Re: Is it possible to create a vector of vector?

From:

Kai-Uwe Bux <jkherciueh@gmx.net>

Newsgroups:

comp.lang.c++

Date:

Tue, 03 Jun 2008 18:02:03 -0400

Message-ID:

<4845bf5c$0$25952$6e1ede2f@read.cnntp.org>

Ramon F Herrera wrote:

What I am saving is a set of radio button (or check mark) widgets.
Some of them belong to a logical group, which is used to provide the
mutual exclusivity. When the user clicks on one, the other N-1 are
automatically turned off.

See below how I ended up implementing the insertion. If two buttons
have the same name, they belong in the same logical group. Observant
readers will notice this is of PDF.

-RFH

------------

void insertGroupedRadioButton(RadioButtonNode *radio)
{
int i;
RadioButtonGroup *empty_vector = new RadioButtonGroup();

  for (i = 0; i < (int)ListOfRadioButton.size() && radio->name !=
ListOfRadioButton[i][0].name; i++);

  if (i == ListOfRadioButton.size()) {
    ListOfRadioButton.push_back(*empty_vector);
    }

  ListOfRadioButton[i].push_back(*radio);
}

It looks to me that

  std::multimap< std::string, RadioButtonNode* >

is something that might be of interest to you. E.g.:

#include <string>
#include <map>
#include <cassert>
#include <iostream>
#include <ostream>

class RadioButtonNode {

  std::string the_name;

public:

  RadioButtonNode ( std::string const & name )
    : the_name ( name )
  {}

  std::string const & name ( void ) const {
    return ( the_name );
  }

  void on ( void ) {
    std::cout << "on: " << name() << " [" << this << "]\n";
  }

  void off ( void ) {
    std::cout << "off: " << name() << " [" << this << "]\n";
  }

};

class ButtonCollection {

  typedef std::multimap< std::string, RadioButtonNode* > map_type;

  map_type the_data;

public:

  void insert ( RadioButtonNode * radio ) {
    the_data.insert( make_pair( radio->name(), radio ) );
  }

  void on ( RadioButtonNode * radio ) {
    assert( radio != 0 );
    for ( map_type::iterator iter = the_data.lower_bound( radio->name() );
          iter != the_data.upper_bound( radio->name() ); ++iter ) {
      if ( iter->second == radio ) {
        iter->second->on();
      } else {
        iter->second->off();
      }
    }
  }

};

int main ( void ) {
  RadioButtonNode * n1 = new RadioButtonNode ( "n" );
  RadioButtonNode * n2 = new RadioButtonNode ( "n" );
  RadioButtonNode * n3 = new RadioButtonNode ( "n" );
  RadioButtonNode * n4 = new RadioButtonNode ( "n" );
  RadioButtonNode * q1 = new RadioButtonNode ( "q" );
  RadioButtonNode * q2 = new RadioButtonNode ( "q" );
  RadioButtonNode * q3 = new RadioButtonNode ( "q" );
  RadioButtonNode * q4 = new RadioButtonNode ( "q" );

  ButtonCollection the_collection;
  the_collection.insert( n1 );
  the_collection.insert( n2 );
  the_collection.insert( n3 );
  the_collection.insert( n4 );
  the_collection.insert( q1 );
  the_collection.insert( q2 );
  the_collection.insert( q3 );
  the_collection.insert( q4 );

  the_collection.on( n2 );
}



Best

Kai-Uwe Bux