C++ <forward_list> - assign() Function
The C++ forward_list::assign function is used to assign new values to the forward_list, replacing its old values, and modifying its size if necessary.
Syntax
//range version template <class InputIterator> void assign (InputIterator first, InputIterator last); //fill version void assign (size_type n, const value_type& val); //initializer list version void assign (initializer_list<value_type> ilist);
Parameters
first |
Specify the starting position of InputIterator. The range used by InputIterator is [first,last). |
last |
Specify the last position of InputIterator. The range used by InputIterator is [first,last). |
n |
Specify new size of the forward_list. |
val |
Specify the value to fill the forward_list with. Each of the forward_list will be initialized to a copy of this value. |
ilist |
Specify the initializer_list object. |
Return Value
None.
Time Complexity
Linear i.e, Θ(n)
Example:
In the example below, the forward_list::assign function is used to assign new values to the given forward_list, replacing its old values.
#include <iostream>
#include <forward_list>
using namespace std;
int main (){
forward_list<int> flist1;
forward_list<int> flist2;
forward_list<int> flist3;
forward_list<int>::iterator it;
//using fill version - size 5 with value 10
flist1.assign(5, 10);
//using range version
flist2.assign(flist1.begin(), flist1.end());
//using initializer list version
int MyList[] = {10, 20, 30, 40, 50};
flist3.assign(MyList, MyList+3);
cout<<"flist1 contains: ";
for(it = flist1.begin(); it != flist1.end(); it++)
cout<<*it<<" ";
cout<<"\nflist2 contains: ";
for(it = flist2.begin(); it != flist2.end(); it++)
cout<<*it<<" ";
cout<<"\nflist3 contains: ";
for(it = flist3.begin(); it != flist3.end(); it++)
cout<<*it<<" ";
return 0;
}
The output of the above code will be:
flist1 contains: 10 10 10 10 10 flist2 contains: 10 10 10 10 10 flist3 contains: 10 20 30
❮ C++ <forward_list> Library
