G4AllocatorPool.cc

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//
// G4AllocatorPool class implementation
//
// Author: G.Cosmo, November 2000
// --------------------------------------------------------------------
 
#include "G4AllocatorPool.hh"
 
// ************************************************************
// G4AllocatorPool constructor
// ************************************************************
//
G4AllocatorPool::G4AllocatorPool(unsigned int sz)
  : esize(sz < sizeof(G4PoolLink) ? sizeof(G4PoolLink) : sz)
  , csize(sz < 1024 / 2 - 16 ? 1024 - 16 : sz * 10 - 16)
{}
 
// ************************************************************
// G4AllocatorPool copy constructor
// ************************************************************
//
G4AllocatorPool::G4AllocatorPool(const G4AllocatorPool& right)
  : esize(right.esize)
  , csize(right.csize)
  , chunks(right.chunks)
  , head(right.head)
  , nchunks(right.nchunks)
{}
 
// ************************************************************
// G4AllocatorPool operator=
// ************************************************************
//
G4AllocatorPool& G4AllocatorPool::operator=(const G4AllocatorPool& right)
{
  if(&right == this)
  {
    return *this;
  }
  chunks  = right.chunks;
  head    = right.head;
  nchunks = right.nchunks;
  return *this;
}
 
// ************************************************************
// G4AllocatorPool destructor
// ************************************************************
//
G4AllocatorPool::~G4AllocatorPool() { Reset(); }
 
// ************************************************************
// Reset
// ************************************************************
//
void G4AllocatorPool::Reset()
{
  // Free all chunks
  //
  G4PoolChunk* n = chunks;
  G4PoolChunk* p = nullptr;
  while(n)
  {
    p = n;
    n = n->next;
    delete p;
  }
  head    = nullptr;
  chunks  = nullptr;
  nchunks = 0;
}
 
// ************************************************************
// Grow
// ************************************************************
//
void G4AllocatorPool::Grow()
{
  // Allocate new chunk, organize it as a linked list of
  // elements of size 'esize'
  //
  G4PoolChunk* n = new G4PoolChunk(csize);
  n->next        = chunks;
  chunks         = n;
  ++nchunks;
 
  const int nelem = csize / esize;
  char* start     = n->mem;
  char* last      = &start[(nelem - 1) * esize];
  for(char* p = start; p < last; p += esize)
  {
    reinterpret_cast<G4PoolLink*>(p)->next =
      reinterpret_cast<G4PoolLink*>(p + esize);
  }
  reinterpret_cast<G4PoolLink*>(last)->next = nullptr;
  head = reinterpret_cast<G4PoolLink*>(start);
}