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std::vector::max_size

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< cpp‎ | container‎ | vector
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size_type max_size() const;

Returns the maximum number of elements the container is able to hold due to system or library implementation limitations, i.e. std::distance(begin(), end()) for the largest container.

Contents

[edit] Parameters

(none)

[edit] Return value

Maximum number of elements.

[edit] Exceptions

(none) (until C++11)
noexcept specification:  
noexcept
  
(since C++11)

[edit] Complexity

Constant.

[edit] Notes

This value is typically equal to std::numeric_limits<size_type>::max(), and reflects the theoretical limit on the size of the container. At runtime, the size of the container may be limited to a value smaller than max_size() by the amount of RAM available.

[edit] Example

#include <iostream>
#include <vector>
 
int main()
{
    std::vector<char> s;
    std::cout << "Maximum size of a 'vector' is " << s.max_size() << "\n";
}

Possible output:

Maximum size of a 'vector' is 18446744073709551615

See also

returns the number of elements
(public member function) [edit]
returns the number of elements that can be held in currently allocated storage
(public member function) [edit]