question on no-argument constructor

From	Oliver <fwang2@gmail.com>
Newsgroups	comp.lang.c++
Subject	question on no-argument constructor
Date	2012-02-21 05:26 -0800
Organization	http://groups.google.com
Message-ID	<18415058.42.1329830819543.JavaMail.geo-discussion-forums@vbne13> (permalink)

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hi, all -

I have a newbie question: suppose I have a user-defined class that must take a argument to properly initialize. so I have something like:

class Foo {
   explicit Foo(const string &str);
...
}

Another class define Foo as its member:

class Bar {

private:
   Foo foo;
}

Now the compiler complains that it can find the candidate constructor. So it seems I must define a no-argument constructor for Foo ... at the risk of the object can exist without being properly initialized? I must have missed something ... 

Thanks for your help

Oliver

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question on no-argument constructor Oliver <fwang2@gmail.com> - 2012-02-21 05:26 -0800
  Re: question on no-argument constructor "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2012-02-21 14:32 +0100
    Re: question on no-argument constructor Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-02-21 05:44 -0800
  Re: question on no-argument constructor "Fred Zwarts \(KVI\)" <F.Zwarts@KVI.nl> - 2012-02-21 14:44 +0100
    Re: question on no-argument constructor Oliver <fwang2@gmail.com> - 2012-02-21 06:41 -0800
      Re: question on no-argument constructor Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-02-21 08:14 -0800
        Re: question on no-argument constructor Juha Nieminen <nospam@thanks.invalid> - 2012-02-21 17:00 +0000
      Re: question on no-argument constructor Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-02-21 21:12 +0000
      Re: question on no-argument constructor Goran <goran.pusic@gmail.com> - 2012-02-21 23:44 -0800

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