Re: Pointers to key and value of a map

=?iso-8859-1?q?Erik_Wikstr=F6m?= <>
10 May 2007 01:54:58 -0700
On 10 Maj, 10:45, wrote:

Hi everybody,

I have defined a standard map as follows

map<int,double> nonzeroEntries;

because I wanted to take advantage of the container class. Now I have
a function with the following interface

myfunction( int * theIntegersInTheMap, double * theDoublesInTheMap);

therefore I need pointers to the key list and to the value list. Is
there any smart way to do this? At the moment I create two pointers

int * theIntegers = new int[sizeOfTheList];

double * theIntegers = new double[sizeOfTheList];

and fill them in, but this solution seems a bit redundant.

In case you didn't get it... I'm a total newbie in maps.

Sorry, but there's no easy way to do this, neither the keys not the
values are stored consecutive int the map (since it's node-based).

However if it is you who have written myfunction() and you want the
lists so that you can iterate over easily then you should use
std::map<int, double>::iterator instead.

Erik Wikstr=F6m

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