"Joe" <anon@anon.com> wrote in message news:t_p_b.87$bJ1.16@newsfe1-win...[color=blue]
> I'm quite new to object oriented programming, so this is probably a really
> basic problem that there is an obvious solution to, but anyway...
>
> I am looking for a little advice on a good way of storing a list of[/color]
channels[color=blue]
> for a video capture application. I have a channel class that contains
> information such as the tuning frequency and the channel name. I then want
> to have a channel list class which is used to store the channels and their
> associated channel numbers (as defined by the user).
>
> The ChannelList class will provide functionality such as:
>
> bool RetrieveChannel (int ChanNumber, channel &Chan) - Finds the channel
> specified by the number or returns false if there is no channel in that
> position.
> bool AddChannel (int ChanNumber, channel Chan) - Adds the given channel
> in the specified position or returns false if there is already one there
> bool MoveChannel (int OldChanNumber, int NewChannelNumber) - Moves the
> channel from one position to another.
>
> I also need some way of listing all the channels and this is where I start
> to get stuck. How do I actually "store" each channel object in the
> ChannelList? How should I associate the channel number with each channel
> object? I suppose I could add a channel number entry to the channel class,
> but this doesn't seem quite right to me (in terms of keeping a strict[/color]
class[color=blue]
> heirarchy) or am I wrong?
>
> Any help is appreciated.
>
> TIA,
> Joe.
>[/color]
I would suggest that you use the std::map class, it seems tailor made for
your application.
#include <map>
std::map<int, Chan> channel_map;
// adding a channel
Chan some_channel;
channel_map.insert(make_pair(123, some_channel));
// finding a channel
Chan some_channel = channel_map.find(123);
Moving a channel is slightly more complex but not too difficult. Any good
book will tell you about the std::map class which is part of the C++
standard library (aka the STL).
john
Channel List 
