deque max_size() function in C++ STL

The deque::max_size() is a built-in function in C++ STL which returns the maximum number of elements that a deque container can hold.

Syntax:

deque_name.max_size()

Parameters: The function does not accept any parameters.

Return Value: The function returns the maximum number of elements that a deque container can hold.

Below programs illustrate the above function:

Program 1:

// CPP program to demonstrate the 
// deque::max_size() function 
// when deque is non-empty 
#include <bits/stdc++.h> 
using namespace std; 
int main() 
{ 
    deque<int> dq; 
  
    dq.push_back(1); 
    dq.push_back(10); 
    dq.push_back(100); 
    dq.push_back(50); 
    dq.push_back(40); 
    dq.push_back(23); 
    dq.push_back(6); 
  
    cout << "The deque elements: "; 
    for (auto it = dq.begin(); it != dq.end(); it++) 
        cout << *it << " "; 
  
    cout << "\nThe max-size of deque: " << dq.max_size(); 
  
    return 0; 
} 

Output:

The deque elements: 1 10 100 50 40 23 6 
The max-size of deque: 4611686018427387903

Program 2:

// CPP program to demonstrate the 
// deque::max_size() function 
// when deque is empty 
#include <bits/stdc++.h> 
using namespace std; 
int main() 
{ 
    deque<int> dq; 
  
    cout << "The max-size of deque: " << dq.max_size(); 
  
    return 0; 
} 

Output:

The max-size of deque: 4611686018427387903

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