how a vector of objects (with static members) is constructed
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// ==== test.h =====
using namespace std;

void test();

class Record{
    static int total_number;
    int id;
public:
    Record();
    void show() {std::cout << id << " "; }
};


// ==== test.cpp ====
#include "stdafx.h"
#include <iostream>
#include <vector>
#include "test.h"
using namespace std;

Record::Record(){
    total_number += 1;
    id = total_number;
 }

void test(){

    const int vec_length = 5;
    Record a[vec_length];

    for (unsigned int i=0; i<vec_length; i++)
        a[i].show();

    cout << endl;

    vector<Record> vr(vec_length);
    for (unsigned int i=0; i<vr.size(); i++)
        vr[i].show();
    cout << endl;
}


// ==== main.cpp =====
#include "stdafx.h"
#include <iostream>
#include "test.h"
using namespace std;

int Record::total_number = 0;

int _tmain(int argc, _TCHAR* argv[])
{
    test();
    return 0;
}

std::vector<Record> v(5, Record());

std::vector<Record> v(5);

Record::Record() : id(++total_number) {}

Record::Record(const Record &other) : id(other.id) {}