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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/ranges/../../container/vector/max_size.html below:

std::vector<T,Allocator>::max_size - cppreference.com

size_type max_size() const;

(noexcept since C++11)
(constexpr since C++20)

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] 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

Possible output:

p.max_size() = 9,223,372,036,854,775,807 = 0x7,FFF,FFF,FFF,FFF,FFF
q.max_size() = 1,152,921,504,606,846,975 = 0xFFF,FFF,FFF,FFF,FFF
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]

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