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Reserves a minimum length of storage for a vector object, allocating space if necessary.
void reserve(
size_type _Count
);
Parameters
- _Count
The minimum length of storage to be allocated for the vector.
Example
// vector_reserve.cpp
// compile with: /EHsc
#include <vector>
#include <iostream>
int main( )
{
using namespace std;
vector <int> v1;
//vector <int>::iterator Iter;
v1.push_back( 1 );
cout << "Current capacity of v1 = "
<< v1.capacity( ) << endl;
v1.reserve( 20 );
cout << "Current capacity of v1 = "
<< v1.capacity( ) << endl;
}
Current capacity of v1 = 1 Current capacity of v1 = 20
Requirements
Header: <vector>
Namespace: std