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STASH4.CPP
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1995-02-23
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// File from page 181 in "Thinking in C++" by Bruce Eckel
//////////////////////////////////////////////////
// From the compressed package ECKELT01.ZIP 2/21/95
// Copyright (c) Bruce Eckel, 1995
// Source code file from the book "Thinking in C++",
// Prentice Hall, 1995, ISBN: 0-13-917709-4
// All rights reserved EXCEPT as allowed by the following
// statements: You may freely use this file for your own
// work, including modifications and distribution in
// executable form only. You may copy and distribute this
// file, as long as it is only distributed in the complete
// (compressed) package with the other files from this
// book and you do not remove this copyright and notice.
// You may not distribute modified versions of the source
// code in this package. This package may be freely placed
// on bulletin boards, internet nodes, shareware disks and
// product vendor disks. You may not use this file in
// printed media without the express permission of the
// author. Bruce Eckel makes no
// representation about the suitability of this software
// for any purpose. It is provided "as is" without express
// or implied warranty of any kind. The entire risk as to
// the quality and performance of the software is with
// you. Should the software prove defective, you assume
// the cost of all necessary servicing, repair, or
// correction.
// If you think you've found an error, please
// email all modified files with loudly commented changes
// to: eckel@aol.com (please use the same
// address for non-code errors found in the book).
//////////////////////////////////////////////////
//: STASH4.CPP -- Function overloading
#include "..\4\stash4.h"
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
stash::stash(int Size) {
size = Size;
quantity = 0;
next = 0;
storage = 0;
}
stash::stash(int Size, int InitQuant) {
size = Size;
quantity = 0;
next = 0;
storage = 0;
inflate(InitQuant);
}
stash::~stash() {
if(storage) {
puts("freeing storage");
free(storage);
}
}
int stash::add(void* element) {
if(next >= quantity) // Enough space left?
inflate(100); // Add space for 100 elements
// Copy element into storage,
// starting at next empty space:
memcpy(&(storage[next * size]),
element, size);
next++;
return(next - 1); // Index number
}
void* stash::fetch(int index) {
if(index >= next || index < 0)
return 0; // Not out of bounds?
// Produce pointer to desired element:
return &(storage[index * size]);
}
int stash::count() {
return next; // Number of elements in stash
}
void stash::inflate(int increase) {
void* v =
realloc(storage, (quantity+increase)*size);
assert(v); // Was it successful?
storage = (unsigned char*)v;
quantity += increase;
}