bool FixedAllocator::MakeNewChunk( void )
{
bool allocated = false;
try
{
std::size_t size = chunks_.size();
// Calling chunks_.reserve *before* creating and initializing the new
// Chunk means that nothing is leaked by this function in case an
// exception is thrown from reserve.
if ( chunks_.capacity() == size )
{
if ( 0 == size ) size = 4;
chunks_.reserve( size * 2 );
}
Chunk newChunk;
allocated = newChunk.Init( blockSize_, numBlocks_ );
if ( allocated )
chunks_.push_back( newChunk );
}
catch ( ... )
{
allocated = false;
}
if ( !allocated ) return false;
allocChunk_ = &chunks_.back();
deallocChunk_ = &chunks_.front();
return true;
}
bool FixedAllocator::TrimChunkList( void )
{
if ( chunks_.empty() )
{
assert( NULL == allocChunk_ );
assert( NULL == deallocChunk_ );
}
if ( chunks_.size() == chunks_.capacity() )
return false;
// Use the "make-a-temp-and-swap" trick to remove excess capacity.
Chunks( chunks_ ).swap( chunks_ );
return true;
}