make a big vector and then deallocate all its memory : vector capacity « vector « C++ Tutorial






#include <algorithm>
#include <iostream>
#include <vector>

using namespace std;

int main( )
{
   // make a big vector and then deallocate all its memory
   const int big_size = 10000;
   vector<double> v( big_size );
   cout << "Before clearing, the capacity of the vector is "
      << v.capacity() << " and its size is " << v.size();
   v.clear();
   cout << "\nAfter clearing, the capacity of the vector is "
      << v.capacity() << " and its size is " << v.size();
   vector<double>().swap( v );

   cout << "\nAfter swapping, the capacity of the vector is "
      << v.capacity() << " and its size is " << v.size();

}








16.7.vector capacity
16.7.1.make a big vector and then deallocate all its memory
16.7.2.make a big vector and then minimize its memory
16.7.3.make the vector as large as possible without reallocating
16.7.4.Demonstrating the STL vector capacity
16.7.5.Demonstrating the STL vector capacity and reserve functions