Peter Niessen     <niessen@physik.rwth-aachen.de> wrote:
: I'd like to have a vector of vectors:
: #include <String.h>
: #include <vector.h>
: class TConf
: {
:  private:
:   struct Config
:   {
:    int Port;
:    struct Command
:    {
:     String ComString;
:     // other stuff
:    }
assumed ;
:    vector<Command> CommandList;
:   }
assumed ;
:   vector<Config> ConfigList;
:  public:

: when compiling, I get (g++ on Linux)
: /tmp/cca188161.o: In function `TConf::Config::operator=(TConf::Config
: const &)':
: /tmp/cca188161.o(.text+0x1bb8): undefined reference to
: `vector<TConf::Config::Command>::operator=(vector<TConf::Config::Command>
: const &)'

I think you have a compiler bug.  Somewhere in your code, there is a
statement
 ConfigList[i] = ConfigList[j];
or something else that requires Config.operator=().  Since Config does
not have an operator= defined, the compiler must generate one as:
   Config& operator= (Config const& rhs) {
    Port = rhs.Port;
    CommandList = rhs.CommandList;
    return *this;
    }
It should notice the second line which is the vector<>.operator= and
instantiate it.  It doesn't seem to notice, leading to the link error.
If I add the above code to the struct Config definition, g++ gets the
rest correct.

John
---
[ comp.std.c++ is moderated.  To submit articles: Try just posting with your
                newsreader.  If that fails, use mailto:std-c++@ncar.ucar.edu
  comp.std.c++ FAQ: http://reality.sgi.com/austern/std-c++/faq.html
  Moderation policy: http://reality.sgi.com/austern/std-c++/policy.html
  Comments? mailto:std-c++-request@ncar.ucar.edu
]

I'd like to have a vector of vectors:

#include <String.h>
#include <vector.h>

class TConf
{
 private:

  struct Config
  {
   int Port;

   struct Command
   {
    String ComString;
    // other stuff
   }

   vector<Command> CommandList;
  }

  vector<Config> ConfigList;

 public:

  int ReadCfg (String *CfgFile);

  ...
}

when compiling, I get (g++ on Linux)

/tmp/cca188161.o: In function `TConf::Config::operator=(TConf::Config
const &)':
/tmp/cca188161.o(.text+0x1bb8): undefined reference to
`vector<TConf::Config::Command>::operator=(vector<TConf::Config::Command>
const &)'

What is the remedy for that?

Cheers, Peter.
---
[ comp.std.c++ is moderated.  To submit articles: try just posting with      ]
[ your news-reader.  If that fails, use mailto:std-c++@ncar.ucar.edu         ]
[ FAQ:      http://reality.sgi.com/employees/austern_mti/std-c++/faq.html    ]
[ Policy:   http://reality.sgi.com/employees/austern_mti/std-c++/policy.html ]
[ Comments? mailto:std-c++-request@ncar.ucar.edu                             ]