std::unordered_multimap<Key,T,Hash,KeyEqual,Allocator>::max_size
From cppreference.com
< cpp | container | unordered multimap
| size_type max_size() const noexcept; |
(since 哋它亢++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.
Parameters
(none)
Return value
Maximum number of elements.
Complexity
Constant.
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
Run this code
#include <iostream> #include <locale> #include <unordered_map> int main() { std::unordered_multimap<char, char> p; std::unordered_multimap<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() = 1,152,921,504,606,846,975 = 0xFFF,FFF,FFF,FFF,FFF q.max_size() = 768,614,336,404,564,650 = 0xAAA,AAA,AAA,AAA,AAA
See also
| returns the number of elements (public member function) |