C++ Vector Library - max_size() Function

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Description

The C++ function std::vector::max_size() returns the maximum number of elements can be held by vector.

This value depends on system or library implementation.

Declaration

Following is the declaration for std::vector::max_size() function form std::vector header.

C++98

size_type max_size() const;

C++11

size_type max_size() const noexcept;

Parameters

None

Return value

Returns the maximum numbers that can be fit into vector container.

Exceptions

This member function never throws exception.

Time complexity

Constant i.e. O(1)

Example

The following example shows the usage of std::vector::max_size() function.

#include <iostream>
#include <vector>

using namespace std;

int main(void) {
   vector<int> v;

   cout << "max_size = " << v.max_size() << endl;

   return 0;
}

Let us compile and run the above program, this will produce the following result −

max_size = 4611686018427387903