size_type max_size() const;
(since C++11)

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.


[edit] Parameters


[edit] Return value

Maximum number of elements.

[edit] Exceptions

noexcept specification:  

[edit] Complexity


[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 <unordered_multimap>
int main()
    std::unordered_multimap<char,char> s;
    std::cout << "Maximum size of a 'unordered_multimap' is " << s.max_size() << "\n";

Possible output:

Maximum size of a 'unordered_multimap' is 18446744073709551615

See also

returns the number of elements
(public member function)