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Make the vector as large as possible without reallocating

#include <algorithm> #include <iostream> #include <vector> using namespace std; template <class T> void print(T& c){    for( typename T::iterator i = c.begin(); i != c.end(); i++ ){       std::cout << *i << endl;    } } int main( ) {    vector<double> v( 5, 2.78 );    v[2] = 0.0;    // make the vector as large as possible without reallocating    v.resize( v.capacity(), 2.78 ); }