Does vector size always gets doubled when increasing it's size?

#1

In case we push an element at (vector size + 1) index, does the vector size always gets doubled, or will it just increase by the number of elements pushed?

#2

hello @niveditha_palli

there are two terms .
a) vector size -> it is equal to number of elements in the vector.

b) vector capacity-> total space vector is taking.

when vector size exceeds its capacity then vector capacity get doubled.

ex->

int main(){
  vector<int > vec;
  vec.push_back(1); 
  vec.push_back(1); 
  vec.push_back(1); 
  cout<<"size of vector"<<vec.size()<<endl;
  cout<<"capacity of vector"<<vec.capacity()<<endl;
  return 0;
}
currently size is 3 and capacity is 4.

Now if we push back one more element,
now size is: 4 capacity is 4

now if we try to insert one more element in vector then size will become 5 but capacity will become 8.

is this what u want to know?

#3

Thank you, understood it much better.

#4

Yes, that was my question.

#5

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