Re: vector<> can probably never grow to it's maximum size!

[Dhruv Matani <dhruvbird at gmx dot net>]

On Wed, 2004-10-20 at 20:50, Paolo Carlini wrote:
> Dhruv Matani wrote:
> 
> >Yes, I have attached a file containing the test results.
> >  
> >
> For which test and which parameters? The last numbers are too small
> to be meaningful.

This one ;-)


> 
> Paolo.
-- 
        -Dhruv Matani.
http://www.geocities.com/dhruvbird/

The price of freedom is responsibility, but it's a bargain, because
freedom is priceless. ~ Hugh Downs

#include <stddef.h>
#include <cstddef>
#include <iostream>
#include <vector>
#include <string>
#include <ext/bitmap_allocator.h>

// #define ALLOC_ std::allocator
// #define ALLOC_ __gnu_cxx::__mt_alloc
#define ALLOC_ __gnu_cxx::bitmap_allocator

using namespace std;

int ctor = 0;
int dtor = 0;

#define INNER_CLASS float
//std::vector<int>
// string
#define INITIALIZER1 1024
// "Small string"
// 

struct one
{
  INNER_CLASS i;
  one() : i(INITIALIZER1) { }
  one(const one& _other) : i(_other.i)
  { ++ctor; }
  ~one() { ++dtor; }
};

int main()
{
  int ctr = 0;
  int x = 300000;
  cout<<sizeof(one)<<", "<<(64/sizeof(one)+1)<<endl;

  while (x--)
    {
      const int initial_sz = 64 / sizeof(one) + 1;
      std::vector<one, ALLOC_<one> > ov(initial_sz);
      for (int i = 0; i < initial_sz - 2; ++i)
	{
	  ov.push_back(one());
	}
      ++ctr;
    }
  cout<<"Copy ctor called: "<<ctor<<" times.\n"
      <<"Destructor called: "<<dtor<<" times."<<endl;
}