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// Demonstrating the STL vector capacity and reserve functions.

#include <vector.h>

#include <algo.h>

#include <assert.h>

class U {

public:

unsigned long id;

U() : id(0) { }

U(unsigned long x) : id(x) { }

};

int main()

{

cout << "Demonstrating STL vector capacity and reserve "

"functions." << endl;

int N = 10000; // size of vectors

vector<U> vector1, vector2;

cout << "Doing " << N << " insertions in vector1,\n"

<< "with no advance reservation.\n";

for (int k = 0; k != N; ++k) {

long cap = vector1.capacity();

vector1.push_back(U(k));

if (vector1.capacity() != cap)

cout << "k: " << k << ", new capacity: "

<< vector1.capacity() << endl;

}

vector2.reserve(N);

cout << "\nNow doing the same thing with vector2,\n"

<< "after starting with reserve(" << N << ").\n";

for (k = 0; k != N; ++k) {

long cap = vector2.capacity();

vector2.push_back(U(k));

if (vector2.capacity() != cap)

cout << "k: " << k << ", new capacity: "

<< vector2.capacity() << "\n";

}

}