LambdaVector.cpp

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//
// Date:      13 September 2005
//
// Copyright (c) Sergey Satskiy 2005
//               <sergesatsky@yahoo.com>
//
// Permission to copy, use, modify, sell and distribute this software 
// is granted provided this copyright notice appears in all copies. 
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//

#include <iostream>
#include <vector>
using namespace std;

#include "boost/lambda/lambda.hpp"
#include "boost/function.hpp"
using namespace boost;
using namespace boost::lambda;


void f( const double &  Value )
{
    cout << "f called. Value: " << Value << endl;
}

void g( const double &  Value )
{
    cout << "g called. Value: " << Value << endl;
}




struct CallbackStorage
{
    CallbackStorage() {}

    vector< function< void ( const double & ) > >       v;


    void insert( function< void ( const double & ) >  func )
    {
        v.push_back( func );
    }

    
    void operator() ( const double &  val )
    {
        vector< function< void ( const double & ) > >::iterator k;
        for ( k = v.begin(); k != v.end(); ++k )
        {
            (*k)( val );
        }
    }

    
    void insert( double &  Ref )
    {
            // Generates a function in place!
        function< void ( const double & ) >  g = ( var( Ref ) = _1 );
        v.push_back( g );
    }

};





int  main( void )
{
    CallbackStorage     Storage;
    double              Value1( 1.1 );
    double              Value2( 2.2 );
    double              Value3( 3.3 );


        // Register some callbacks
    Storage.insert( f );            // Regular function
    Storage.insert( Value1 );       // Register variable - assignment function is generated
    Storage.insert( Value2 );       // Register variable - assignment function is generated
    Storage.insert( Value3 );       // Register variable - assignment function is generated
    Storage.insert( g );            // Regular function

    cout << "Before a call" << endl
         << "    Value1 = "     << Value1 << endl
         << "    Value2 = "     << Value2 << endl
         << "    Value3 = "     << Value3 << endl;

    Storage( 777.88 );

    cout << "After a call"  << endl
         << "    Value1 = "     << Value1 << endl
         << "    Value2 = "     << Value2 << endl
         << "    Value3 = "     << Value3 << endl;
    
    return 0;
}

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