Difference between revisions of "cpp/container/map/max size"
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Latest revision as of 18:49, 29 November 2021
| size_type max_size() const; |
(noexcept 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.
Contents |
[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 <locale> #include <map> int main() { std::map<char, char> p; std::map<long, char> q; std::cout.imbue(std::locale("en_US.UTF-8")); std::cout << std::uppercase << "p.max_size() = " << std::dec << p.max_size() << " = 0x" << std::hex << p.max_size() << '\n' << "q.max_size() = " << std::dec << q.max_size() << " = 0x" << std::hex << q.max_size() << '\n'; }
Possible output:
p.max_size() = 461,168,601,842,738,790 = 0x666,666,666,666,666 q.max_size() = 384,307,168,202,282,325 = 0x555,555,555,555,555
See also
| returns the number of elements (public member function) |
