std::vector<T,Allocator>::max_size (3) - Linux Man Pages

std::vector<T,Allocator>::max_size: std::vector<T,Allocator>::max_size

NAME

std::vector<T,Allocator>::max_size - std::vector<T,Allocator>::max_size

Synopsis


size_type max_size() const; (until C++11)
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.

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 <vector>


  int main()
  {
      std::vector<char> s;
      std::cout << "Maximum size of a 'vector' is " << s.max_size() << "\n";
  }

Possible output:


  Maximum size of a 'vector' is 9223372036854775807

See also


         returns the number of elements
size (public member function)
         returns the number of elements that can be held in currently allocated storage
capacity (public member function)