no matching function

[Roger Collins]

 
I'm trying to build 
PWLIB of OpenH323 using gcc 3.0 and would like help interpreting an error 
message.  Here's the message:
 
In file 
included from 
/elmer/elmer16/rcollins/pwlib/include/ptlib/unix/ptlib/svcproc.h:63,                  
from 
/elmer/elmer16/rcollins/pwlib/include/ptclib/httpsvc.h:133 ,                  
from 
../../ptclib/httpsvc.cxx:219: /elmer/elmer16/rcollins/pwlib/include/ptlib/svcproc.h: 
In constructor    
`PSystemLog::PSystemLog(PSystemLog::Level)': /elmer/elmer16/rcollins/pwlib/include/ptlib/svcproc.h:139: 
no matching function    for call to `std::basic_iostream<char, 
std::char_traits<char>    
>::basic_iostream()' /elmer/elmer4/rcollins/gcc3/dist/include/g++-v3/bits/std_iosfwd.h:65: 
candidates    are: std::basic_iostream<char, 
std::char_traits<char>    >::basic_iostream(const 
<anonymous>**, const std::basic_iostream<char,    
std::char_traits<char> 
>&) /elmer/elmer4/rcollins/gcc3/dist/include/g++-v3/bits/std_istream.h:278:            
std::basic_iostream<_CharT,    
_Traits>::basic_iostream(std::basic_streambuf<_CharT, _Traits>*) 
[with    _CharT = char, _Traits = 
std::char_traits<char>] make[1]: *** 
[/elmer/elmer16/rcollins/pwlib/lib/obj_unixware_x86_r/httpsvc.o] Error 
1

 
The message below 
tells me there is no matching function for call to the default constructor of 
basic_iostream.
 
The function being 
compiled is a constructor of PSystemLog, which is derived from iostream (a 
template defing the basic_iostream class).
 
The base class constructor gets called 
automatically.  Does the language try to find one that matches the derived 
class constructor signature?  Or does it just use the default 
constructor?  Anyway, this explains why there is a call (implied) to the 
default constructor of basic_iostream.
 
If a default constructor isn't defined, 
doesn't it get created automatically?  Does a default basic_iostream make 
any sense?  Has it been explicitly defined private to prevent its 
use?
 
Am I missing an obvious fix?
 
Roger
  --
Roger Collins
ProProject, Inc.
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