How to create a map to insert elements based on an event

[jo123]

Hello All,
I need a help to create a map of vehicle ID, pedestrian ID and its corresponding distance from vehicle and then to find the minimum distance for a particular vehicle. Something like the following:
VehID PedID Distance
0 0 X0
0 1 X1
0 2 X2
1 0 Y0
1 1 Y1
1 2 Y2 and so on..

I get each of these entries in different time based on events, like:
Event #1 at time t1 (Pedestrian_ID:0 have distance of X0 from Vehicle_ID:0)
Event #2 at time t2 (Pedestrian_ID:1 have distance of X1 from Vehicle_ID:0)
and so on....

I want to create a map so that it can store each line of entry and keep appending for next entries according to next events. Finally at the last event I should get the full map with all the entries
Then I need to find:
The pedestrian which has the minimum distance from Vehicle_ID:0
The pedestrian which has the minimum distance from Vehicle_ID:1 and so on..

I have started with this code as below:

std::map <int vehicle_ID std::map<<int pedestrian_ID, double distance>> my_Map;

But I am not able to find, how to add subsequent entries based on events generated at different time and to store them.

Thanks

[gunnerfunner]

Rather than go down the container within a container route you can keep things more simple by designing classes/structs to capture the information that you need. For eg, based on what you've written but without seeing the actual assignment, such a struct might look like this:

struct Pedestrian{};
struct Vehicle{};//forward declarations
struct Event
{
	double m_time;
	Pedestrian m_ped;
	Vehicle m_vehc;
};
struct Pedestrian
{
	string m_name;
	double m_x_p;
	double m_y_p;//since you are measuring distance I suppose you need some form of co-ordinates;

	Pedestrian(string name, double x_p, double y_p) : m_name(name), m_x_p(x_p), m_y_p(y_p) {}
	//I have taken the relatively straight-forward approach of getting all Pedestrian details through the ctor, you can also have getters if you wish
};
struct Vehicle
{
	string m_vehc-id;
	double m_x_v;
	double m_y_v;

	Vehicle(string vehc-id, double x_v, double y_v) : m_vehc-id(vehc-id), m_x_v(x_v), m_y_v(y_v) {}
};

So now each event object would have all the information requried and you can create vector<Event> to capture all events. Then for any vehicle you can iterate over the vector to see which pedestrian was closest and so on.

[jo123]

Thank you, I am trying that.