an arbitrary number strings, terminated by 
a null string, and print them to cout.  


void print_strs(...)
{
  va_list ap;
  va_start(ap, ???);	// what arg should be used in place of ???

  while( 1 )  {
    char *sp = va_arg( ap, char* );
    if ( !sp ) break;
    cout << sp << "\n";
  }
  va_end( ap );
}


This is not the best example since there is no compelling reason not 
to define print_strs with the argument list ( char *sp1 ... ) and use 
sp1 in place of ???.  However, I do have a real need for a virtual 
member function with an ( ... ) argument list.


Thanks,
Darrell Shane