The vector::max_size() is a built-in function in C++ STL which returns the maximum number of elements that can be held by the vector container.
Syntax:
vector_name.max_size()
Parameters: The function does not accept any parameters.
Return value: The function returns the maximum numbers that can fit into the vector container.
Time Complexity – Constant O(1)
Program below illustrates the above function:
CPP
// C++ program to illustrate the // vector::max_size() function #include <bits/stdc++.h> using namespace std;
int main()
{ // initialize a vector
vector< int > vec;
// returns the max_size of vector
cout << "max_size of vector 1 = " << vec.max_size() << endl;
vector< int > vec1;
// returns the max_size of vector
cout << "max_size of vector 2 = " << vec1.max_size() << endl;
return 0;
} |
Output:
max_size of vector 1 = 4611686018427387903 max_size of vector 2 = 4611686018427387903