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Home » Tip Bank » C++
Language: C++
Expertise: Intermediate
Dec 17, 1998

Checking a Vector's Capacity

The member function capacity() returns the total number of elements that a vector can hold without requiring reallocation:
 
#include <iostream>
#include <vector>
using namespace std;

void main() 
{    
 vector <int> vi;
 vi.reserve(10);  //make room for at least 10 more int's
 cout<< vi.size(); //output 0; no elements are stored in vi 
cout<< vi.capacity(); //output 10; vi has enough room for 10 elements
}
You can use capacity() before inserting new elements to check whether existing iterators may become invalidated as a result.
Danny Kalev
 
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