////   This file contains the C++ code from Program 13.5 of//   "Data Structures and Algorithms//    with Object-Oriented Design Patterns in C++"//   by Bruno R. Preiss.////   Copyright (c) 1998 by Bruno R. Preiss, P.Eng.  All rights reserved.////   http://www.pads.uwaterloo.ca/Bruno.Preiss/books/opus4/programs/pgm13_05.cpp//void* SinglyLinkedPool::Acquire (size_t bytes){    unsigned int const blocks =	(bytes + sizeof (Header) + sizeof (Block) - 1U) /	    sizeof (Block);    Block* prevPtr = &sentinel;    Block* ptr = prevPtr->next;    while (ptr != 0 && ptr->length < blocks)    {	prevPtr = ptr;	ptr = ptr->next;    }    if (ptr == 0)	throw bad_alloc ("out of memory");    if (ptr->length > blocks)    {	Block& newBlock = ptr [blocks];	newBlock.length = ptr->length - blocks;	newBlock.next = ptr->next;	ptr->length = blocks;	ptr->next = &newBlock;    }    prevPtr->next = ptr->next;    return ptr->userPart;}