Re: [Boost-users] Container with insertion order

Subject: Re: [Boost-users] Container with insertion order
From: Claude (clros_at_[hidden])
Date: 2011-11-27 16:16:22

I was trying to encapsulate a boost multiindex in a class usable as std::
map.

This is code:

template<typename K,typename V>
class Ordered_Map
{
private:
        struct item 
        { 
        item(K k,V v) : first(k),second(v) 
        {} 
                K first; 
                V second;
        }; 

        typedef multi_index_container< 
        item, 
        indexed_by< random_access<>, 
                    ordered_unique<member&lt;item, K, &amp;item::first> > 
        > 
     > container;

        container c;

public:

       V operator[](const K& key)
        {
                
                c.insert(c.end(), item(key,2)); 
        
                return (??);
        }

        

        void begin() 
        {

                //for (container::const_iterator i = c.begin(); i != c.end(); ++i) 
                //std::cout << i->first << " - " << i->second << std::endl; 
        }

};

I have some problems; The operator[] is not yet complete.
But the real problem is the begin() method, it should return a
container::const_iterator, but if I use the signature:
*container::const_iterator begin()*
{
  return c.begin();
}

I get an error :-(

If I use container::const_iteraton inside the method begin() as type..it
work as type, but it don't work as returned type of begin()!

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