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Tip of the Day
Home » Tip Bank » C++
Language: C++
Expertise: Intermediate
Apr 21, 1999

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Specifying the Size of a Vector During Construction

It is possible to specify the requested storage size of a vector during construction like this:
 
#include <vector>
using namespace std;
int main() 
{
  vector<int>  vi(1000); //initial storage for 1000 int's
  //vi contains 1000 elements initialized by int::int()
}
Remember that vector::reserve() allocates raw memory without initializing it. The constructor, on the other hand, initializes the allocated elements by invoking their default constructor. It is possible to specify a different initializer value:
 
vector<int>  vi(1000, 4); //initialize  all 1000 int's with 4
Danny Kalev
 
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