std::flat_map<Key,T,Compare,KeyContainer,MappedContainer>::max_size
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Tables
std::flat_map
flat_map::max_size
size_type max_size() const noexcept;
(since C++23)
Returns the maximum number of elements the container is able to hold due to system or library implementation limitations. Equivalent to std::min <size_type>(c.keys.max_size(), c.values.max_size()).
[edit] Parameters
(none)
[edit] Return value
Maximum number of elements.
[edit] Complexity
Constant.
[edit] 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.
[edit] Example
Run this code
#include <iostream> #include <flat_map> #include <locale> int main() { std::flat_map <char, char> q; std::cout.imbue(std::locale ("en_US.UTF-8")); std::cout << "Maximum size of a std::flat_map is " << q.max_size() << '\n'; }
Possible output:
Maximum size of a std::flat_map is 768,614,336,404,564,650