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by: Bryan Parkoff |
last post by:
….I would like to know which is the best optimization to use global
variable or global struct. I always tell C/C++ Compiler to turn on
optimization.
….I use underscore between first name and second name for better
readable. After optimization, global variables might be misaligned
because each global variables must be converted to 32 bits, but I do
see that C/C++ Compiler do padding between variables. Struct does the
same to do padding....
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by: Bhalchandra Thatte |
last post by:
I am allocating a block of memory using malloc.
I want to use it to store a "header" structure
followed by structs in my application. How to calculate
the alignment without making any assumption
about the most restrictive type on my machine?
Thanks.
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by: S.Tobias |
last post by:
I would like to check if I understand the following excerpt correctly:
6.2.5#26 (Types):
All pointers to structure types shall have the same representation and
alignment requirements as each other. All pointers to union types shall
have the same representation and alignment requirements as each other.
Does it mean that *all* structure (or union) types have the same
alignment?
Eg. type
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by: Jim Ward |
last post by:
After we installed the latest Solaris patch,
109147-37, the following code fails with an
EFAULT error (14);
int main(int argc, char* argv)
{
struct sockaddr_in sockaddr;
/* code snipped */
child_sock = accept(serv_sock, (struct sockaddr*) &sockaddr, &addr_size);
/* code snipped */
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by: gamja |
last post by:
Hi all.
I know that some padding bits are inserted between data members of a
structure. Is this rule also applied for the variables on local stack
or global??? For example, in following code dumps...
------------
struct foo foo1;
....
struct bar bar1;
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by: Hendrik Schober |
last post by:
Hi,
we just run into the problem, that "default" alignment
in the project properies dialog seem to be different.
We have a project that's a DLL, which is linked with
a couple of LIBs. All are with the same solution. All
had "Default" set in the "Struct Member Alignment"
entry.
After some assembler debugging we found out that a
struct member that is a member function pointer in
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by: Bill Pursell |
last post by:
I have a program that does most of its work traversing
a bunch of lists. The lists contain a void *, and I spent
some time today replacing the void *'s with a copy
of the data at the end of the structure as a zero length
array. The performance improvement that resulted by
avoiding the need to dereference the ptr was substantial,
but it has left me with an uncertain feeling. In particular,
changing an assignment caused the output to...
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by: haomiao |
last post by:
I want to implement a common list that can cantain any type of data,
so I declare the list as (briefly)
---------------------------------------
struct list
{
int data_size;
int node_num;
char nodes; //will be list_node1,list_node2...
};
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by: Chris Thomasson |
last post by:
Here is some info on a C++ allocator prototype I am working on:
http://groups.google.com/group/comp.lang.c++/browse_frm/thread/beeee1f61fdbb52c
Any tried-and-true techniques for calculating the correct alignment of any
C++ type the user can throw at it? For the initial code, I was assuming that
the alignment(T) == sizeof(T)... Now that I am so close to being able to
release this thing, I wanted to be able to stitch up this loose end.
...
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by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
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by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
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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.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
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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 captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
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 most users, this new feature is actually very convenient. If you want to control the update process,...
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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 choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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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 launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
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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 instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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