[boost] pool library handling

From: Thomas Porschberg (thomas.porschberg_at_[hidden])
Date: 2003-07-02 07:12:15

Hello,
I have question regarding the pool library.
In my application I read a lot of data records from a database
into a small data class and therefor I thought object_pool could help me
to reduce memory consumption.

So I wrote:

class OuterClass
{
  ...
  class row{
  ...
  private:
       ...
       static boost::object_pool<OuterClass::row> p;
  };
};

In OuterClass.cc I do

boost::object_pool<OuterClass::row> OuterClass::row::p;

inline void * OuterClass::row::operator new(size_t size){
  return p.malloc();
}

inline void OuterClass::row::operator delete(void *p, size_t size){
}

The code works.
However every time I instantiate a OuterClass::row p.malloc is called.

Is there a way to reduce the calls to p.malloc ?
Normally I know the rough number of rows I fetch from the database,
say 100.000 .
So it would be a great thing to allocate memory for
10.000 * sizeof(OuterClass::row) and later only to glide on this
memory chunk.

Can anyone give me a hint if and how to achieve that ?

Thomas

-- 
Please avoid sending me Word or PowerPoint attachments.
See http://www.fsf.org/philosophy/no-word-attachments.html