Question

I have been trying to initialize 1 vector and 1 map in a class.
So to put it simply, once the class or rather a new object has been created, a vector and a map will then be generated or initialized to be able to store items.

How can i actually go about doing it? I am rather clueless and have not found any source on how will i be able to do this. Help is appreciated.

In Nodes.H

class nodes
{
friend ostream &operator<<(ostream &, const nodes&);
vector<string> dataItemsVec;
map<int,int> fingertable;

private:
int nodeNum;    // node number
string dataItems; // data items
public:
nodes();    
nodes(int, string) : dataItemsVec(){} && fingertable(){}; // i am not sure how to do it
~nodes();
}

In Nodes.cpp

#include "nodes.h"

ostream &operator<<(ostream &printout, const nodes &node)
{
printout<< node.nodeNum << endl;
return printout;
}

nodes::nodes()
{
nodeNum = 0;
dataItems = "";
}

nodes::nodes(int nodeNum,string dataItems)
{
this->nodeNum=nodeNum;
this->dataItems=dataItems;
}

Upon initializing this new object called ‘nodes’.
A vector will be initialized with 0 values to store dataItems.
A map will be initialized with 0 values to store other variables.

Answer 1

You don’t need to do anything. The default constructor for vector and map cause them to be correctly initialised.