std::unordered_map max_size() method
- od C++11
// Const version only
size_type max_size() const noexcept;
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.
Parameters
(none)
Return value
Maximum number of elements.
Complexity
Constant.
Exceptions
(none)
Notes
This value typically reflects the theoretical limit on the size of the container, at most std::numeric_limits<difference_type>::max()
.
At runtime, the size of the container may be limited to a value smaller than max_size()
by the amount of RAM available.
Example
#include <iostream>
#include <locale>
#include <unordered_map>
int main()
{
std::unordered_map<char, char> q;
std::cout.imbue(std::locale("en_US.UTF-8"));
std::cout << "Maximum size of a std::unordered_map is " << q.max_size() << '\n';
}
Maximum size of a std::unordered_map is 768,614,336,404,564,650
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