public member function

std::list::size

<list>
size_type size() const;
Return size
Returns the number of elements in the container.

Parameters

none

Return Value

The number of elements that conform the list's content.

Member type size_type is an unsigned integral type.

Example

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// list::size
#include <iostream>
#include <list>
using namespace std;

int main ()
{
  list<int> myints;
  cout << "0. size: " << (int) myints.size() << endl;

  for (int i=0; i<10; i++) myints.push_back(i);
  cout << "1. size: " << (int) myints.size() << endl;

  myints.insert (myints.begin(),10,100);
  cout << "2. size: " << (int) myints.size() << endl;

  myints.pop_back();
  cout << "3. size: " << (int) myints.size() << endl;

  return 0;
}


Output:
0. size: 0
1. size: 10
2. size: 20
3. size: 19

Complexity

Constant (recommended). Linear in some implementations.

See also

list::resize
Change size (public member function)
list::max_size
Return maximum size (public member function)

C++