C++ Deque 中的 size()函数

deque<int> d={1,2,3,4,5};
d.size()=5;

return_type size();

#include <iostream>
#include<deque>
using namespace std;
int main()
{
  deque<int> d;
  cout<<"size of deque is :"<<d.size();
  cout<<'\n';
  d.push_back(1);
  d.push_back(2);
  d.push_back(3);
  cout<<"size of deque is :"<<d.size();
   return 0;
}