list and arrays

[Nair69]

using the following header files:

#include <list>
#include <map>
#include <iostream>
#include <algorithm>

and

std::list

If there is a creation of a list, how can one find the sizeof the list. and is it possible to copy all the data from the linked list into an array. Assuming that the data is of type

char

[Paul McKenzie]

how can one find the sizeof the list.

Do you literally mean "sizeof()"?

#include <list>
#include <iostream>

using namespace std;

int main()
{
  cout << sizeof(std::list<char>) << endl;
}

That returns the size of the std::list<char> type in bytes.

Or do you mean you want to know the number of items in the list? If so, then look at the std::list<T>::size() function.

and is it possible to copy all the data from the linked list into an array. Assuming that the data is of type

char

Use std::copy() and make sure the array is sized appropriately so that it can hold all of the elements. To be safer, ditch the array and use a vector for safety.

#include <algorithm>
#include <vector>
#include <list>
#include <iterator>
#include <iostream>

using namespace std;

int main()
{
    std::list<char> list1;
    list1.push_back('a');
    list1.push_back('b');
    list1.push_back('c');
    vector<char> v;

    // copy items to the vector
    copy(list1.begin(), list1.end(), back_inserter(v));

   // output items in the vector
    copy(v.begin(), v.end(), ostream_iterator<char>(cout, " "));
}

http://www.cplusplus.com/reference/algorithm/copy/

Regards,

Paul McKenzie