std::flat_map<Key,T,Compare,KeyContainer,MappedContainer>::max_size - cppreference.com (original) (raw)

| 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

#include #include #include   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

[edit] See also

| | returns the number of elements (public member function) [edit] | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |