473,570 Members | 2,888 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Heap, stack, pile?

Someone at work asked me this question:

Value types--do they hit the heap or the pile? Well, I was a bit
dumbfounded, because I never heard of the term "pile". I've heard of
heap and stack, but what is a pile? Is it just another name for
stack? Doing some reading, I found that value types use stack memory
since the size can be determined at compile time and there's less
overhead with this type of memory. So, I'm thinking this is just
another name for stack. I couldn't find "pile" defined in
webopaedia.com.

Comments appreciated.

Thanks in advance!
Nov 16 '05 #1
4 3340
Robbie,

I've never heard of pile, but I would assume that it means "stack".

With value types, if you declare them in a method, then they are on the
stack. If they are fields in a class, then those are on the heap, because
the instance of the class itself is on the heap.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"Robbie" <Ro************ @netscape.net> wrote in message
news:17******** *************** ***@posting.goo gle.com...
Someone at work asked me this question:

Value types--do they hit the heap or the pile? Well, I was a bit
dumbfounded, because I never heard of the term "pile". I've heard of
heap and stack, but what is a pile? Is it just another name for
stack? Doing some reading, I found that value types use stack memory
since the size can be determined at compile time and there's less
overhead with this type of memory. So, I'm thinking this is just
another name for stack. I couldn't find "pile" defined in
webopaedia.com.

Comments appreciated.

Thanks in advance!

Nov 16 '05 #2
Robbie <Ro************ @netscape.net> wrote:
Someone at work asked me this question:

Value types--do they hit the heap or the pile? Well, I was a bit
dumbfounded, because I never heard of the term "pile". I've heard of
heap and stack, but what is a pile? Is it just another name for
stack? Doing some reading, I found that value types use stack memory
since the size can be determined at compile time and there's less
overhead with this type of memory. So, I'm thinking this is just
another name for stack. I couldn't find "pile" defined in
webopaedia.com.


I haven't heard of "pile" either, to be honest.

Value types reside on the stack if they come from:
o Local variables
o Intermediate expressions (i.e. evaluation on the stack)
o Instance variables where the enclosing value is also on the stack

See http://www.pobox.com/~skeet/csharp/memory.html for more
information.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Nov 16 '05 #3
In other words if the value type is part of the state of a reference type it gets allocated on the managed pile ... sorry heap ... inline with the rest of that object's state.

e.g.

struct Point

{

int x;

int y;

}

class Line

{

Point start;

Point end;

}

The memorry for the Point instances will be allocated on the managed heap when a line instance is created.

Regards

Richard Blewett - DevelopMentor

http://staff.develop.com/richardb/weblog

nntp://news.microsoft. com/microsoft.publi c.dotnet.langua ges.csharp/<MP************ ************@ms news.microsoft. com>

Robbie <Ro************ @netscape.net> wrote:
Someone at work asked me this question:

Value types--do they hit the heap or the pile? Well, I was a bit
dumbfounded, because I never heard of the term "pile". I've heard of
heap and stack, but what is a pile? Is it just another name for
stack? Doing some reading, I found that value types use stack memory
since the size can be determined at compile time and there's less
overhead with this type of memory. So, I'm thinking this is just
another name for stack. I couldn't find "pile" defined in
webopaedia.com.


I haven't heard of "pile" either, to be honest.

Value types reside on the stack if they come from:
o Local variables
o Intermediate expressions (i.e. evaluation on the stack)
o Instance variables where the enclosing value is also on the stack

See http://www.pobox.com/~skeet/csharp/memory.html for more
information.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

---
Incoming mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.760 / Virus Database: 509 - Release Date: 10/09/2004

[microsoft.publi c.dotnet.langua ges.csharp]
Nov 16 '05 #4
Richard Blewett [DevelopMentor] <ri******@devel op.com> wrote:
In other words if the value type is part of the state of a reference
type it gets allocated on the managed pile ... sorry heap ... inline
with the rest of that object's state.


Exactly. This is why I disagree when people just say "Reference types
are allocated on the heap. Value types are allocated on the stack" and
leave it at that.

I must get round to writing my "definitive guide to reference vs value
types" some time :)

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Nov 16 '05 #5

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

14
30075
by: Kevin Grigorenko | last post by:
Hello, I couldn't find an obvious answer to this in the FAQ. My basic question, is: Is there any difference in allocating on the heap versus the stack? If heap or stack implementation is not part of the standard, then just disregard this question. Here's some questions I'm confused about, and if you can add anything else, please do so! ...
17
5012
by: Jonas Rundberg | last post by:
Hi I just started with c++ and I'm a little bit confused where stuff go... Assume we have a class: class test { private: int arr; };
1
3759
by: Geiregat Jonas | last post by:
I'm reading Eric Gunnerson's book. He is talking about the heap and stack, he says you have 2types, value wich are in the stack or inline or reference types wich are in the heap. I don't get this what's heap stack and what's the main difference between those 2types ?
2
2847
by: Nick McCamy | last post by:
I have a question related to allocating on the stack. In this program below, are my following assumptions true? - variable a is allocated on the heap since it's static - variable b is allocated on the stack since it's a value type variable - variable d is allocated on the stack since it's a value type variable Where does variable "c"...
9
3364
by: shine | last post by:
what is the difference between a heap and a stack?
2
3077
by: Ganesh | last post by:
I am not sure if this question is relevant here. Why is 'heap' (the place where dynamic memory allocation occurs) called so? There is also a data structure called 'heap'. What is the connection? Ganesh
24
2846
by: arcticool | last post by:
I had an interview today and I got destroyed :( The question was why have a stack and a heap? I could answer all the practical stuff like value types live on the stack, enums are on the stack, as are structs, where classes are on the heap... when value types go out of scope the memory is re- allocated, object remain in memory waiting to be...
16
4431
by: sarathy | last post by:
Hi all, I need a few clarifications regarding memory allocaion in C++. I apologize for the lengthy explanation. 1. In C++, Objects are allocated in heap. What does heap refer to? Is it an area in RAM/Memory or does it refer to a data structure being used for storing objects. 2. In C++, functions and its local variables go in stack. If...
53
26345
by: fdmfdmfdm | last post by:
This is an interview question and I gave out my answer here, could you please check for me? Q. What are the memory allocation for static variable in a function, an automatic variable and global variable? My answer: static variable in function and global variable are allocated in head, and automatic variable is allocated in stack. Right?
0
7944
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. ...
0
8149
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that...
1
7699
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For...
0
8000
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the...
0
6323
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then...
1
5523
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes...
0
5247
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert...
0
3681
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in...
1
2131
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.