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Difference between revisions of "cpp/container/unordered multiset/max size"

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Revision as of 18:05, 2 November 2012

[edit template]
 
C++
 
Containers library
 
std::unordered_multiset
Member types
Member functions
Non-member functions
(until C++20)
Deduction guides (C++17)
 
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

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_set>
 
int main()
{
    std::unordered_multiset<char> p;
    std::unordered_multiset<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';
}

Possible output: 

p.max_size() = 1,152,921,504,606,846,975 = 0xFFF,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]
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