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forward_list::max_size() in C++ STL

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std::forward_list::max_size() is an inbuilt function in CPP STL which returns the maximum number of elements can be held by forward_list. This value depends on system or library implementation.


forwardlist_name.max_size ()

Parameters: The function does not accept any parameters.

Return value:The function returns the maximum numbers that can be stored into the forward_list.

Below program demonstrates the above function: 


// C++ program to illustrate the
// max_size() function
#include <bits/stdc++.h>
using namespace std;
int main()
    // initialising the forward list
    forward_list<int> f;
    // print max number of values that
    // can be held by forward_list
    cout << "Max_size of the list is "
    << f.max_size() << endl;
    return 0;


Max_size of the list is 1152921504606846975

 Time Complexity: O(1)

Auxiliary Space: O(1)

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Last Updated : 30 Jun, 2023
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