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by: ik |
last post by:
Hello all,
Under C++ when 'extern' is used with out the string literal "C" does
it act the same as a 'static' ? When is it appropriate using 'extern' ?
Thanks
~Ik
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by: John Ratliff |
last post by:
I have a few global variables in my app. They are defined in the main
application class file and declared (extern) in a header which can be
included by anyone who would want to use these variables.
Two of the globals are pointers which are initialized at runtime. The others
are classes whose values are initialized in the global space. When I had
just the pointers, I didn't need to include the extern header in the
defining class file. But...
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by: Mark A. Gibbs |
last post by:
I have a question about mixing C and C++.
In a C++ translation unit, I want to define a function with internal
linkage and C calling convention. Here's a sample of what I want to do:
// main.cpp
// This is defined in a C module
extern "C" void fake_qsort(void*, std::size_t, std::size_t,
int (*compare)(const void*, const void*));
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by: tweak |
last post by:
What's the best way to use extern when using multiplefiles that is
easiest to maintain?
Is it best to declare:
extern int a;
in a header file and include the header file in all files except
where it's defined.
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by: G Patel |
last post by:
I've seen some code with extern modifiers in front of variables
declared inside blocks. Are these purely definitions (no definition)
or are they definitions with static duration but external linkage?
Not much on this in the FAQ or tutorials.
|
| |
by: ccwork |
last post by:
Hi all,
I am reading "C: A Reference Manual" 4th ed and I get lost for the
"extern". It says that global object without specifying the
storage-class specifier will have "extern" as the default storage-class
specifier. My (little) C experience tells me that an object with
"extern" is to let the linker knows that the object is referencing the
object defined in somewhere, and this "somewhere" object does not have
the storage-class specifier...
|
by: siliconwafer |
last post by:
Hi all,
I wanted to know that is use of extern keyword mandatory in case of
global variables and functions used in other source files?
i.e consider a following piece of code from MSDN explaining extern
storage class:
/******************************************************************
SOURCE FILE ONE
*******************************************************************/
extern int i; /* Reference to i, defined below */
|
by: Tapeesh |
last post by:
I would like to know what is the expected behaviour of C compilers when
an extern decleration is intialized.
When the following code is compiled using gcc
//File extern.c
int arr ;
int a ;
|
by: Christian Christmann |
last post by:
Hi,
I've tree questions on the storage class specifier "extern":
1) Code example:
int main( void )
{
int b = -2; // my line 3
if ( a ) {
|
by: mimi |
last post by:
The programmer indicates to the compiler that a function is written
in a different programming language using a linkage directives.It is
intuitive that extern "SomeLanguage" is used to declare functions
written in the "SomeLanguage".
But I am quite confused what information does the linkage directive
tells the compiler.The "generated" function name? The way the
arguments are ordered?Or something else?
And I am still wondering why extern...
|
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: 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...
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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: 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 the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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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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