std::set<Key,Compare,Allocator>:: max_size

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.

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

#include <iostream>
#include <locale>
#include <set>
int main()
{
    std::set<char> p;
    std::set<long> 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';
}

p.max_size() = 461,168,601,842,738,790 = 0x666,666,666,666,666
q.max_size() = 461,168,601,842,738,790 = 0x666,666,666,666,666

See also